OLED Display Panels and Display Devices

Abstract

The present invention relates to the field of display technology and discloses an OLED display panel and a display device. The OLED display panel includes a substrate, a plurality of light-emitting regions arranged in an array, and a photoresist structure disposed between the light-emitting regions, the photoresist structure configured to prevent light emitted from the light-emitting regions from being emitted through the substrate between the light-emitting regions when reflected. In the OLED display panel, the substrate side is the emissive light display side, and the photoresist structure disposed between the light-emitting regions prevents light emitted from the light-emitting regions from being emitted through the substrate between the light-emitting regions when reflected, thereby avoiding light leakage of the OLED display panel and improving the display effect of the OLED display panel.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This invention claims priority to a Chinese patent application filed with the China Patent Office, bearing application number 201920716235.9 and titled "OLED Display Panel and Display Device" on May 17, 2019, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of display technology, and in particular to OLED display panels and display devices. [Background technology]

[0003] At present, most OLED display panels have light leakage problems. For example, in related designs, in OLED display panels that use RGBW pixel arrangements, there will be some light leakage between the R and W light-emitting areas, between the W and B light-emitting areas, between the B and G light-emitting areas, and between the G and R light-emitting areas. How to solve these light leakage problems has always been a technical challenge to be solved in this field. Summary of the Invention

[0004] The OLED display panel provided by the embodiment of the present invention comprises: A substrate; A plurality of light emitting regions arranged in an array on the substrate; a photoresist structure disposed on the substrate and between the light emitting region; The photoresist structure is configured to prevent light emitted from adjacent light emitting regions from being reflected and escaping from the substrate side between the light emitting regions.

[0005] Optionally, in the OLED display panel provided by an embodiment of the present invention, each of the light-emitting areas includes a color film and a light-emitting structure, which are sequentially disposed on the substrate; The photoresist structure includes a color resist disposed between color films of adjacent light-emitting regions, the color resist configured to absorb light emitted from the adjacent light-emitting regions.

[0006] Optionally, in the above OLED display panel provided by the embodiments of the present invention, the color resist and the color film of the adjacent light-emitting area have different colors.

[0007] Optionally, in the above OLED display panel provided by the embodiment of the present invention, the two adjacent light-emitting areas are a first light-emitting area and a second light-emitting area respectively, the photoresist structure includes a first color resist and a second color resist disposed between the first light-emitting area and the second light-emitting area, the first color resist and the color film of the first light-emitting area have the same color and are prepared in the same layer, and the second color resist and the color film of the second light-emitting area have the same color and are prepared in the same layer.

[0008] Optionally, in the OLED display panel provided by the embodiment of the present invention, the first color resist and the second color resist are arranged in a layer.

[0009] Optionally, in the OLED display panel provided by an embodiment of the present invention, the first color resist is disposed between the second color resist and a color film of the second light-emitting area, and the second color resist is disposed between the first color resist and a color film of the first light-emitting area.

[0010] Optionally, in the above OLED display panel provided by an embodiment of the present invention, each of the light-emitting areas further comprises a source-drain electrode layer disposed between the substrate and the color film, the source-drain electrode layer comprising a data line; The data lines of the first light-emitting area and the second light-emitting area are parallel and adjacent to each other, and the distance from the boundary between the first color resist and the second color resist to the data lines of the first light-emitting area is equal to the distance from the boundary between the first color resist and the second color resist to the data lines of the second light-emitting area.

[0011] Optionally, in the OLED display panel provided by an embodiment of the present invention, each of the light-emitting regions includes a source-drain electrode layer and a light-emitting structure, which are sequentially disposed on the substrate; The photoresist structure includes a black light absorbing structure disposed between the source and drain electrode layers of adjacent light emitting regions.

[0012] Optionally, in the OLED display panel provided by the embodiment of the present invention, the source-drain electrode layer comprises a data line; The two adjacent light-emitting regions are a third light-emitting region and a fourth light-emitting region, respectively, the data lines of the third light-emitting region and the fourth light-emitting region are parallel and adjacent to each other, and the black light-absorbing structure includes a light-absorbing portion disposed between the data line of the third light-emitting region and the data line of the fourth light-emitting region.

[0013] Optionally, in the above OLED display panel provided by embodiments of the present invention, the photoresist structure includes pixel-defining structures disposed between the light-emitting areas, the pixel-defining structures being a light-absorbing material.

