Color film structure, preparation method and display device

Abstract

The present disclosure provides a color filter structure, a method for preparing it, and a display device. The color filter structure includes: a substrate; a color filter layer comprising a plurality of color resist blocks and a black matrix positioned between the color resist blocks; and an organic prism layer comprising a plurality of prism structures. The orthographic projections of the prism structures on the substrate overlap with the orthographic projections of the color resist blocks on the substrate, and the degree of polymerization of the prism structures is greater than that of portions of the organic prism layer where the prism structures are not positioned. This reduces the reflectivity of ambient light on the surface of the color filter structure, and enhances the contrast of a display device utilizing the color filter structure through the prism structures.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a color film structure, a preparation method, and a display device. Background Art

[0002] With the continuous development of display technology, the production process and color filter structure of color filters, or color filters (CF), are no longer just an important component of liquid crystal display devices (LCD). Organic light-emitting display devices (OLED), such as W-OLED with white sub-pixels and Pol-less-OLED without polarizer design, also widely use color filter structures to improve display effects. However, compared with the strategy of using blank glass plates and other materials as substrates, the addition of color filter structures reduces the anti-reflection ability of the product to a certain extent: the addition of black matrix materials in the color filter structure makes it difficult to match the refractive index of the material forming the black matrix with that of silicate glass, resulting in the diffusion of reflections after secondary refraction, and a certain degree of improvement in the surface reflectivity of the product. In addition, contrast, as one of the important parameters for evaluating the grade of display products, also needs to be improved.

[0003] Specifically, taking LCD products as an example, due to the characteristics of liquid crystal molecules, LCD products have a minimum brightness shortcoming, and the black blocks are not dark enough, resulting in low product contrast; while OLED organic light-emitting products have a shortcoming in maximum brightness due to low light extraction rate and poor light utilization rate, and the contrast also needs to be improved.

[0004] Therefore, the current color film structure, preparation method and display device still need to be improved. Summary of the Invention

[0005] The embodiments of the present disclosure provide a color film structure, a preparation method, and a display device to solve or alleviate one or more technical problems in related technologies.

[0006] As a first aspect of an embodiment of the present disclosure, a color filter structure is provided. The color filter structure includes: a substrate; a color filter layer, the color filter layer including a plurality of color resist blocks and a black matrix positioned between the color resist blocks; and an organic prism layer, the organic prism layer including a plurality of prism structures, wherein the orthographic projections of the prism structures on the substrate overlap with the orthographic projections of the color resist blocks on the substrate, and the degree of polymerization of the prism structures is greater than the degree of polymerization of portions of the organic prism layer where the prism structures are not positioned.

[0007] In one embodiment, the organic prism layer is located between the substrate and the color filter layer, and the prism structure includes a first prism unit and a second prism unit. The first prism unit is located on the surface of one side of the substrate, and the orthographic projection of the first prism unit on the substrate is located within the orthographic projection range of the color resist block on the substrate. The second prism unit is located on the side of the organic prism layer facing the color filter layer, the second prism unit is in contact with the black matrix, and the orthographic projection of the second prism unit on the substrate is located within the orthographic projection range of the black matrix on the substrate.

[0008] In one embodiment, the organic prism layer is located on a side of the color filter layer away from the substrate, and a filling structure is provided between two adjacent prism structures.

[0009] In one embodiment, the prism structure has a photosensitive agent therein, and the photosensitive agent includes a light receiving unit and a light energy conversion unit.

[0010] In one embodiment, the light receiving unit contains a carbazole group, the light receiving unit is connected to a plurality of the light energy conversion units, the light energy conversion unit precursor releases free radicals and / or negative ion groups under light conditions, the free radicals and / or negative ion groups are polymerized to form the prism structure, and the light energy conversion unit precursor contains a compound shown in (Formula I):

[0011]

[0012] wherein n is 1, 2 or 3, and R2 is selected from H, -CH3, -CH2CH3, -CH2CH2CH3, -C(CH3)3 and -O(CH2) m At least one of -OH, m is an integer from 1 to 4, R1 is -C(CH3)2OH, (Formula II) or (Formula III) shown:

[0013]

[0014] In one embodiment, the refractive index of the prism structure is configured to satisfy at least one of the following conditions: reducing the amount of light emitted from the corresponding part of one color resist block and emitted from another color resist block adjacent thereto; and reducing the amount of light emitted from around the black matrix in the off state.

