CN114023902B - Display panel - Google Patents
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- CN114023902B CN114023902B CN202111262248.1A CN202111262248A CN114023902B CN 114023902 B CN114023902 B CN 114023902B CN 202111262248 A CN202111262248 A CN 202111262248A CN 114023902 B CN114023902 B CN 114023902B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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Abstract
The invention provides a display panel, which comprises a substrate, a light-emitting device layer positioned on the substrate, an encapsulation layer positioned on the light-emitting device layer, and a light-gathering composite film layer positioned on the encapsulation layer; the light-gathering composite film layer comprises a light-gathering structure and a planarization layer covering the light-gathering structure, the light-gathering structure is a refractive index gradient layer, the direction of the refractive index gradient layer from the light-emitting device layer to the planarization layer is a refractive index gradient direction, and the maximum refractive index of the refractive index gradient layer is smaller than that of the planarization layer; aiming at the problem that the side surfaces of the light condensation structure form different-angle inclination angles in the preparation process, the light condensation structure of the refractive index gradient layer is used for offsetting the influence caused by different refraction angles, so that each part of the light condensation structure maintains a higher light condensation effect, and the whole light emitting efficiency of the display device is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel.
Background
The OLED display panel has characteristics of good luminance, high luminous efficiency, wide viewing angle range, self-luminescence, and the like, and has become a key point in research and application in the field of organic photoelectric display.
In order to improve brightness, luminous efficiency, reduce power consumption and prolong service life of a display device in the prior art, a light extraction structure is adopted for light extraction, and the basic principle of the light extraction structure is that light emitted from the side direction of a luminous pixel is converged to the front side by utilizing the refractive index difference of two sides of an interface, so that the refractive index and the inclined plane angle of a light condensation structure are two key parameters determining the light extraction effect. In the actual photolithography process, the bevel angle cannot be maintained at a constant value, and thus the light converging effect of the structure is reduced.
Therefore, a novel display panel is needed to be provided to solve the technical problems that the size of the light extraction structure in the existing OLED panel is small, and the inclination angle of the inclined plane of the light extraction structure cannot maintain a constant value in the preparation process, which results in the reduction of the light convergence effect.
Disclosure of Invention
The embodiment of the invention provides a display panel, which can solve the technical problems that the size of a light extraction structure in the existing OLED panel is small, and the inclination angle of the inclined plane of the light extraction structure cannot keep a constant value in the preparation process, so that the light convergence effect is reduced.
The embodiment of the invention provides a display panel which comprises a substrate, a light-emitting device layer, an encapsulation layer and a light-gathering composite film layer, wherein the light-emitting device layer is positioned on the substrate, the encapsulation layer is positioned on the light-emitting device layer, and the light-gathering composite film layer is positioned on the encapsulation layer.
The light-gathering composite film layer comprises a light-gathering structure and a planarization layer covering the light-gathering structure, the light-gathering structure is a refractive index gradient layer, the refractive index gradient direction of the refractive index gradient layer is the light-emitting direction of the display panel, and the maximum refractive index of the refractive index gradient layer is smaller than that of the planarization layer.
According to a preferred embodiment of the present invention, the light-gathering structure is a low-refractive-index transparent material, and the refractive index of the light-gathering structure ranges from 1.3 to 1.6; the planarization layer is a high refractive index transparent material, and the refractive index of the planarization layer ranges from 1.5 to 1.9.
According to a preferred embodiment of the present invention, the light-gathering structure is made of one or more materials selected from silicon nitride, silicon oxide, silicon oxynitride, epoxy organic materials and acrylic organic materials; the material of the planarization layer is one or more of epoxy organic material and acrylic organic material, and the planarization layer is doped with ZrO 2 Nanoparticles, tiO 2 Nanoparticles and metalloxane polymers.
According to a preferred embodiment of the present invention, the refractive index of the light-condensing structure gradually increases or decreases from the light-emitting device layer toward the planarization layer.
According to a preferred embodiment of the present invention, the refractive index of the light gathering structure gradually decreases from the light emitting device layer to a position half of the height of the light gathering composite film layer, and the refractive index of the light gathering structure gradually increases from the position half of the height of the light gathering composite film layer to the planarization layer.
According to a preferred embodiment of the present invention, the light-focusing structure is at least provided with a first insulating layer and a second insulating layer, a driving electrode layer is provided on a surface of the first insulating layer, an induction electrode layer aligned with the driving electrode layer is provided on a surface of the second insulating layer, and the driving electrode layer, the induction electrode layer, and a portion of the second insulating layer located between the driving electrode layer and the induction electrode layer form a touch device.
