CN113241361B

CN113241361B - OLED display panel

Info

Publication number: CN113241361B
Application number: CN202110594840.5A
Authority: CN
Inventors: 倪晶
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2023-02-03
Anticipated expiration: 2041-05-28
Also published as: CN113241361A

Abstract

The invention provides an OLED display panel which comprises an array substrate, a light-emitting device layer, an encapsulation layer, a touch layer and a polarizing layer, wherein the light-emitting device layer is positioned on the array substrate; the polarized light layer comprises a color light filtering color resistance layer which is arranged in contraposition with the light-emitting device layer and a black matrix which is positioned between the color light filtering color resistance layers, wherein an optical gain layer is also arranged between the polarized light layer and the packaging layer; the invention replaces the polyvinyl alcohol polaroid of the prior art with the color filtering color resistance layer, directly manufactures the color filtering color resistance layer on the screen body, can meet the flexible form change of the flexible display panel, can also greatly reduce the thickness of the display panel, further improves the light-emitting rate, sets the gain blocks with different refractive indexes aiming at different color resistance blocks, and can further improve the light-emitting effect of the whole OLED display panel.

Description

OLED display panel

Technical Field

The invention relates to the technical field of display, in particular to an OLED display panel.

Background

An Organic Light Emitting Diode (OLED) display panel has the characteristics of self-luminescence, high contrast, wide viewing angle, high response speed, and the like. The working principle is that an ITO transparent electrode and a metal electrode are respectively used as an anode and a cathode of the device, under the drive of certain voltage, electrons and holes are respectively injected into an electron and hole transmission layer from the cathode and the anode, the electrons and the holes respectively migrate to a light-emitting layer through the electron and hole transmission layer and meet in the light-emitting layer to form excitons, so that molecules of the light-emitting layer are excited, and visible light is radiated.

The polaroid of current OLED mainstream product generally adopts outer hanging, attaches the compound rete of polaroid alone on the screen body promptly, avoids the interference to OLED light-emitting through the reverberation that reduces environment natural light and penetrate into in the screen to improve and show the visuality. With the development trend of OLED mobile phones, the flexible form means that the thickness requirement of the screen body is thinner and thinner, however, the current thickness of the polarizer is higher (usually greater than 100 um), and the lower transmittance of the polarizer itself may lose part of light, reduce the brightness and viewing angle of the flexible display panel, and affect the user experience of the product.

In summary, a new OLED display panel is needed to solve the above-mentioned technical problems that the flexible display panel cannot meet the requirement of flexible form, the thickness of the polarizer is large, and the transmittance is low, which may cause partial light loss and reduce the brightness and viewing angle of the flexible display panel.

Disclosure of Invention

The invention provides an OLED display panel, which can solve the problems that the requirement of a flexible display panel on a flexible form cannot be met in the prior art, the thickness of the conventional polarizer is large, partial light is lost due to low transmittance, and the brightness and the visual angle of the flexible display panel are reduced.

The technical scheme provided by the invention is as follows:

the embodiment of the invention provides an OLED display panel, which comprises an array substrate, a light-emitting device layer positioned on the array substrate, an encapsulation layer positioned on the light-emitting device layer, and a polarizing layer positioned on the encapsulation layer.

The polarized light layer comprises a color light filtering color resistance layer and a black matrix, wherein the color light filtering color resistance layer is arranged in an opposite position with the light emitting device layer, the black matrix is positioned between the color light filtering color resistance layers, and an optical gain layer is further arranged between the polarized light layer and the packaging layer.

According to a preferred embodiment of the present invention, a touch layer is disposed between the optical gain layer and the encapsulation layer, wherein a refractive index of the touch layer is smaller than a refractive index of the gain layer.

According to a preferred embodiment of the present invention, the optical gain layer and the touch layer are both of a flat structure, the refractive index of the optical gain layer is 1.6 to 2.1, and the refractive index of the touch layer is 1.5 to 1.7.

According to a preferred embodiment of the present invention, in the thickness direction of the film layer of the OLED display panel, the color filter resistance layer covers the light emitting device layer, and one side of the color filter resistance layer, which is far away from the light emitting device layer, is an arc-shaped structure.

According to a preferred embodiment of the present invention, a first groove, a second groove and a third groove are disposed on a side of the touch layer away from the package layer, the optical gain layer includes a first gain block, a second gain block and a third gain block which are disposed at intervals, and the color filter color resistance layer includes a red color resistance block, a green color resistance block and a blue color resistance block; the first gain block, the second gain block and the third gain block are respectively positioned in the first groove, the second groove and the third groove, and the red color block, the green color block and the blue color block are respectively positioned on the surfaces of the first gain block, the second gain block and the third gain block.