[0015] As a second aspect of the present disclosure, a method for preparing the aforementioned color filter structure is provided. The method comprises: providing a color filter structure prefabricated plate, the color filter structure prefabricated plate comprising a substrate, a black matrix for forming a color filter layer, at least one color resist layer, and an organic layer for forming an organic prism layer; performing an exposure process on the color filter structure prefabricated plate to form a plurality of color resist blocks based on the color resist layer, the plurality of color resist blocks being separated by the black matrix; and forming a plurality of prismatic structures based on the organic layer, wherein the orthographic projections of the prismatic structures on the substrate and the orthographic projections of the color resist blocks on the substrate have overlapping regions.

[0016] In one embodiment, the method includes: forming the organic layer on the substrate; forming a black matrix material on a side of the organic layer away from the substrate, and performing a first exposure and development process to synchronously form the black matrix and the second prism unit; forming a color resist layer in the gap between the black matrices, and performing a second exposure and development process to synchronously form the color resist block and part of the first prism unit; repeating the steps of forming the color resist layer and the second exposure and development process multiple times to form a plurality of the color resist blocks and the first prism unit, and the colors of the plurality of the color resist blocks are different.

[0017] In one embodiment, the method includes: forming a black matrix and a plurality of color resist blocks on the substrate, wherein the colors of the plurality of color resist blocks are different; forming the organic layer on a side of the black matrix and the plurality of color resist blocks away from the substrate to obtain the color filter structure prefabricated board; performing an exposure and development process on the color filter structure prefabricated board using the same mask plate as that used to form the color resist blocks to obtain the prism structure; and performing a thermal failure treatment on the color filter structure prefabricated board that has undergone the exposure and development process.

[0018] As a third aspect of the present disclosure, a display device is provided, which includes a display panel and the aforementioned color filter structure, wherein the color filter structure is located on the light-emitting side of the display panel.

[0019] In one embodiment, the display device is a liquid crystal display device, the display panel includes an array substrate, the color filter structure is an opposite substrate, and the display device further includes a liquid crystal cell sandwiched between the opposite substrate and the array substrate; or

[0020] The display device is an organic light-emitting display device, the display panel includes an organic light-emitting element located on a panel substrate, and the color filter structure is located on the light-emitting side of the organic light-emitting element.

[0021] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present disclosure will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0023] Figure 1 is a schematic structural diagram of a color filter structure according to an embodiment of the present disclosure;

[0024] Figure 2 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

[0025] Figure 3 is a schematic structural diagram of a color filter structure according to an embodiment of the present disclosure;

[0026] Figure 4 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

[0027] Figure 5 Schematic diagram of a method for preparing a color film structure according to one embodiment of the present disclosure;

[0028] Figure 6 Schematic diagram of a method for preparing a color film structure according to another embodiment of the present disclosure;

[0029] Figure 7 A photosensitizer precursor according to one embodiment of the present disclosure;

[0030] Figure 8 The structure of a photosensitive agent precursor after partial failure according to one embodiment of the present disclosure;

[0031] Figure 9 The structure of a photosensitive agent precursor after partial failure according to one embodiment of the present disclosure;

[0032] Figure 10 The structure of a photosensitive agent precursor after partial failure according to one embodiment of the present disclosure;

[0033] Figure 11 This is a structure after the photosensitive agent precursor according to one embodiment of the present disclosure is completely invalidated;

[0034] Figure 12The failure conditions of different bridge chains of the photosensitive agent precursor at different temperatures according to one embodiment of the present disclosure are shown;

[0035] Figure 13 The failure conditions of the photosensitive agent precursor according to one embodiment of the present disclosure at different temperatures are shown;

[0036] Figure 14 FIG. 4 is a scanning electron microscope photograph of a prism structure according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] In the following, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure, and different embodiments may be combined in any manner without conflict. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0038] As a first aspect of the embodiment of the present disclosure, the present disclosure provides a color filter structure. Figure 1 The color filter structure includes a substrate 100, a color filter layer 300, and an organic prism layer 200. The color filter layer includes a plurality of color resist blocks (320A-320C) and a black matrix (BM) 310 located between the color resist blocks. The organic prism layer has a plurality of prism structures 230. The orthographic projections of the prism structures on the substrate overlap with the orthographic projections of the color resist blocks on the substrate, and the degree of polymerization of the prism structures is greater than the degree of polymerization of the organic prism layer where the prism structures are not provided. This reduces the reflectivity of ambient light on the surface of the color filter structure, and improves the contrast of a display device utilizing the color filter structure through the prism structures.