According to a preferred embodiment of the present invention, the second insulating layer is provided with a first driving electrode lead and a second driving electrode lead corresponding to two sides of the sensing electrode layer, and the first driving electrode lead and the second driving electrode lead are electrically connected to two ends of the driving electrode layer respectively.
According to a preferred embodiment of the present invention, the first driving electrode lead and the second driving electrode lead have an L-shaped cross-sectional shape.
According to a preferred embodiment of the present invention, the first driving electrode lead, the second driving electrode lead, the sensing electrode layer and the driving electrode layer are all transparent conductive films.
According to a preferred embodiment of the present invention, the side surface of the light-gathering structure is an arc or an inclined surface, and the light-gathering structure and the light-emitting device in the light-emitting device layer are arranged in a staggered manner.
The invention has the beneficial effects that: the embodiment of the invention provides a display panel, wherein a light-gathering composite film layer is arranged on the surface of the display panel; the light-gathering composite film layer comprises a light-gathering structure and a planarization layer covering the light-gathering structure, the light-gathering structure is a refractive index gradual change layer, the direction of the refractive index gradual change layer from the light-emitting device layer to the planarization layer is the refractive index gradual change direction, and the maximum refractive index of the refractive index gradual change layer is smaller than the refractive index of the planarization layer. Aiming at the problem that the side surfaces of the light condensation structure form different-angle inclination angles in the preparation process, the light condensation structure of the refractive index gradient layer is used for offsetting the influence caused by different refraction angles, so that each part of the light condensation structure maintains a higher light condensation effect, and the integral light emitting efficiency of the display device is improved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel in the prior art.
Fig. 2 is an enlarged schematic view of a light extraction structure of a display panel in the related art.
Fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Fig. 4 is an enlarged schematic view of a light-gathering structure of a display panel according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals, and broken lines in the drawings indicate that the elements do not exist in the structures, and only the shapes and positions of the structures are explained.
As shown in fig. 1, an OLED panel 100 in the prior art includes a substrate 101, a light emitting device layer 102 on the substrate 101, an encapsulation layer 103 on the light emitting device layer 102, and a light collecting composite film layer on the encapsulation layer 103; the light gathering composite film layer comprises a light extraction structure 104 and a planarization layer 105 covering the light extraction structure 104, the light extraction structure 104 is made of photoresist, the planarization layer 105 is made of curing adhesive, the side surface of the light extraction structure 104 is an inclined surface with a preset angle, the light extraction structure 104 and a light emitting device in the light emitting device layer 102 are arranged in a staggered mode, emergent light rays S1 of the light emitting device reach the side surface of the light extraction structure 104 and are reflected and then emergent light rays S2 are emitted again, and the emergent light rays S2 are deviated towards the center of the display panel to form a light gathering effect. As shown in fig. 2, since the light extraction structure 104 is located above the gap of the light emitting device and has a small size, the inclination angle of the inclined plane of the light extraction structure cannot be maintained at a constant value during the manufacturing process, so that arc-shaped slopes with different inclination angles are formed, which results in a technical problem of reducing the light convergence effect.
In view of the foregoing technical problems, an embodiment of the present invention provides a display panel, which includes a substrate, a light emitting device layer located on the substrate, an encapsulation layer located on the light emitting device layer, and a light-gathering composite film layer located on the encapsulation layer; the light-gathering composite film layer comprises a light-gathering structure and a planarization layer covering the light-gathering structure, the light-gathering structure is a refractive index gradient layer, the refractive index gradient direction of the refractive index gradient layer is the light-emitting direction of the display panel, the light-gathering composite film layer is prepared by preferably adopting spray heads carrying different refractive index materials to perform ink-jet printing back and forth in the preparation process, and the maximum refractive index of the refractive index gradient layer is smaller than that of the planarization layer; the invention uses the light condensation structure of the refractive index gradient layer to counteract the influence caused by different refraction surfaces with different angles, so that each part of the light condensation structure maintains higher light condensation effect, the whole light emitting efficiency of the display device is improved, and the defects of the technical problems are overcome.