[0014] Optionally, in the OLED display panel provided by an embodiment of the present invention, each of the light-emitting regions includes an anode, a light-emitting layer, and a cathode, which are sequentially disposed on the substrate, and the cathodes of the plurality of light-emitting regions constitute an overall common electrode layer; The photoresist structure includes a first opening disposed across the electrode layer, the first opening being located opposite a portion between adjacent light emitting regions.

[0015] Optionally, the OLED display panel further comprises a pixel defining structure disposed between the light emitting areas; The photoresist structure further includes a second opening disposed in the pixel defining structure, the projection of the second opening on the substrate overlaying the projection of the first opening on the substrate.

[0016] Optionally, each of the light emitting regions comprises a source-drain electrode layer disposed between the substrate and the anode, the source-drain electrode layer comprising a data line; Two adjacent light-emitting regions are a fifth light-emitting region and a sixth light-emitting region, the data lines of the fifth light-emitting region and the sixth light-emitting region are parallel and adjacent to each other, the first opening is disposed between the fifth light-emitting region and the sixth light-emitting region, and the width of the first opening is greater than the distance between the data line of the fifth light-emitting region and the data line of the sixth light-emitting region.

[0017] An embodiment of the present invention also provides a display device comprising the OLED display panel according to any one of the above. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of a partial top view of an OLED display panel provided by an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of a partial cross-sectional structure between two light-emitting areas of a conventional OLED display panel. [Diagram 3] 1 is a schematic diagram of a partial cross-sectional structure of an OLED display panel provided by an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram of a partial cross-sectional structure of an OLED display panel provided according to another embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic diagram of a partial cross-sectional structure of an OLED display panel provided according to another embodiment of the present invention. [Figure 6]FIG. 2 is a schematic diagram of a partial cross-sectional structure of an OLED display panel provided according to another embodiment of the present invention. [Figure 7] FIG. 2 is a schematic diagram of a partial cross-sectional structure of an OLED display panel provided according to another embodiment of the present invention. [Figure 8] FIG. 2 is a schematic diagram of a partial cross-sectional structure of an OLED display panel provided according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In order to clarify the purpose, technical solution and advantages of the embodiments of the present invention, the technical solution of the embodiments of the present invention will be described clearly and completely below with reference to the drawings of the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and do not include all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0020] As shown in Figures 1, 3-8, an embodiment of the present invention provides an OLED display panel including a substrate 1, a plurality of light-emitting regions 2 arranged in an array, and a photoresist structure located between the light-emitting regions 2. For example, the photoresist structure is a color resist 41 in Figures 3 and 4, a light-absorbing portion 42 in Figure 5, a pixel-defining structure 43 in Figure 6, and a first opening 44 and a second opening 45 in Figures 7 and 8. Specifically, the photoresist structure is configured to prevent light emitted from the light-emitting regions 2 from being reflected from the side of the substrate 1 between the light-emitting regions 2.

[0021] The above OLED display panel uses the substrate 1 side as the emission light display side, and has a photoresist structure between the light-emitting regions 2. The photoresist structure can prevent the light emitted from the light-emitting regions 2 from being reflected and exiting from the substrate 1 side between the light-emitting regions 2, thereby avoiding light leakage of the OLED display panel and improving the display effect of the OLED display panel.

[0022] Optionally, in certain embodiments provided by the present invention, as shown in Figures 3 to 8, each light-emitting region 2 includes a source-drain electrode layer (metal layer), a color film 31, and a white light OLED light-emitting structure 32, which are sequentially arranged on a substrate 1. The source-drain electrode layer (metal layer) includes structures such as a data line 33 and a source-drain electrode. The OLED light-emitting structure 32 includes a cathode 323, a light-emitting layer (EL layer) 322, and an anode 321.

[0023] In the prior art, as shown in FIG. 2, taking two adjacent BG light-emitting regions 2 as an example, the B light-emitting region 2 includes a source-drain electrode layer, a white light OLED light-emitting structure 32 and a blue color film 311. The G light-emitting region 2 includes a source-drain electrode layer, a white light OLED light-emitting structure 32 and a green color film 312. Specifically, the light emitted by the light-emitting structure 32 of the B light-emitting region 2 is converted into blue light R1 through the blue color film 31. The blue light R1 is reflected by the source-drain electrode layer, easily enters between the two pixels of BG, and is reflected by the cathode 323 layer to the substrate 1 and emitted. Similarly, the green light R2 emitted from the G light-emitting region 2 is also easily reflected by the substrate 1 between the two pixels of BG and emitted, and the above situation causes the problem of light leakage.

[0024] Optionally, as shown in Figures 3 and 4, in certain embodiments provided by the present invention, the photoresist structure can include a color resist 41 disposed between the color films 31 of adjacent light-emitting regions 2. The color resist 41 is configured to absorb the light emitted by the adjacent light-emitting regions 2.

