CN112640117A - Display device and method of manufacturing the same - Google Patents
Display device and method of manufacturing the same Download PDFInfo
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- CN112640117A CN112640117A CN201880094164.1A CN201880094164A CN112640117A CN 112640117 A CN112640117 A CN 112640117A CN 201880094164 A CN201880094164 A CN 201880094164A CN 112640117 A CN112640117 A CN 112640117A
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- 238000000034 method Methods 0.000 claims abstract description 33
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
Abstract
The invention relates to the technical field of display, and discloses a display device, which comprises a first substrate; the color filter layer is arranged on the first substrate; and the light emitted by the light-emitting layer forms colored light after passing through the colored filter layer. The display device further comprises a second substrate and a blocking layer, wherein the second substrate is arranged on one side of the color filter layer, which is far away from the first substrate, and covers the color filter layer. The invention also discloses a preparation method of the display device, which comprises the following steps: providing a first substrate; forming a plurality of spaced black matrices on a first substrate; and forming a color filter unit between the adjacent black matrixes to form a color filter layer. The display device and the preparation method thereof provided by the invention can reduce the process manufacturing difficulty of the large-size OLED display device, improve the process yield of the OLED display device, and are suitable for high-resolution and flexible display devices.
Description
The invention relates to the technical field of display, in particular to a display device and a preparation method thereof.
Organic electroluminescent (OLED) display devices are increasingly used because of their advantages such as high contrast, high brightness, self-luminescence, and low power consumption. OLED display devices typically display color images with three subpixels, red, green, and blue. Usually, the sub-pixels are prepared by using a Fine Metal Mask (FMM), however, the manufacturing process using such a Mask is complicated and the manufacturing difficulty is high.
Disclosure of Invention
The embodiment of the invention provides a display device and a preparation method thereof, which can reduce the process manufacturing difficulty, and the specific technical scheme is as follows.
A display device includes a first substrate; the color filter layer is arranged on the first substrate; and the light emitted by the light-emitting layer forms colored light after passing through the colored filter layer. The display device further comprises a second substrate and a barrier layer, the second substrate is arranged on the color filter layer and is far away from one side of the first substrate, the color filter layer is covered by the second substrate, and the barrier layer is arranged on the second substrate and is far away from one side of the color filter layer.
Preferably, the color filter layer includes a plurality of color filter units. The plurality of color filter units include a red filter unit, a green filter unit, and a blue filter unit. The color filter layer further comprises a plurality of black matrixes, and each black matrix is arranged between two adjacent color filter units.
A method of manufacturing a display device, comprising the steps of: providing a first substrate; forming a plurality of spaced black matrices on the first substrate; and forming a color filter unit between the adjacent black matrixes to form a color filter layer.
Preferably, the forming of the color filter unit between the adjacent black matrices includes: and forming a color light resistor connected with the black matrix on the first substrate, and patterning the color light resistor to form the color light filtering unit. The color filter unit comprises a first color filter unit and a second color filter unit with different colors, and when the second color filter unit is formed, a manufactured color light resistor of the first color filter unit is formed first, and then the color light resistor is patterned to form the second color filter unit.
Preferably, when the second color filter unit is formed, the color photoresist connected to the first color filter unit is flush with the top surface of the first color filter unit.
Preferably, when the second color filter unit is formed, a height difference exists between the color photoresist connected with the first color filter unit and the top surface of the first color filter unit.
The display device and the preparation method provided by the invention do not need to adopt FMM to prepare the sub-pixels, so that the process difficulty can be reduced, the process yield can be improved, the display device can be applied to large-size and high-resolution display devices, and the requirements of flexibility, thinness and thinness can be met.