Specifically, as shown in fig. 3, an embodiment of the present invention provides a film layer structure diagram of a display panel, where the display panel 200 includes a substrate 201, a light emitting device layer 202 located on the substrate 201, an encapsulation layer 203 located on the light emitting device layer 202, and a light-gathering composite film layer located on the encapsulation layer 203. The light-gathering composite film layer comprises a light-gathering structure 204 and a planarization layer 205 covering the light-gathering structure 204, the light-gathering structure 204 is a refractive index gradient layer, the refractive index gradient direction of the refractive index gradient layer is the light-emitting direction of the display panel, and the maximum refractive index of the refractive index gradient layer is smaller than that of the planarization layer 205. The side surface of the light-gathering structure 204 is an arc or an inclined plane, and the light-gathering structure 204 and the light-emitting devices in the light-emitting device layer 202 are arranged in a staggered manner. Aiming at the problem that the side surfaces of the light condensation structure form refraction surfaces with different inclination angles in the preparation process, the light condensation structure of the refractive index gradient layer is used for offsetting the influence caused by the refraction surfaces with different inclination angles, so that each part of the light condensation structure maintains higher light condensation effect, and the integral light emitting efficiency of the device is improved.
The substrate 201 preferably includes a thin film transistor driving circuit film layer, which includes a flexible substrate, a light shielding layer disposed on the flexible substrate, a buffer layer disposed on the flexible substrate and covering the light shielding layer, an active layer disposed on the buffer layer, a first gate insulating layer disposed on the active layer, a first gate electrode disposed on the first gate insulating layer, a second gate insulating layer disposed on the first gate insulating layer and covering the first gate electrode, a second gate electrode disposed on the second gate insulating layer, a first interlayer insulating layer disposed on the second gate insulating layer and covering the second gate electrode, a source electrode and a drain electrode disposed on the first interlayer insulating layer, a second interlayer insulating layer disposed on the first interlayer insulating layer and covering the source electrode and the drain electrode, and a planarization layer disposed on the second interlayer insulating layer. The active layer comprises a channel region corresponding to the lower part of the first grid insulation, and a source electrode contact region and a drain electrode contact region which are respectively positioned at two sides of the channel region, wherein the source electrode contact region and the drain electrode contact region are made of conductive metal oxide semiconductor materials, and the channel region is made of metal oxide semiconductor materials for keeping semiconductor characteristics. The first interlayer insulating layer, the second grid insulating layer and the first grid insulating layer are provided with a source electrode contact hole and a drain electrode contact hole which are respectively corresponding to the upper parts of the source electrode contact region and the drain electrode contact region, the source electrode and the drain electrode are respectively electrically connected with the source electrode contact region and the drain electrode contact region of the active layer through the source electrode contact hole and the drain electrode contact hole, and the orthographic projection of the shading layer on the flexible substrate covers the orthographic projection of the active layer on the flexible substrate, so that the shading layer can completely cover the active layer, the active layer is prevented from being irradiated by light, and the threshold voltage of the driving circuit layer is prevented from generating negative drift.
The light emitting device layer 202 is disposed on the substrate 201 and includes an anode layer, a pixel definition layer disposed above the anode layer, and spacers disposed on the pixel definition layer, for example, spacers and spacers are disposed on two sides of a pixel opening, the spacers are used for supporting the light emitting layer, the pixel definition layer is separately disposed to form the pixel opening, in the pixel opening, the light emitting layer is laid on the anode layer, and the cathode layer is laid on the light emitting layer. The positive pole passes through the positive pole via hole and the drain electrode electrical contact in the drive transistor of thin-film transistor drive circuit rete, this drive transistor's source electrode links to each other with external power supply's positive pole, corresponding driver chip is attached to flexible printed circuit board, external power supply's negative pole is through binding the district, transmit corresponding electrical signal to the power routing layer, last power routing layer transmits corresponding electrical signal to the negative pole layer in the luminous functional layer in the display area, when external power supply positive and negative two are 2V to 10V's DC voltage, the positive pole layer produces the hole, the negative pole layer produces the electron, meet at the luminescent layer, electron and hole are negative electricity and positive respectively, they attract each other, it is luminous to arouse organic material in the luminescent layer, in order to realize OLED display panel 100's normal work. The encapsulation layer 203 is positioned on the light emitting device layer 202 and covers the light emitting device layer 202. The encapsulation layer 203 includes a first inorganic layer, an organic layer, and a second inorganic layer, the first inorganic layer and the second inorganic layer are prepared by physical vapor deposition, the organic layer is generally printed by inkjet, and the organic layer not only has high light transmittance, but also can effectively relieve the stress of the inorganic layer.