[0025] Illustratively, in certain embodiments provided in the present invention, the color resist can be different from the color film of the adjacent light-emitting region. When the light emitted from the light-emitting region 2 is reflected by the source-drain electrode layer to the adjacent layer, it passes through the color resist 41 and is absorbed by the color resist 41, thereby avoiding light leakage.

[0026] Illustratively, in a particular embodiment provided by the present invention, the two adjacent light-emitting regions 2 are a first light-emitting region 21 and a second light-emitting region 22, respectively, and the photoresist structure includes a first color resist 411 and a second color resist 412 disposed between the first light-emitting region 21 and the second light-emitting region 22. The first color resist 411 and the color film 31 of the first light-emitting region 21 have the same color and are prepared in the same layer, and the second color resist 412 and the color film 31 of the second light-emitting region 22 have the same color and are prepared in the same layer.

[0027] Specifically, the first color resist 411 is the same color as the color film 31 of the first light-emitting region 21, and the second color resist 412 is the same color as the color film 31 of the second light-emitting region 22. Furthermore, the light emitted from the first light-emitting region 21 is absorbed by the second color resist 412 when passing through the second color resist 412. The light emitted from the second light-emitting region 22 is absorbed by the color resist 411 when passing through the first color resist 411. Therefore, the emitted light from the adjacent first light-emitting region 21 and second light-emitting region 22 is absorbed between the first light-emitting region 21 and the second light-emitting region 22 (the dotted lines with arrows in Figures 3 and 4 indicate that there is no light transmission, i.e., the light is absorbed), and thus light leakage can be avoided. Since the first color resist 411 and the second color resist 412 are prepared in the same layer as the first light-emitting region 21 and the second light-emitting region 22, no additional process steps are required and the preparation process is very simple.

[0028] Optionally, as shown in FIG. 3, in a particular embodiment provided by the present invention, the first color resist 411 and the second color resist 412 may be arranged in layers.

[0029] Optionally, as shown in FIG. 4, in a specific embodiment provided by the present invention, the first color resist 411 and the second color resist 412 can also be arranged in the same layer. At this time, the first color resist 411 is located between the second color resist 412 and the color film 31 of the second light-emitting region 22, and the second color resist 412 is located between the first color resist 411 and the color film 31 of the first light-emitting region 21. The light of the first light-emitting region 21 is reflected by the source-drain electrode layer, and then reaches the adjacent second color resist 412 and is absorbed by the second color resist 412. The light of the second light-emitting region 22 is reflected by the source-drain electrode layer. Then reaches the adjacent first color resist 411 and is absorbed by the first color resist 411. This arrangement can not only avoid light leakage between adjacent pixels, but also avoid the step generated by the overlap of the color resist layer between pixels, ensuring the uniformity of the color film process.

[0030] Specifically, in certain embodiments provided by the present invention, the sizes of the first color resist 411 and the second color resist 412 may be substantially the same.

[0031] Exemplarily, in a specific embodiment provided by the present invention, as shown in FIG. 1 and FIG. 4, the first light-emitting region 21 and the second light-emitting region 22 are adjacent to each other in the row direction (the direction in which the gate line 34 extends). In addition, the data lines 33 of the first light-emitting region 21 and the second light-emitting region 22 are arranged adjacent to each other and parallel to each other, as an example, and in this case, the first color resist 411 and the second color resist 412 are arranged between the data lines 33 of the first light-emitting region 21 and the data lines 33 of the second light-emitting region 22, and can cover the data lines 33 and connect to the color films 31 of adjacent pixels. In addition, the distance d1 between the boundary line S between the first color register 411 and the second color register 412 and the data line 33 of the first light-emitting region 21 is equal to the distance d2 between the boundary line S and the data line 33 of the second light-emitting region 22, that is, d1=d2.

[0032] Specifically, in a specific embodiment provided by the present invention, as shown in FIG. 1, taking the OLED display panel of the present invention adopting an RGBW pixel array as an example, the first light-emitting area 21 and the second light-emitting area 22 can be an R light-emitting area and a G light-emitting area, or a G light-emitting area and a B light-emitting area.

[0033] Optionally, in certain embodiments provided by the present invention, the photoresist structure may include a black light absorbing structure disposed between the source-drain electrode layers of adjacent light emitting regions 2. Specifically, when light emitted from the light emitting regions is reflected toward the substrate between the adjacent light emitting regions, it passes through and is absorbed by the black light absorbing structure, thus avoiding light leakage.