The refractive indexes of the first gain block, the second gain block and the third gain block are all different, and the thickness of the optical gain layer is smaller than that of the touch layer.

According to a preferred embodiment of the present invention, the refractive index of the third gain block is larger than the refractive index of the second gain block, and the refractive index of the second gain block is larger than the refractive index of the first gain block.

According to a preferred embodiment of the present invention, the refractive index of the first gain block is 1.6 to 1.8, the refractive index of the second gain block is 1.7 to 1.9, and the refractive index of the third gain block is 1.8 to 2.1.

According to a preferred embodiment of the present invention, the material of the optical gain layer includes one or more of silicon nitride, silicon oxynitride, aluminum oxide, and zinc oxide, and the optical gain layer is prepared by chemical vapor deposition or atomic layer deposition, and the thickness of the film is 10nm to 2000nm.

According to a preferred embodiment of the present invention, the light emitting device layer comprises light emitting devices arranged in an array, and the functional film layers of any two adjacent light emitting devices are separated from each other; the light-emitting devices each include an anode, a hole injection layer and a hole transport layer on the anode, a light-emitting material layer on the hole injection layer and the hole transport layer, an electron transport layer and an electron injection layer on the light-emitting material layer, and a cathode on the electron transport layer and the electron injection layer.

According to a preferred embodiment of the present invention, the anode is electrically connected to the drain of the array substrate through a via hole, the source of the array substrate is electrically connected to the anode of an external power source, and the cathode is electrically connected to the cathode of the external power source.

The invention has the beneficial effects that: the embodiment of the invention provides an OLED display panel, which comprises an array substrate, a light-emitting device layer, an encapsulation layer, a touch layer and a polarizing layer, wherein the light-emitting device layer is positioned on the array substrate; the polarized light layer comprises a color light filtering color resistance layer which is arranged in contraposition with the light-emitting device layer and a black matrix which is positioned between the color light filtering color resistance layers, wherein an optical gain layer is also arranged between the polarized light layer and the packaging layer; the invention replaces the polyvinyl alcohol polaroid of the prior art with the color filtering color resistance layer, directly manufactures the color filtering color resistance layer on the screen body, can meet the flexible form change of the flexible display panel, can also greatly reduce the thickness of the display panel, further improves the light-emitting rate, sets the gain blocks with different refractive indexes aiming at different color resistance blocks, and can further improve the light-emitting effect of the whole OLED display panel.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art, the drawings used in the embodiments or technical solutions in the prior art are 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 those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a first film layer structure of an OLED display panel according to the present invention.

Fig. 2 is a schematic diagram of a second film layer structure of an OLED display panel according to the present invention.

Fig. 3 is a schematic diagram of light emitting paths of the touch layer and the optical gain layer in fig. 2.

Fig. 4 is a schematic diagram of a third film structure of an OLED display panel according to the present invention.

Fig. 5 is a schematic diagram illustrating a fourth film structure of an OLED display panel according to 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 terminology is used for purposes of illustration and understanding and is in no way limiting. 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.

The present invention is directed to the problem that the requirement of the flexible display panel in the prior art cannot be met, and the problem that the thickness of the conventional polarizer is large, and the transmittance thereof is low, so that part of light is lost, and the brightness and the viewing angle of the flexible display panel are reduced.

The invention provides an OLED display panel, which comprises an array substrate, a light-emitting device layer positioned on the array substrate, an encapsulation layer positioned on the light-emitting device layer, a touch layer positioned on the encapsulation layer and a polarizing layer positioned on the encapsulation layer; the polarizing layer comprises a color light filtering and color resistance layer which is arranged in contraposition with the light-emitting device layer and a black matrix which is arranged between the color light filtering and color resistance layers, wherein an optical gain layer is also arranged between the polarizing layer and the packaging layer. The invention replaces the polyvinyl alcohol polaroid of the prior art with the colorful filtering color resistance layer, directly makes the colorful filtering color resistance layer on the screen body, can meet the flexible form change of the flexible display panel, can also reduce the thickness of the display panel by a wide margin, further promote the light-emitting rate, in addition the invention sets up the optical gain layer between colorful filtering color resistance layer and touch control layer, set up the gain block of different refractive indexes to different color resistance blocks, can further improve the light-emitting effect of the whole display panel. Referring to fig. 1 to 5, it is specifically described that the OLED display panel 100 of the present invention is a flexible OLED display panel, which can be flexibly changed in shape.