The following drawings are included to provide a detailed description of various embodiments of the invention. It should be understood that the elements illustrated in the drawings are not necessarily to scale, and that they are merely schematic representations made for clarity of illustration and are not to be construed as limitations of the invention.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display device according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for manufacturing a display device according to a third embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a method of forming a black matrix on a first substrate according to a third embodiment of the present invention;
fig. 5 is a flowchart illustrating a method of forming a black matrix on a first substrate according to a third embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a method for forming a blue filter unit on a first substrate according to a third embodiment of the invention;
fig. 7 is a flowchart illustrating a method for forming a blue filter on a first substrate according to a third embodiment of the present invention;
fig. 8 is a schematic view of a color filter layer on a first substrate according to a third embodiment of the invention;
fig. 9 is a schematic view of a method for sequentially forming a second substrate and a barrier layer in a display device according to a third embodiment of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to a plurality of embodiments and accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, an OLED display device 100 according to a first embodiment of the invention is shown. The display device 100 includes a first substrate 102, a color filter layer 103 disposed on the first substrate 102; and a light emitting layer 107, wherein light emitted by the light emitting layer 107 forms colored light after passing through the color filter layer 103. The display device 100 further includes a second substrate 104, wherein the second substrate 104 is disposed on a side of the color filter layer 103 away from the first substrate 102 and covers the color filter layer 103; a barrier layer 105 disposed on a side of the second substrate 104 away from the color filter layer 103.
The first substrate 102 is disposed on a hard substrate 101, and the hard substrate 101 is a transparent glass substrate for supporting the first substrate 102. The color filter layer 103 includes a plurality of color filter units, specifically, a red filter unit 113a, a green filter unit 113b, and a blue filter unit 113c, which are disposed adjacent to each other at intervals. Each color filter unit is formed by patterning a photoresist material, and the photoresist material for forming the color filter units includes, but is not limited to, resin, which can perform a color filtering function and also has high flexibility. Preferably, the flexibility of the color filter material is consistent with or close to that of the first substrate 102, so as to protect the color filter better.
The color filter layer 103 further includes a black matrix 123a, and the black matrix 123a is disposed between two adjacent color filter units. The black matrix 123a is made of a high light-shielding material, and may be, for example, a resin material or a metal material doped with a light-shielding substance. The black matrix 123a is used to increase the contrast ratio of the display and avoid color mixing. Preferably, the thickness of the black matrix 123a is less than or equal to the thickness of the color filter unit. Preferably, the flexibility of the material of the black matrix 123a is consistent with or close to that of the first substrate 102, so that the color filter layer 103 has flexibility and is suitable for a bendable display screen.
The second substrate 104 is used as a planarization layer of the color filter layer 103, and is a transparent flexible substrate together with the first substrate 102. The materials of the first substrate 102 and the second substrate 104 include a metal substrate, an organic polymer substrate, a metal oxide substrate, and the like, and preferably an organic polymer substrate such as polyethylene terephthalate, polyethersulfone, polyethylene naphthalate, cyclic olefin copolymer, or polyimide. Preferably, the first substrate 102 and the second substrate 104 are polyimide resin or modified polyimide resin. The barrier layer 105 is disposed on a side of the second substrate 104 away from the color filter layer 103, and is used for blocking external water and oxygen and protecting the internal structure of the display device 100. The barrier layer 105 is an inorganic material selected from an oxide, nitride, oxynitride or fluoride. Preferably, the barrier layer 105 includes a plurality of silicon dioxide and silicon nitride layers alternately stacked.
The display device 100 also includes a thin film transistor array 106 and an encapsulation layer 108. The thin film transistor array 106 is disposed on a side of the color filter layer 103 away from the hard substrate 101, and the encapsulation layer 108 covers the light emitting layer 107. The material of the encapsulation layer 108 includes a plurality of organic layers and inorganic layers alternately stacked for isolating external water and oxygen. The light emitted from the light emitting layer 107 passes through the thin film transistor array 106, the color filter layer 103, and the hard substrate 101 in sequence, and is received by an observer to display red, green, and blue light, thereby realizing full-color display. The light-emitting layer 107 includes a white light-emitting layer, and it is understood that the light-emitting layer 107 may be an independent red, green and blue light-emitting unit in other embodiments.