[0039] In the present disclosure, the term "degree of polymerization" refers to the number of repeating units contained in the prism structure, which is greater than the number of polymer repeating units in other areas of the organic prism layer. In other words, the prism structure has a higher degree of polymerization. In addition, the term "degree of polymerization" should be understood in a broad sense. When the material where the prism structure is not provided in the organic prism layer is different from the material used in the prism structure, the prism structure also has a higher number of repeating units. In this case, the repeating units of the two may be different. The inventors have found that polymers with a higher degree of polymerization can have a higher refractive index, hardness and density. Therefore, when used in a prism structure, the optimization effect of the prism structure on the light path can be improved. In addition, since the organic prism layer as a whole can be formed of organic materials, the color film structure using the organic prism layer can have a better ability to reduce ambient light reflection.

[0040] In some embodiments, the organic prism layer and the color filter layer are formed using the same mask, or the organic prism layer and the color filter layer are formed simultaneously. The prism structure and the color filter layer of this color filter structure are formed using the same mask. Therefore, the structure of the prism structure can be controlled based on the structure of the color filter layer, thereby integrating the prism structure and the color filter filter. This reduces ambient light reflection from the surface of the color filter structure and improves the contrast of a display device utilizing this color filter structure.

[0041] For ease of understanding, the following briefly explains the principle by which the color filter structure can achieve the above-mentioned beneficial effects:

[0042] As previously mentioned, the black matrix material in color filter structures struggles to match the refractive index of the glass to minimize ambient light reflection. Since the reflectivity of an object's surface is related to the refractive index of the interface between the two light transmission paths, it's difficult to achieve this through material design between the black matrix and the glass surface in color filter structures. Consequently, an external anti-reflection coating is required, increasing the production cost of display devices using color filter structures. Furthermore, since contrast is also a key parameter for measuring display panel quality, OLED and other display panel products have adopted a strategy of using specific polarizers to enhance the contrast of color filter displays. Adding polarizers with mutually perpendicular polarization directions can improve contrast. However, this strategy requires additional polarizers, resulting in increased product thickness and production costs. Furthermore, because LCD and OLED products differ in their contrast enhancement strategies, LCDs have limitations in minimum brightness, while OLEDs have limitations in maximum brightness. Consequently, a variety of color filter structures must be developed for different products, significantly increasing production costs. A color filter structure with a controllable structure and integrated prisms could significantly alleviate or even resolve these technical issues. Specifically, the color filter structure described above is provided with an organic prism layer. Compared to the black matrix material, the refractive index of the organic prism layer can better match that of the substrate and other media, thereby alleviating the problem of the color filter structure's high reflectivity to ambient light. Furthermore, the provision of the organic prism layer allows the prism structure to be formed simultaneously with the color filter layer. The color filter layer and prism structure can be adjusted based on different products (LCD or OLED products), thereby improving the contrast of display devices utilizing this color filter structure.

[0043] Specifically, the refractive index of the prism structure is configured to reduce the amount of light emitted from a corresponding portion of one color filter block that exits from another adjacent color filter block, and / or to reduce the amount of light emitted from around the black matrix in the off state. This can improve the light extraction efficiency and peak brightness of a display device utilizing this color filter structure; alternatively, it can prevent light leakage in the off state, resulting in a lower dark-state brightness.

[0044] It is important to note that in this disclosure, the terms "off state" and / or "dark state" refer to a closed state of the liquid crystal light valve. This refers to a state in which a sub-pixel or a pixel unit is in a state where the majority of light emitted by the backlight unit in that area is prevented from being emitted by controlling the deflection of liquid crystal molecules.

[0045] The aforementioned control of the refractive index of the prismatic structure can be achieved by adjusting the composition of the organic material forming the prismatic structure. For example, in one embodiment of the present disclosure, the prismatic structure can be formed by free radical polymerization or ionic polymerization. By adjusting the ions involved in the free radical polymerization or ionic polymerization, the refractive index of the formed prismatic structure can be controlled to match the refractive index of the substrate material, thereby reducing the reflection of ambient light.

[0046] In some embodiments, the prismatic structure contains a photosensitizer. Under conditions such as ultraviolet light, the photosensitizer precursor can release free radicals or negative ion groups that polymerize to form the prismatic structure. The organic layer forming the prismatic structure may also include other free radical groups and initiators for polymerization. After the free radicals or negative ion groups are released, polymerization occurs at predetermined locations to form the prismatic structure. Thus, the location where polymerization occurs can be controlled by illumination, thereby enabling control of conditions such as the position and morphology of the prismatic structure. Thus, by simply designing an organic layer material with a specific composition, different prismatic structures can be formed depending on the illumination conditions. In some embodiments, the formation of the prismatic structure can be synchronized with the exposure of structures such as the black matrix and color resist blocks of the color filter layer. During the formation of the black matrix and color resist blocks, exposure and development operations are required to simultaneously form the prismatic structure. Thus, the prismatic structure can be adjusted accordingly based on the specific structure of the color filter layer, adapting it to different display products to achieve improved contrast and display quality.