The light-gathering composite film layer comprises a light-gathering structure 204 and a planarization layer 205 covering the light-gathering structure 204, the light-gathering structure 204 is a refractive index gradient layer, the refractive index gradient direction of the refractive index gradient layer is the light-emitting direction of the display panel, the maximum refractive index of the refractive index gradient layer is smaller than the refractive index of the planarization layer 204, so that the emergent light can shift towards the center of the display panel to form a light gathering effect.
The light-gathering structure 204 is made of a low-refractive-index transparent material, and the refractive index of the light-gathering structure 204 ranges from 1.3 to 1.6; the planarization layer 205 is a high refractive index transparent material, and the refractive index of the planarization layer 205 ranges from 1.5 to 1.9. The material of the light-gathering structure 204 is one or more of silicon nitride, silicon oxide, silicon oxynitride, epoxy organic materials and acrylic organic materials; the material of the planarization layer 205 is one or more of an epoxy organic material and an acrylic organic material, and the planarization layer 205 is further doped with ZrO 2 Nanoparticles, tiO 2 Nanoparticles and a metalloxane.
The refractive index of the light-gathering structure 204 gradually increases or decreases from the light-emitting device layer toward the planarization layer. The refractive index of the light-gathering structure 204 gradually decreases from the light-emitting device layer to the half-height h2 of the light-gathering composite film layer 204, that is, the bottom h1 of the light-gathering composite film layer 204 points to the half-height h2 of the light-gathering composite film layer 204, and the refractive index of the light-gathering structure 204 gradually increases from the half-height h2 of the light-gathering composite film layer to the planarization layer, that is, from the half-height h2 of the light-gathering composite film layer 204 to the top h3 of the light-gathering composite film layer 204, and the refractive index of the light-gathering composite film layer 204 gradually decreases and then increases, so that the influence caused by different refraction angles of the side surfaces of the arc-shaped ink droplets corresponding to the light-gathering composite film layer 204 is just counteracted, referring to fig. 4.
As shown in fig. 5, an embodiment of the present invention provides another schematic diagram of a film structure of a display panel, in which the light condensing structure 204 in this embodiment at least has a first insulating layer 2041 and a second insulating layer 2042, a driving electrode layer 2061 is disposed on a surface of the first insulating layer 2041, an induction electrode layer 2062 aligned with the driving electrode layer 2061 is disposed on a surface of the second insulating layer 2042, and the driving electrode layer 2061, a portion of the second insulating layer 2042 located between the driving electrode layer 2061 and the induction electrode layer 2062, and the induction electrode layer 2062 form a touch device. A first driving electrode lead 2063 and a second driving electrode lead 2064 are disposed on the second insulating layer 2042 corresponding to the two sides of the sensing electrode layer 2062, and the first driving electrode lead 2063 and the second driving electrode lead 2064 are electrically connected to the two ends of the driving electrode layer 2061 respectively. The first driving electrode lead 2061 and the second driving electrode lead 2062 have an L-shaped cross-sectional shape. The first driving electrode lead 2063, the second driving electrode lead 2064, the sensing electrode layer 2062, and the driving electrode layer 2061 are all transparent conductive thin films.
In this embodiment, the first driving electrode lead 2061, the second driving electrode lead 2062, and the sensing electrode layer 2062 are electrically connected to the corresponding touch display driving chip, wherein the touch display driving chip may be disposed in the display area of the display panel 200 or in the frame of the display panel 200.
In this embodiment, the driving electrode layer 2061 and the sensing electrode layer 2062 are electrically connected to the corresponding touch display driving chip, wherein the touch display driving chip may be disposed in the display area of the display panel 200 or in the frame of the display panel 200. In another embodiment, the first driving electrode lead 2063 and the second driving electrode lead 2064 are electrically connected to the gate of the driving transistor in the pixel driving circuit in the display panel 200.
The invention provides a display panel, which comprises a substrate, a light-emitting device layer positioned on the substrate, an encapsulation layer positioned on the light-emitting device layer, and a light-gathering composite film layer positioned on the encapsulation layer; the light-gathering composite film layer comprises a light-gathering structure and a planarization layer covering the light-gathering structure, the light-gathering structure is a refractive index gradient layer, the direction of the refractive index gradient layer from the light-emitting device layer to the planarization layer is a refractive index gradient direction, and the maximum refractive index of the refractive index gradient layer is smaller than that of the planarization layer; aiming at the problem that the side surfaces of the light condensation structure form different-angle inclination angles in the preparation process, the light condensation structure of the refractive index gradient layer is used for offsetting the influence caused by different refraction angles, so that each part of the light condensation structure maintains a higher light condensation effect, and the integral light emitting efficiency of the device is improved.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention.