Referring to fig. 2, an OLED display device 200 according to a second embodiment of the present invention is shown. The display device 200 comprises a hard substrate 201, a thin film transistor array 206 arranged on the hard substrate 201, and a light emitting layer 207 arranged on one side of the thin film transistor array 206 far away from the hard substrate 201. The first substrate 202 is disposed on a side of the light emitting layer 207 away from the tft array 206, and the color filter layer 202 and the second substrate 204 are sequentially stacked on the first substrate 202. In this embodiment, the second substrate 204 is used as a flat layer of the color filter layer 203, the first substrate 202 and the second substrate 204 are both PI substrates having flexibility, and the flexibility of the color filter layer 203 is close to the flexibility of the two substrates. Specifically, the light emitting layer 207 in this embodiment is a white light emitting layer. The white light emitting layer is excited to emit white light, and the white light passes through the color filter layer 202 to respectively display red, green and blue lights, so that the display device 200 is fully colored.
The display device 200 further includes a barrier layer 205 disposed on a side of the second substrate 204 away from the color filter layer 203; and the packaging layer 208 is arranged on one side of the barrier layer 205 far away from the second substrate 204, and is used for enhancing the protection of the display device 200, improving the wear resistance of the display device 200 and prolonging the service life of the display device 200.
Compared with the combination of the common white light OLED display device and the filter, the display device in the embodiment has the advantage that the whole thickness of the display screen of the display device provided by the invention is thinner because the color filter unit is directly prepared on the flexible substrate. In addition, the color filter layer adopts materials with flexibility close to the first substrate and the second substrate, so that the structure can be suitable for flexible display screens.
Referring to fig. 3, it is a flowchart of a method for manufacturing a display device according to a third embodiment of the present invention, including the following steps: s1, providing a first substrate; s2, forming a plurality of black matrixes spaced apart on the first substrate; s3, forming a color filter unit between the adjacent black matrixes to form a color filter layer.
Specifically, referring to fig. 3, in the present embodiment, the first substrate 102 in step S1 is disposed on a hard substrate 101, and the hard substrate 101 is preferably a transparent glass substrate. The first substrate 102 is a flexible PI (polyimide) layer, and is a transparent PI layer formed on a glass substrate by spray coating, and then the PI layer is thermally baked to be cured. It is understood that other methods of forming the PI layer on the hard substrate 101 are equally applicable, such as slit coating, spin coating, and the like.
Step S2 includes forming a plurality of spaced black matrices on the first substrate. Referring to fig. 4 and 5, a method for forming a black matrix 123a on the first substrate 102 according to a third embodiment of the invention is shown. Step S301, as shown in fig. 4a 3, is to clean the first substrate 102, in this embodiment, the PI substrate, which is a conventional means for those skilled in the art and will not be described herein. In step S302, as shown in fig. 4b, a black photoresist is coated on the PI substrate by a spin coating method to form a black photoresist layer 123. Step S303, drying the black photoresist layer 123 formed in the previous step in vacuum, baking and cooling the same. In steps S304 and S305, as shown in fig. 4, 3c and 3d, the black photoresist layer 123 is irradiated with an exposure machine under a pattern mask with a fixed interval, and then is subjected to a developing process with a developing solution, to form a black matrix precursor having a black matrix pattern. In step S306, as shown in fig. 4, 3e, the black matrix precursor is dried to form the black matrix 123 a.
Step S3 includes forming a color filter unit between adjacent black matrixes, and finally forming a color filter layer. The color filter unit comprises a first color filter unit and a second color filter unit with different colors, and when the second color filter unit is formed, a color photoresist connected with the manufactured first color filter unit is formed first, and then the color photoresist is patterned to form the second color filter unit. Specifically, please refer to fig. 6 and fig. 7, which are a schematic diagram and a flowchart illustrating a method for forming a color filter unit on a first substrate 102 according to a third embodiment of the present invention. In step S311, as shown in fig. 6, 4a, the PI substrate is cleaned. In step S312, as shown in fig. 6 b, a blue photoresist is coated on the PI substrate by a spin coating method to form the blue photoresist layer 113. In step S313, the blue photoresist layer 113 is vacuum-dried, baked, and cooled. In steps S314 and S315, as shown in fig. 6, 4c and 4d, the blue photoresist layer 113 is exposed to ultraviolet rays and then is subjected to a developing process using a developing solution to be patterned. In step S316, as shown in fig. 6, 4e, the blue light-blocking layer 113 in the above step is baked to obtain the blue light-filtering unit 113 c.