As shown in fig. 1, the present invention provides a first structural diagram of an OLED display panel. As shown in fig. 1, the OLED display panel 100 includes an array substrate 101, a light emitting device layer 110 on the array substrate 101, an encapsulation layer 120 on the light emitting device layer 110, a touch layer 130 on the encapsulation layer 120, and a polarizing layer on the touch layer 130, wherein the polarizing layer includes a color filter resistance layer 140 and a black matrix 150 between the color filter resistance layers 140. According to the invention, the color filtering and color resistance layer 140 is prepared on the surface of the flexible OLED display panel 100, so that a polyvinyl alcohol polarizer in the prior art is replaced, the thickness of the flexible OLED display panel 100 is reduced, and more flexible flexibility is realized.

The surface of the array substrate 101 of the present embodiment is provided with pixel defining layers 114, the pixel defining layers 114 are spaced to form pixel grooves, and the light emitting device layer 110 includes light emitting devices arranged in an array, such as the light emitting device 111, the light emitting device 112, and the light emitting device 113. The functional film layers of any two adjacent light-emitting devices are mutually separated; the light-emitting devices each include an independent anode, a hole injection layer and a hole transport layer on the anode, a light-emitting material layer on the hole injection layer and the hole transport layer, an electron transport layer and an electron injection layer on the light-emitting material layer, and a cathode on the electron transport layer and the electron injection layer. The anode is electrically connected to the drain of the array substrate through the via hole, the source of the array substrate is electrically connected to the anode of the external power source, and the cathode is electrically connected to the cathode of the external power source (not shown in fig. 1).

The connection mode of the driving circuit of the light emitting device is that the array substrate 101 comprises a flexible substrate, a buffer layer located on the flexible substrate, and a plurality of driving thin film transistors arranged on the buffer layer, wherein a planarization layer is arranged on the plurality of driving thin film transistors, through holes are arranged on the planarization layer, and an anode layer of the light emitting device is electrically connected with a drain electrode of the driving thin film transistor through the through holes. The source electrode of the driving thin film transistor is connected with the positive electrode of an external power supply, the corresponding driving chip is attached to the flexible printed circuit board, the negative electrode of the external power supply transmits a corresponding electrical signal to the power wiring layer through the binding area, and finally the power wiring layer transmits the corresponding electrical signal to the cathode of the light-emitting device, so that the required voltage is provided for the light-emitting device.

The light emitting device 111, the light emitting device 112, and the light emitting device 113 of the present embodiment emit red light, green light, and blue light, respectively. The color filter color blocking layer 140 includes color blocks arranged in an array, such as a red color block 141, a green color block 142, and a blue color block 143. The color block is aligned with the light emitting device, the red color block 141 is aligned with the light emitting device 111, the green color block 142 is aligned with the light emitting device 112, and the blue color block 143 is aligned with the light emitting device 113.

The encapsulation layer 120 is located above the light emitting device layer 110 and covers the light emitting device layer 110, the encapsulation layer 120 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 prepared by an inkjet printing method, and the encapsulation layer not only has high light transmittance, but also can effectively relieve the stress of the inorganic layer.

The touch layer 130 is located on the packaging layer 120, and the touch layer 130 includes a driving electrode layer, an insulating layer, a sensing electrode layer, a touch IC detection circuit and a controller; the driving electrode layer, the insulating layer and the sensing electrode layer form a plurality of grid-shaped sensing capacitor units, and the sensing capacitor units are distributed in an array mode in the horizontal direction and the vertical direction. The lead of the induction capacitance unit is connected with the touch IC detection circuit; the touch IC detection circuit is used for detecting a capacitance detection signal of the induction capacitance unit and sending the capacitance detection signal to the controller; the controller is configured to calculate a capacitance variation of the sensing capacitor unit according to the capacitance detection signal, and determine a touch position of the OLED display panel 100. There is very little clearance between two adjacent induction capacitance units, relatively independent, and induction capacitance unit has the flexibility, bends along with flexible OLED display panel 100 together, and induction capacitance unit module is whole transparent, and drive electrode and induction electrode's metal is walked the overlapping that does not all with the luminescent point on luminescent device layer 110 in the induction capacitance unit module, does not influence the normal work of luminescent point, does not influence whole OLED display panel 100's display quality.

The color filter color-resist layer 140 and the black matrix 150 of the embodiment are located on the surface of the touch layer 130, integrated in the OLED display panel 100, and can perform the functions of polarization and filtering. The color filter color-blocking layer 140 covers the light emitting device layer 110 in the film thickness direction of the OLED display panel 100.