[0047] Specifically, in some embodiments, the photosensitive agent may include a light receiving unit and a light energy conversion unit. The photosensitive agent precursor includes a light receiving unit and a light energy conversion unit precursor. The light energy conversion unit precursor has a releasable free radical or negative ion group. When exposed to light, the light receiving unit can transfer light energy to the light energy conversion unit precursor to achieve the release of free radicals or negative ion groups, thereby completing the aforementioned polymerization process to form a prism structure. The refractive index and density of the prism structure after polymerization are increased, so that it can achieve matching with the refractive index of the surrounding light medium and reduce the effect of ambient light reflection. In addition, the increase in the refractive index can also adjust the light path in conjunction with the shape of the prism unit to increase the contrast.

[0048] In one embodiment, the light receiving unit contains a carbazole group. The inventors have found that carbazole compounds have good light signal receiving capabilities. For example, the light receiving unit may have at least one of the structures shown in the following formula:

[0049]

[0050] The compounds represented by formula IV, V, and VI all have a carbazole group and good light energy receiving function, and can quickly achieve energy transfer.

[0051] In some embodiments, the photo-energy conversion unit precursor may contain a compound represented by (Formula I):

[0052]

[0053] wherein n is 1, 2 or 3, and R2 is selected from H, -CH3, -CH2CH3, -CH2CH2CH3, -C(CH3)3 and -O(CH2) m At least one of -OH, m is an integer from 1 to 4, R1 is -C(CH3)2OH, (Formula II) or (Formula III) shown:

[0054]

[0055] The inventors have discovered that the photoconversion unit having the above structure has good energy conversion capability and can quickly release the free radicals or negative ion groups connected thereto.

[0056] For example, according to some specific embodiments of the present invention, the photoenergy conversion unit precursor may include at least one of the following structures:

[0057]

[0058] In the present disclosure, the structure of the photoenergy conversion unit before releasing free radicals and / or negative ion groups is the precursor of the photoenergy conversion unit. Similarly, the structure of the photosensitive agent before releasing free radicals and / or negative ion groups for polymerizing to form a prism structure is the precursor of the photosensitive agent. In the present disclosure, the free radicals and / or negative ion groups for polymerizing to form a prism structure are not particularly limited, and can be free radicals or released ion groups obtained by the splitting of the aforementioned photoenergy conversion unit precursor after absorbing light energy. For example, the released free radicals may include at least one of the following formulas:

[0059]

[0060] Wherein, R shown in formula (5) can be a saturated or unsaturated carbon chain, for example, a saturated or unsaturated group of C1-C5. The long chain connected to the R group in formula (5) represents a saturated or unsaturated carbon chain with 10 or more carbon atoms. The specific number of carbon atoms contained is not particularly limited and can be selected by those skilled in the art according to actual conditions.

[0061] In order to adapt to different display products, such as the aforementioned LCD and OLED panels, the solutions for improving the contrast of the above two panels are different. Therefore, in some embodiments of the present disclosure, the light receiving unit can be connected to multiple light energy conversion units. In other words, the light receiving unit can be connected to multiple light energy conversion unit precursors. As a result, free radicals and / or ionic groups can be released in segments under light conditions, thereby achieving segmented and positional polymerization, and then forming a prism structure at different positions according to needs, and then adjusting the light output of the display panel using the color film structure to achieve the purpose of improving the contrast.

[0062] In one embodiment, reference Figure 1 , the organic prism layer 200 is located between the substrate 100 and the color filter layer 300. The color filter layer 300 includes a black matrix 310 and a plurality of color resist blocks, such as the color resist blocks 320A-320C shown in the figure. Different color resist blocks may have different colors, such as RGB shown in the figure. It should be noted here that the color, arrangement and shape of the color resist blocks are not particularly limited, and those skilled in the art can design them according to the pixel arrangement of the display panel. For example, the color resist blocks 320A-320C may correspond to multiple sub-pixel areas and together constitute a pixel unit to display the picture. Multiple pixel units can be arranged in an array on the substrate.