Next, the same operation is performed to form a green filter 113b and a red filter 113a on the PI substrate. The preparation sequence of each color filter unit is not limited in the invention. In addition, when the second color filter unit is formed, the color photoresist connected with the first color filter unit is flush with the top surface of the first color filter unit. That is, the thicknesses of the color filter units are uniform, and in the present embodiment, the thicknesses of the blue filter unit, the green filter unit, and the red filter unit are uniform. The preparation method of the display device provided by the invention also comprises the condition that the thicknesses of the color filter units are not consistent. As shown in fig. 8, the color filter layer 103 of the display device is formed through the above steps.
In the present embodiment, the red filter unit 113a, the green filter unit 113b, the blue filter unit 113c and the black matrix 123a of the color filter layer all belong to a negative photoresist. The molecular bonds of the negative photoresist are crosslinked by the irradiation of light and are not easy to be washed away, so that in the yellow light process, the molecules of the portion shielded by the photomask are dissolved in the developing solution and washed away because no crosslinking action is generated among the molecules. In addition, the color filter unit can also be prepared by other methods, such as a spraying method, wherein the black matrix 123a is formed on the first substrate 102, and then the red, green and blue photoresist materials are accurately sprayed in the corresponding color block regions by an ink-jet method, so that the exposure and development processes are omitted.
In the process of forming the color filter layer, the Common Metal Mask is adopted to prepare the color filter unit, firstly, the process of the scheme is simple, the manufacturing difficulty is greatly reduced compared with that of evaporating each sub-pixel by utilizing a fine Metal Mask, and the manufacturing cost is reduced. Secondly, the scheme overcomes the problem that the yield of the display device is reduced due to the fact that the alignment adjustment is needed when the sub-pixels are evaporated by using a fine metal mask plate.
Referring to fig. 9, after the color filter layer 103 is formed, in a further embodiment, the method for manufacturing a display device further includes step S4: a second substrate 104, i.e., a PI layer, is formed on the color filter layer 103. The second PI layer is used to planarize the color filter layer 103, and the manufacturing method is the same as that of the first PI layer. Spray coating, slit coating and spin coating can be adopted, and then baking is carried out to harden the coating. The first substrate, the second substrate and the color filter layer have the same flexibility, so the color filter layer can be suitable for a flexible display device.
Referring to fig. 9, in a further embodiment, the method for manufacturing a display device further includes step S5: a barrier layer 105 is formed on the second substrate 104. The barrier layer 105 is used to block the external water and oxygen from invading and protect the internal structure of the display device. The barrier layer 105 is an inorganic material selected from an oxide, a nitride, an oxynitride or a fluoride, and is formed on the second substrate 104 by deposition. In the present embodiment, the barrier layer 105 includes a plurality of silicon dioxide and silicon nitride layers alternately stacked.
FMM evaporation is needed in the preparation process of three luminous zone layers of red, green and blue of an existing organic electroluminescent (OLED) display device. But the high resolution requires very high alignment precision during evaporation, which results in high alignment difficulty; in addition, when FMM evaporation is used, the probability of generating foreign matters in the preparation process is increased, and therefore the yield of thin film packaging is reduced. According to the preparation method of the display device, the color filter layer is manufactured on the flexible substrate in a photoetching or spraying mode, so that the use of FMM is avoided, and the preparation process of a large-size display device and the requirements of lightness and thinness of the display device can be met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (20)
- A display device, comprising:a first substrate;the color filter layer is arranged on the first substrate; andand the light emitted by the light emitting layer forms colored light after passing through the colored filter layer.
- The display device according to claim 1, wherein the display device further comprises a second substrate and a barrier layer, the second substrate is disposed on a side of the color filter layer away from the first substrate and covers the color filter layer, and the barrier layer is disposed on a side of the second substrate away from the color filter layer.
- The display device according to claim 1, wherein the color filter layer includes a plurality of color filter units.
- The display device according to claim 3, wherein the plurality of color filter units include a red filter unit, a green filter unit, and a blue filter unit.
- The display device according to claim 3, wherein the color filter layer further comprises a plurality of black matrices, each black matrix being disposed between two adjacent color filter units.
- The display device according to claim 3, wherein each of the color filter units is formed by patterning a photoresist material.