Claims (8)
1. A display panel is characterized by comprising a substrate, a light-emitting device layer positioned on the substrate, an encapsulation layer positioned on the light-emitting device layer, and a light-gathering composite film layer positioned on the encapsulation layer;
the light-gathering composite film layer comprises a light-gathering structure and a planarization layer covering the light-gathering structure, the light-gathering structure is a refractive index gradient layer, the refractive index gradient direction of the refractive index gradient layer is the light-emitting direction of the display panel, and the maximum refractive index of the refractive index gradient layer is smaller than that of the planarization layer;
the light-emitting device layer points to the half height of the light-gathering composite film layer, the refractive index of the light-gathering structure is gradually reduced, the half height of the light-gathering composite film layer points to the planarization layer, and the refractive index of the light-gathering structure is gradually increased.
2. The display panel according to claim 1, wherein the light-condensing structure is a low-refractive index transparent material, and the refractive index of the light-condensing structure ranges from 1.3 to 1.6; the planarization layer is a high refractive index transparent material, and the refractive index of the planarization layer ranges from 1.5 to 1.9.
3. The display panel according to claim 2, wherein the light-gathering structure is made of one or more of silicon nitride, silicon oxide, silicon oxynitride, epoxy organic materials and acrylic organic materials; the material of the planarization layer is one or more combined materials of epoxy organic materials and acrylic organic materials, and the planarization layer is doped with ZrO 2 Nanoparticles, tiO 2 Nanoparticles and metalloxane polymers.
4. The display panel according to claim 1, wherein the light-gathering structure is at least provided with a first insulating layer and a second insulating layer, a driving electrode layer is provided on a surface of the first insulating layer, an induction electrode layer aligned with the driving electrode layer is provided on a surface of the second insulating layer, and the driving electrode layer, the induction electrode layer, and a portion of the second insulating layer located between the driving electrode layer and the induction electrode layer form a touch device.
5. The display panel according to claim 4, wherein the second insulating layer is provided with a first driving electrode lead and a second driving electrode lead corresponding to two sides of the sensing electrode layer, and the first driving electrode lead and the second driving electrode lead are electrically connected to two ends of the driving electrode layer respectively.
6. The display panel according to claim 5, wherein the first and second driving electrode leads have an L-shaped cross-sectional shape.
7. The display panel according to claim 5, wherein the first driving electrode lead, the second driving electrode lead, the sensing electrode layer, and the driving electrode layer are all transparent conductive films.
8. The display panel of claim 1, wherein the side of the light gathering structure is an arc or an inclined plane, and the light gathering structure is disposed in a staggered manner with respect to the light emitting devices in the light emitting device layer.
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| CN202111262248.1A CN114023902B (en) | 2021-10-28 | 2021-10-28 | Display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196509A (en) * | 2018-02-27 | 2019-09-03 | 三星显示有限公司 | Display device |
| KR20210050031A (en) * | 2019-10-25 | 2021-05-07 | 삼성디스플레이 주식회사 | Display device |
| CN113224250A (en) * | 2021-04-29 | 2021-08-06 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN113314573A (en) * | 2021-05-24 | 2021-08-27 | 武汉华星光电半导体显示技术有限公司 | Display panel and electronic device |
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| KR20140014682A (en) * | 2012-07-25 | 2014-02-06 | 삼성디스플레이 주식회사 | Organic light emitting diode device and manufacturing method thereof |
| KR102555411B1 (en) * | 2018-10-16 | 2023-07-13 | 엘지디스플레이 주식회사 | Display apparatus having a light-emitting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196509A (en) * | 2018-02-27 | 2019-09-03 | 三星显示有限公司 | Display device |
| KR20210050031A (en) * | 2019-10-25 | 2021-05-07 | 삼성디스플레이 주식회사 | Display device |
| CN113224250A (en) * | 2021-04-29 | 2021-08-06 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN113314573A (en) * | 2021-05-24 | 2021-08-27 | 武汉华星光电半导体显示技术有限公司 | Display panel and electronic device |
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