[0063] The prism structure 230 includes a first prism unit 210 and a second prism unit 220. The first prism unit 210 is located on the surface of one side of the substrate 100, and the orthographic projection of the first prism unit 210 on the substrate 100 is located within the orthographic projection range of the color block on the substrate 100. For example, each color block may correspond to a first prism unit 210 ( Figure 1 The entire area of ​​the R and B color blocks, as well as the first prism units corresponding to the R and B color blocks, are not shown. The second prism unit 220 can be located on the side of the organic prism layer 200 facing the color filter layer 300. The second prism unit 220 is in contact with the black matrix 310, and the orthographic projection of the second prism unit 220 on the substrate is within the orthographic projection of the black matrix 310 on the substrate. In other words, the second prism unit 220 is located at a position corresponding to the black matrix 310.

[0064] In this embodiment, the first prism unit 210 can play the role of converging the outgoing light, preventing the light emitted by the sub-pixel corresponding to a certain color block (such as 320B) from being emitted from other connected color blocks (such as 320A or 320C), thereby preventing color mixing and improving the brightness of the light emitted by a single sub-pixel. The second prism unit 220 can block the light emitted near the black matrix 310. In other words, the second prism unit 220 can block the light leakage between the liquid crystal deflection angle and the pixel gap, improve the minimum brightness shortcoming of the LCD display panel, and thus improve the contrast of the LCD display panel.

[0065] In one embodiment, the organic prism layer is formed synchronously with the color filter layer, and the second prism unit 220 can be formed synchronously when the black matrix 310 is formed: when forming the black matrix 310, the black matrix material needs to be exposed and developed. During the exposure and development, although the black matrix material has a low transmittance and light energy cannot directly penetrate the black matrix material to reach the position of the organic prism layer, the black matrix material has good heat absorption performance, and energy can be conducted to the organic prism layer at the position where the black matrix 310 needs to be formed through thermal radiation. As a result, the photosensitive agent at this position can undergo the aforementioned free radical and / or ion group release process, and then polymerization occurs at this position to form the second prism unit 220. Similarly, when forming multiple color resist blocks, the light used to expose and develop the color resist block material can penetrate the color resist material and be incident on the organic prism layer, so that the aforementioned first prism unit 210 can be formed at the corresponding position of the organic prism layer and the color resist block.

[0066] In one embodiment, the material forming the organic prism layer may further contain an additive for cross-linking with the substrate 100. For example, the material may contain an additive capable of cross-linking with silicate glass and hydroxide, and the additive may include but is not limited to the following formulas (8) and (9):

[0067]

[0068] Similarly, R shown in formula (8) and formula (9) can be a saturated or unsaturated carbon chain, for example, a saturated or unsaturated group containing C1-C5. The broken line portion connected to the R group represents a saturated or unsaturated carbon chain containing 2-10 carbon atoms. The specific number of carbon atoms contained is not particularly limited and can be selected by those skilled in the art according to actual circumstances.

[0069] Thus, by adding additives, the polymerization reaction can be controlled to start on the substrate side during the formation of the first prism unit, thereby forming the first prism unit with a trapezoidal cross-section shown in the figure. Because the second prism unit is polymerized by thermal radiation from the black matrix, the second prism unit is only formed at the location in contact with the black matrix. As the depth extends toward the substrate side, the energy received by the photosensitive agent is attenuated, so the second prism unit can form an inverted trapezoidal structure.

[0070] In one embodiment, reference Figure 3 , the color film structure may also have a structure suitable for OLED panels. Specifically, the organic prism layer 200 is located on the side of the color film layer 300 away from the substrate 100, and a filling structure is provided between the two adjacent prism structures. When the color film structure is applied to the OLED panel, the prism structure may be directed toward the side of the organic light-emitting element. Similarly, the prism unit 230 in the color film mechanism may also be formed using the same mask plate when forming the color block of the color film layer. Since the contrast shortcoming of the OLED panel is caused by the highest brightness, the color film structure in this embodiment may not have the aforementioned second prism unit, and may be composed of Figure 3 The prism structure shown in the figure prevents crosstalk between adjacent pixels and improves the light output rate of sub-pixels. As mentioned above, the refractive index of the prism structure after polymerization can be improved to a certain extent, so it can play a role in fixing and optimizing the light path. That is, the prism structure can alleviate or prevent the light incident on the prism structure from being dispersed into other adjacent prism structures through processes such as refraction. As a result, the light output rate of the sub-pixels at the prism structure can be improved, thereby increasing the brightness of the OLED panel at high brightness and improving the contrast of the display panel.