[0034] Exemplarily, in a specific embodiment provided by the present invention, as shown in FIG. 1 and FIG. 5, two adjacent light-emitting regions 2 are the third light-emitting region 23 and the fourth light-emitting region 24, respectively. The third light-emitting region 23 and the fourth light-emitting region 24 are adjacent to each other in the row direction (the direction in which the gate line 34 extends), and the data lines 33 of the third light-emitting region 23 and the fourth light-emitting region 24 are parallel and adjacent to each other. The black light-absorbing structure includes a light-absorbing portion 42 disposed between the data line 33 of the third light-emitting region 23 and the data line 33 of the fourth light-emitting region 24. Specifically, the light from the third light-emitting region 23 is reflected by the data line 33 to reach the cathode 323, and then reflected by the cathode 323 to reach the light-absorbing portion 42 and absorbed. Similarly, the light from the fourth light-emitting region 24 is reflected by the cathode 323 to reach the light-absorbing portion 42 and absorbed. Therefore, the light emitted from the adjacent third light-emitting region 23 and fourth light-emitting region 24 is absorbed between the third light-emitting region 23 and the fourth light-emitting region 24, thereby preventing light leakage.

[0035] For example, in a specific embodiment provided by the present invention, take the OLED display panel of the present invention adopting an RGBW pixel arrangement as shown in FIG. 1 as an example, in this case, the third light-emitting area 23 and the fourth light-emitting area 24 can be an R light-emitting area and a G light-emitting area, or a G light-emitting area and a B light-emitting area, or a B light-emitting area and a W light-emitting area, or a W light-emitting area and an R light-emitting area.

[0036] Optionally, as shown in FIG. 6, in a particular embodiment provided by the present invention, the photoresist structure can include a pixel-defining structure 43 located between the light-emitting regions 2, and the pixel-defining structure 43 is a light-absorbing material. For example, it can be a black light-absorbing material. Specifically, when the light emitted from the light-emitting regions 2 reaches the pixel-defining structure 43 by reflection of the source-drain electrode layer, it is absorbed by the pixel-defining structure 43, so that it is not reflected to the side of the substrate 1 (the dotted line with an arrow in FIG. 6 indicates that there is no light transmission, i.e., the light is absorbed), and light leakage can be avoided.

[0037] For illustration, in the specific embodiment provided in the present invention, an OLED display panel of the present invention employing an RGBW pixel arrangement is taken as an example, as shown in Fig. 1. In this case, the photoresist structure can include the entire pixel-defining layer, or can only include at least a portion of the pixel-defining structures between the R and G light-emitting regions, between the G and B light-emitting regions, between the B and W light-emitting regions, and between the W and R light-emitting regions. That is, the entire pixel-defining layer can use a black light-absorbing material, or the pixel-defining structures between some pixels can use a black light-absorbing material.

[0038] Optionally, as shown in FIG. 7 and FIG. 8, in a specific embodiment provided by the present invention, the light-emitting structure 32 of each light-emitting region 2 may include an anode 321, a light-emitting layer 322, and a cathode 323, which are sequentially arranged on the substrate 1. And the cathodes 323 of the multiple light-emitting regions 2 constitute a common overall electrode layer 323. Exemplarily, the photoresist structure may include a first opening 44 arranged in the entire electrode layer 323. The first opening 44 is arranged at a position facing the portion between the adjacent light-emitting regions 2, that is, it is provided in the hollowed-out portion of the adjacent light-emitting layer 232 of the cathode 323 layer. Specifically, when the light emitted from the light-emitting region 2 reaches the first opening 44 of the cathode 323 layer by reflection of the source-drain electrode layer, it is emitted from the first opening 44 without being reflected to the side of the substrate 1 (the dotted line with an arrow in FIG. 7 and FIG. 8 indicates that there is no light transmission, that is, the light is absorbed), so that it is possible to prevent light from emitting from the substrate 1 side and prevent light leakage.

[0039] Illustratively, as shown in FIG. 8, in a particular embodiment provided by the present invention, the photoresist structure further includes a second opening 45 located on the pixel-defining structure 43. The projection of the second opening 45 on the substrate 1 covers the projection of the first opening 44 on the substrate 1. Specifically, the position of the second opening 45 corresponds to the position of the first opening 44, and the size of the second opening 45 may be equal to or larger than the first opening 44. The second opening 44 on the pixel-defining structure 43 can prevent light from being reflected by the pixel-defining structure 43 to the side of the substrate 1, thereby further avoiding light leakage.