- The display device according to claim 1, wherein the second substrate serves as a planarization layer of the color filter layer.
- The display device of claim 1, wherein the first substrate and the second substrate are both flexible substrates.
- The display device according to claim 1, wherein a material of the color filter layer includes a resin, and wherein a flexibility of the material of the color filter layer conforms to that of the first substrate.
- A method for manufacturing a display device, comprising the steps of:providing a first substrate;forming a plurality of spaced black matrices on the first substrate;and forming a color filter unit between the adjacent black matrixes to form a color filter layer.
- The method of manufacturing a display device according to claim 10, wherein forming the color filter unit between the adjacent black matrices includes: and forming a color light resistor connected with the black matrix on the first substrate, and patterning the color light resistor to form the color light filtering unit.
- The method of claim 10, wherein the color filter unit comprises a first color filter unit and a second color filter unit with different colors, and when the second color filter unit is formed, a color photoresist connected to the first color filter unit is formed, and then the color photoresist is patterned to form the second color filter unit.
- The method of manufacturing a display device according to claim 12, wherein a color resist connecting the first color filter is flush with a top surface of the first color filter when the second color filter is formed.
- The method of manufacturing a display device according to claim 12, wherein a height difference exists between the color resist connected to the first color filter and a top surface of the first color filter when the second color filter is formed.
- The method of manufacturing a display device according to claim 11, wherein the color resist is a light-transmitting material, and the black matrix is an opaque material.
- The method of manufacturing a display device according to claim 11, wherein the color resist formed on the first substrate covers the black matrix.
- The method for manufacturing a display device according to claim 10, further comprising a step of forming a planarizing layer over the color filter layer.
- The method according to claim 10, wherein the color filter layer is made of a flexible material.
- The method for manufacturing a display device according to claim 10 or 17, wherein the first substrate and the planarization layer are both made of a flexible material.
- A method for manufacturing a display device according to claim 10, further comprising a step of forming a barrier layer on the planarization layer.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/098124 WO2020024181A1 (en) | 2018-08-01 | 2018-08-01 | Display device and preparation method therefor |
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| CN112640117A true CN112640117A (en) | 2021-04-09 |
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| WO (1) | WO2020024181A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104395375A (en) * | 2013-06-26 | 2015-03-04 | 东丽株式会社 | Polyimide precursor, polyimide, flexible substrate using same, color filter and manufacturing method therefor, and flexible display device |
| CN107073914A (en) * | 2014-09-30 | 2017-08-18 | 东丽株式会社 | Display supporting substrates, use its colour filter and its manufacture method, organic EL element and its manufacture method and flexible organic el display |
| CN108336112A (en) * | 2018-01-30 | 2018-07-27 | 上海瀚莅电子科技有限公司 | A kind of colored filter and preparation method thereof, display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013012477A (en) * | 2011-06-28 | 2013-01-17 | Cbrite Inc | Hybrid full-color active matrix organic light emitting display |
| KR102146271B1 (en) * | 2015-06-03 | 2020-08-21 | 동우 화인켐 주식회사 | Flexible color filter and manufacturing method thereof |
| KR20170140495A (en) * | 2016-06-10 | 2017-12-21 | 삼성디스플레이 주식회사 | Display device and fabricating method thereof |
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2018
- 2018-08-01 CN CN201880094164.1A patent/CN112640117A/en active Pending
- 2018-08-01 WO PCT/CN2018/098124 patent/WO2020024181A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104395375A (en) * | 2013-06-26 | 2015-03-04 | 东丽株式会社 | Polyimide precursor, polyimide, flexible substrate using same, color filter and manufacturing method therefor, and flexible display device |
| CN107073914A (en) * | 2014-09-30 | 2017-08-18 | 东丽株式会社 | Display supporting substrates, use its colour filter and its manufacture method, organic EL element and its manufacture method and flexible organic el display |
| CN108336112A (en) * | 2018-01-30 | 2018-07-27 | 上海瀚莅电子科技有限公司 | A kind of colored filter and preparation method thereof, display panel |
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| WO2020024181A1 (en) | 2020-02-06 |
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Application publication date: 20210409 |