[0071] In some embodiments, a filling structure 240 may be provided between adjacent prism structures. The filling structure may be formed by thermally degrading the material forming the organic prism layer. Alternatively, the organic prism layer material between the prism structures may be removed and filled with a component including, but not limited to, optical adhesive (OC). This allows the organic prism layer to have a smooth surface.

[0072] As a second aspect of the present disclosure, a method for preparing the color film structure described above is proposed. The method comprises: providing a color film structure prefabricated plate, and performing an exposure process on the color film structure prefabricated plate, and forming a color film layer and a prism structure using the same mask plate. Specifically, the color film structure prefabricated plate includes a substrate, a black matrix for forming a color film layer, and at least one color resist layer, and an organic layer for forming an organic prism layer. The color resist layer can be used to form a plurality of color resist blocks in subsequent steps, and the plurality of color resist blocks are separated by a black matrix. There is an overlapping area between the orthographic projection of the prism structure on the substrate and the orthographic projection of the color resist block on the substrate. The color film structure obtained by this method can have all the characteristics and advantages of the aforementioned color film structure, which will not be repeated here.

[0073] In general, the prism structure of this method is formed of organic materials, and the same mask plate is used to form the prism structure and the color filter layer, so that the prism structure can have a structure that matches the color filter layer, thereby achieving functions such as improving contrast and reducing surface reflection.

[0074] In one embodiment, reference Figure 5 The color film structure prepared by the method may be a color film structure for an LCD display panel. Specifically, the method may include:

[0075] First, an organic layer is formed on the substrate 100. The organic layer may contain a photosensitive agent for forming a prism structure, the aforementioned additives, and other initiators, free radicals, and other components for polymerizing with free radicals and / or ionic groups released by the photosensitive agent precursor. Specifically, the photosensitive agent precursor may have the following components: Figure 7 The components shown in . The carbazole group (CZ) therein can be used as a light receiving unit. The light receiving unit can be connected to three photoenergy conversion unit precursors (Photo Absolute) shown in the above formula (I). Each photoenergy conversion precursor can release an R group free radical after being treated with light. The structure can release multiple free radicals in segments to polymerize to form the first and second prism units in the prism structure. The light receiving unit can be obtained by the following method:

[0076]

[0077] The reactants were refluxed in ethanol for 4 hours to obtain a yield of about 80%. Thus, the above-mentioned light receiving unit can be easily obtained, and the above-mentioned photosensitive agent precursor can be synthesized by a method familiar to those skilled in the art. Figure 7 Taking the photosensitizer precursor structure shown in as an example, the process of releasing free radicals in sections disclosed in the present invention is briefly described:

[0078] Figure 7The photosensitive agent precursor shown in the first stage can fail at 120 degrees Celsius when subjected to the first stage light treatment, releasing the first part of R radical free radicals, such as Figure 8 A shown in FIG fails; when receiving the second stage light treatment, the second stage light energy conversion precursor fails at 160 degrees Celsius, releasing the second part of the R radical free radical, such as Figure 9 The A+B shown in FIG fails; when receiving the third stage light treatment, the third stage light energy conversion precursor fails at 170 degrees Celsius, releasing the third part of R radicals, such as Figure 10 After all the light energy conversion precursors release free radicals, the part of the photosensitive agent precursor that loses free radicals can polymerize with other free radicals in the system, and the photosensitive agent precursor is completely ineffective, forming the following Figure 11 The structure shown in . Figure 12 The figure shows the mass percentage (ordinate) of failure of different bridge chains (photoenergy conversion unit precursors) in the photosensitive agent at different temperatures (abscissa). Figure 13 The graph shows the percentage of failure by mass (ordinate) of the entire photosensitive agent precursor at different temperatures (abscissa). This indicates that the photosensitive agent precursor has the ability to polymerize in sections to form a prismatic structure.

[0079] Furthermore, the inventors have discovered that the prism structure formed by the aforementioned photosensitive agent precursor can form a prism structure with a specific morphology during the free radical / ion polymerization stage. Figure 14 The prism structure formed by the polymerization process can have side walls with a certain angle, such as the undercut part shown by the circle in the figure. Normally, prisms formed by materials such as optical adhesive (OC) need to undergo local melt flow to form smooth side walls with prism functions. However, the photosensitive agent precursor can form prism side walls with a certain curve during the polymerization stage, realizing the aforementioned light path regulation function. Therefore, the prism structure formed by the photosensitive agent precursor also has the advantage of a simple preparation method.