[0040] Illustratively, in a specific embodiment provided by the present invention, each light-emitting region 2 includes a source-drain electrode layer located between the substrate 1 and the anode 321, and the source-drain electrode layer includes a data line 33. As shown in FIG. 2, FIG. 7 and FIG. 8, two adjacent light-emitting regions 2 are the fifth light-emitting region 25 and the sixth light-emitting region 26, respectively, and the fifth light-emitting region 25 and the sixth light-emitting region 26 are adjacent to each other along the row direction (the direction in which the gate line 34 extends), and the data lines 33 of the fifth light-emitting region 25 and the sixth light-emitting region 26 are parallel and adjacent to each other. A first opening 44 is disposed at a position facing the portion between the fifth light-emitting region 25 and the sixth light-emitting region 26. The width L1 of the first opening 44 is greater than the distance L2 between the data line 33 of the fifth light-emitting region 25 and the data line 33 of the sixth light-emitting region 26. This can better prevent light leakage and light mixing between the fifth light-emitting region 25 and the sixth light-emitting region 26.

[0041] For example, in a specific embodiment provided by the present invention, as shown in FIG. 1, take the OLED display panel of the present invention adopting an RGBW pixel arrangement as an example, in which the fifth light-emitting area 25 and the sixth light-emitting area 26 can be an R light-emitting area and a G light-emitting area, or a G light-emitting area and a B light-emitting area, or a B light-emitting area and a W light-emitting area, or a W light-emitting area and an R light-emitting area.

[0042] Specifically, the OLED display panel of the present invention uses the substrate side as the emitting light display side, and is a bottom emission OLED. Exemplarily, the OLED display panel can be either an RGBW pixel array or an RGB pixel array. In addition, the OLED display panel can be either a white light OLED + color film display mode, or a monochrome OLED display mode, i.e., red light OLED + green light OLED + blue OLED, and the form of the OLED display panel is not limited in the present invention.

[0043] Furthermore, the photoresist structure in the embodiment provided by the present invention may include one or more structures such as the color resist 41 in Figures 3 and 4, the light absorbing portion 42 in Figure 5, the pixel definition 43 in Figure 6, and the first opening 44 and the second opening 45 in Figures 7 and 8. The embodiments of the present invention are merely exemplary descriptions of the photoresist structure, and are not all embodiments of the present invention. Any structure configured to prevent the light emitted from the light emitting regions from being reflected and exiting from the side of the substrate between the light emitting regions falls within the protection scope of the photoresist structure in the present invention.

[0044] Based on the same inventive idea, an embodiment of the present invention also provides a display device including any of the above OLED display panels. The display device can be applied to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, etc. The principle of solving the problem of the display device is similar to that of the above-mentioned display panel, so the implementation of the display device can refer to the implementation of the above-mentioned display panel, and the description will not be repeated.

[0045] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention are within the scope of the claims of the present invention and equivalent techniques, the present invention also intends to include these modifications and variations.

Claims

1. A substrate; A plurality of light emitting regions arranged in an array on the substrate; a photoresist structure disposed on the substrate and between the light emitting regions; Including, the photoresist structure is configured to prevent light emitted from adjacent light-emitting regions from being reflected between two pixels by the source-drain electrode layer and then being reflected by the cathode layer to the substrate and then being emitted from the substrate side between the light-emitting regions; Each of the light emitting regions includes a source-drain electrode layer, a color film, and a white light OLED light emitting structure, which are sequentially arranged on the substrate; Each of the white light OLED light emitting structures includes an anode, a light emitting layer, and a cathode; The cathodes of the plurality of light emitting regions constitute a common electrode layer overall; the photoresist structure includes a first opening disposed across the electrode layer, the first opening being disposed at a position opposite a portion between adjacent light emitting regions.

2. further comprising a pixel defining structure disposed between the light emitting regions; 2. The OLED display panel of claim 1 , wherein the photoresist structure further comprises a second opening disposed in the pixel defining structure, the projection of the second opening on the substrate overlaying the projection of the first opening on the substrate.

3. the source / drain electrode layer includes a data line; 3. The OLED display panel of claim 1, wherein two adjacent light-emitting regions are a fifth light-emitting region and a sixth light-emitting region, the data lines of the fifth light-emitting region and the sixth light-emitting region are parallel and adjacent to each other, the first opening is disposed between the fifth light-emitting region and the sixth light-emitting region, and the width of the first opening is greater than the distance between the data line of the fifth light-emitting region and the data line of the sixth light-emitting region.

4. A display device comprising an OLED display panel according to any one of claims 1 to 3.

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