[0080] refer to Figure 5 In (a) and (b), a black matrix material can be formed on the side of the organic layer 200' away from the substrate 100, and a first exposure and development process is performed to form a black matrix 310 and a second prism unit 220 using the same mask. Subsequently, a color resist layer is formed in the gaps between the black matrices 310, and a second exposure and development process is performed to form a color resist block 320A and a portion of the first prism unit using the same mask. The above steps are repeated multiple times ( Figure 5(d) and (e) in the figure) to form a plurality of color blocks and the first prism unit 210. Finally, an optical adhesive layer 600 may be formed on the side of the color filter layer 300 away from the substrate 100 to form a flat surface and protect the color blocks and the black matrix.

[0081] In some embodiments, the specific thicknesses of the organic layer 200', black matrix material, and color resist layer are not particularly limited. For example, the thickness of the organic layer 200' can be 2-4 microns, and the thickness of the black matrix material can be 1-2 microns. The thickness of each color resist layer can independently be 1.5-3 microns. The thickness of the optical adhesive layer can be 1.3-2.5 microns. This can meet the requirements of each layer structure and fully shape and solidify each layer structure through the exposure and development processes.

[0082] In some embodiments, each layer of material may be subjected to a corresponding cleaning operation, such as but not limited to grinding (Brush), stripping of the mask plate or stripping of the remaining material, etc., which will not be described in detail here. The exposure and development process may include exposure and heat treatment operations. The specific wavelength and dose of the ultraviolet light source used for exposure are not particularly limited, as long as it can be fully exposed to form. For example, the exposure wavelength for forming the black matrix may be 70-90 microns and the dose is 80-90mJ. The exposure wavelength for forming each color block may be 45-60 microns and the dose is 40-50mJ. The first and second prism units are formed synchronously with the color block and the black matrix respectively. After each exposure and development operation, a heat treatment (oven) operation may be performed to fully cure the relevant materials and allow the organic layer to fully release free radicals. The heat treatment temperature when forming the black matrix can be 110-130 degrees Celsius and the time can be 10-15 minutes. The heat treatment temperature for forming the color resist can be 130-150 degrees Celsius for 10-15 minutes for red color resist, 160-1700 degrees Celsius for 10-15 minutes for green color resist, and 160-180 degrees Celsius for 20-30 minutes for blue color resist. Furthermore, to further ensure sufficient thermal degradation of the organic layer, an additional heat treatment at 70-80 degrees Celsius for 10 minutes can be performed.

[0083] In one embodiment, the color filter structure obtained by this method can also be suitable for OLED panels. Figure 6 , the method may include: Figure 6 In step (a), a black matrix 310 and a plurality of color resist blocks (320A-320C) may be formed on a substrate 100, wherein the color of the color resist blocks is different. An organic layer 200' is formed on a side of the black matrix and the plurality of color resist blocks away from the substrate to obtain a color filter structure prefabricated board. Subsequently, referring to Figure 6In (b), the color film structure prefabricated plate can be exposed and developed using the mask plate (Mask) used when forming the color resist block to obtain the prism structure 230. The color film structure prefabricated plate that has been exposed and developed can then be subjected to a heat failure treatment to obtain the filling structure 240.

[0084] In this embodiment, the thickness of each film layer, exposure and development parameters, etc. can be the same or similar to the above embodiment, and will not be repeated here. In this way, a color filter structure suitable for improving the contrast and other parameters of the OLED panel can be easily obtained.

[0085] It should be noted here that the color filter structure proposed in the present disclosure, especially the example in which the prism structure is located on the side of the color filter layer away from the substrate, only serves as a support for the production of the color filter structure. In some embodiments, the color filter structure can be transferred from the substrate to other structures. In other embodiments, the substrate can also be a substrate for structures including but not limited to touch modules. The substrate of the color filter structure proposed in the present disclosure includes materials such as glass and PI, as long as it can support the relevant structures.

[0086] As a third aspect of the present disclosure, a display device is provided, which includes a display panel and the aforementioned color filter structure, wherein the color filter structure is located on the light-emitting side of the display panel.

[0087] In one embodiment, reference Figure 2 The display device may be a liquid crystal display device. The display panel includes an array substrate 500, which may include a second substrate 530, a common electrode 520, and pixel electrodes 510. The color filter structure may be integrated on the opposing substrate. The display device further includes a liquid crystal cell 400 sandwiched between the opposing substrate and the array substrate. The display device may further include a cover glass 1000.

[0088] In some other embodiments, the display device may be an organic light emitting display device. Figure 4 The display panel 700 may include a backplane circuit layer 730 and a plurality of organic light-emitting elements (720A-720C as shown in the figure) located on a panel substrate 740. The organic light-emitting elements may be separated by a pixel defining layer 710. The color filter structure is located on the light-emitting side of the organic light-emitting element, and each organic light-emitting element corresponds to a color resist block (320A-320C) and a prism structure 230. The substrate 100 of the color filter structure can serve as a protective layer. There is a filling structure 240 between adjacent prism structures 230. The filling structure 240 can be formed by heat failure treatment of the organic layer, or can also be formed of materials such as optical glue.

[0089] In the description of this specification, it should be understood that the terms "center", "thickness", "up", "down", "front", "back", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0091] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0092] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0093] The disclosure above provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, these are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0094] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this disclosure, and such modifications or substitutions should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A color film structure, characterized in that: include: substrate; A color filter layer, comprising a plurality of color resist blocks and a black matrix located between the color resist blocks; an organic prism layer, wherein the organic prism layer has a plurality of prism structures, wherein the orthographic projections of the prism structures on the substrate and the orthographic projections of the color resist blocks on the substrate have overlapping areas, The polymerization degree of the prism structure is greater than the polymerization degree of a portion of the organic prism layer where the prism structure is not provided; The prism structure includes a first prism unit and a second prism unit, the first prism unit is located on a surface of one side of the substrate, and an orthographic projection of the first prism unit on the substrate is within a range of an orthographic projection of the color resist block on the substrate; The second prism unit is located on a side of the organic prism layer facing the color filter layer, the second prism unit is in contact with the black matrix, and the orthographic projection of the second prism unit on the substrate is within the orthographic projection range of the black matrix on the substrate.

2. The color film structure according to claim 1, characterized in that: The organic prism layer is located between the substrate and the color filter layer.

3. The color film structure according to claim 1, characterized in that: The organic prism layer is located on a side of the color filter layer away from the substrate, and a filling structure is provided between two adjacent prism structures.

4. The color film structure according to claim 2 or 3, characterized in that: The prism structure has a photosensitizer therein, and the photosensitizer includes a light receiving unit and a light energy conversion unit.

5. The color film structure according to claim 4, characterized in that: The light receiving unit contains a carbazole group, and the light receiving unit is connected to a plurality of the light energy conversion units. The light energy conversion unit precursor releases free radicals and / or negative ion groups under light conditions, and the free radicals and / or negative ion groups polymerize to form the prism structure. The photoenergy conversion unit precursor contains a compound represented by Formula I: wherein n is 1, 2 or 3, and R2 is selected from H, -CH3, -CH2CH3, -CH2CH2CH3, -C(CH3)3 and -O(CH2) m -OH, m is an integer from 1 to 4, R1 is -C(CH3)2OH, and is represented by Formula II or Formula III:

6. The color film structure according to claim 1, characterized in that: The refractive index of the prism structure is configured to satisfy at least one of the following conditions: reducing the amount of light emitted from a corresponding portion of one color block and emitted from another adjacent color block; and The amount of light emitted from around the black matrix in the off state is reduced.

7. A method for preparing the color film structure according to any one of claims 1 to 6, characterized in that: include: A color filter structure prefabricated plate is provided, wherein the color filter structure prefabricated plate includes a substrate, a black matrix for forming a color filter layer and at least one color resist layer, and an organic layer for forming an organic prism layer; performing an exposure process on the color filter structure prefabricated plate to form a plurality of color resist blocks based on the color resist layer, wherein the plurality of color resist blocks are separated by the black matrix, and forming a plurality of prism structures based on the organic layer, wherein orthographic projections of the prism structures on the substrate and orthographic projections of the color resist blocks on the substrate have overlapping areas; forming the organic layer on the substrate; forming a black matrix material on a side of the organic layer away from the substrate, and performing a first exposure and development process to simultaneously form the black matrix and the second prism unit; forming a color resist layer at the gaps between the black matrices, and performing a second exposure and development process to simultaneously form the color resist blocks and a portion of the first prism units; The steps of forming the color resist layer and performing the second exposure and development process are repeated multiple times to form a plurality of the color resist blocks and the first prism unit, wherein the colors of the plurality of the color resist blocks are different.

8. A display device, characterized in that: The device comprises a display panel and the color film structure according to any one of claims 1 to 6, wherein the color film structure is located on the light-emitting side of the display panel.

Images