In order to improve the light-emitting quality of the OLED display panel 100, an optical gain layer is further disposed between the color filter layer 140, the black matrix 150 and the touch layer 130. As shown in fig. 2, a second structural diagram of an OLED display panel is provided in the present invention. In this embodiment, the optical gain layer 160 and the touch layer 130 are both of a flat structure, the refractive index n1 of the touch layer 130 is smaller than the refractive index n2 of the optical gain layer 160, the refractive index n2 of the optical gain layer 160 is preferably 1.6 to 2.1, and the refractive index n1 of the touch layer 130 is preferably 1.5 to 1.7. When the outgoing light is constant at θ 1 and n1, if it is desired that the outgoing light θ 2 be reduced for a significant condensing effect, the higher n2 is, the better, see fig. 3.

In the embodiment, the color filter resistance layer 140 is prepared on the surface of the flexible OLED display panel 100 to replace the polarizer in the prior art, so as to reduce the thickness of the flexible OLED display panel, thereby achieving more flexible flexibility. In addition, the gain layer 160 is disposed between the color filter layer 140 and the touch layer 130, the optical gain layer 160 is a complete structure, and the refractive index of the optical gain layer 160 is 1.7 to 2.1, so as to further improve the light-emitting effect of the entire flexible display panel 100. The material of the optical gain layer 160 of the present embodiment includes one or more of silicon nitride, silicon oxynitride, aluminum oxide, and zinc oxide. The optical gain layer 160 has a thickness of 10nm to 2000nm and is formed by chemical vapor deposition or atomic layer deposition.

In another embodiment, the refractive index of the touch layer 130 is smaller than the refractive index of the optical gain layer 160, and the refractive index of the optical gain layer 160 is larger than the refractive index of the color filter photoresist layer 140. By adopting the design of the low-refractive-index material layer, the high-refractive-index material layer and the low-refractive-index material layer, the light-emitting rate of the flexible OLED display panel can be further increased.

As shown in fig. 4, a third structural diagram of an OLED display panel is provided in the present invention. The color filter color resistance layer 140 of this embodiment is of an arc structure on the side away from the light emitting device layer 110, the arc structure 1411 is disposed on the surface of the red color resistance block 141, the arc structure 1421 is disposed on the surface of the green color resistance block 142, the arc structure 1431 is disposed on the surface of the blue color resistance block 143, and other structures are similar to those in fig. 2 and are not repeated herein.

As shown in fig. 5, the present invention provides a fourth structural diagram of an OLED display panel. The OLED display panel 100 of the present embodiment includes an array substrate 101, a light emitting device layer 110 on the array substrate 101, an encapsulation layer 120 on the light emitting device layer 110, a touch layer 130 on the encapsulation layer 120, a light gain layer 160 on the touch layer 130, a color filter resistance layer 140 on the light gain layer 160, and a black matrix 150. The color filter photoresist layer 140 and the black matrix 150 constitute a polarizing layer of the OLED display panel 100.

The touch layer 130 is provided with a first groove, a second groove and a third groove on the side away from the packaging layer 120, the optical gain layer 160 includes a first gain block 161, a second gain block 162 and a third gain block 163 which are arranged at intervals, and the color filter color resistance layer 140 includes a red color resistance block 141, a green color resistance block 142 and a blue color resistance block 143; the first gain block 161, the second gain block 162 and the third gain block 163 are respectively positioned in the first groove, the second groove and the third groove, and the red color block 141, the green color block 142 and the blue color block 143 are respectively positioned on the surfaces of the first gain block 161, the second gain block 162 and the third gain block 163; the refractive indexes of the first gain block 161, the second gain block 162 and the third gain block 163 are all different, and the thickness of the optical gain layer 160 is smaller than that of the touch layer 130.

The refractive index of the third gain block 163 of the present embodiment is greater than the refractive index of the second gain block 162, the refractive index of the second gain block 162 is greater than the refractive index of the first gain block 161, the refractive index of the first gain block 161 is preferably 1.6-1.8, the refractive index of the second gain block 162 is preferably 1.7-1.9, and the refractive index of the third gain block 163 is preferably 1.8-2.1, so that the design can increase the color saturation of the light emitted from the OLED display panel 100. The objective is to balance the overall light extraction effect by adjusting the refractive indexes of the red color block 141, the green color block 142, and the blue color block 143, and further adjusting the emission angles of the first gain block 161, the second gain block 162, and the third gain block 163, and further extracting light of different degrees from the red color block 141, the green color block 142, and the blue color block 143.

The embodiment of the invention provides an OLED display panel, which comprises an array substrate, a light-emitting device layer, an encapsulation layer, a touch layer and a polarizing layer, wherein the light-emitting device layer is positioned on the array substrate; the polarizing layer comprises a color light filtering and color resistance layer which is arranged in contraposition with the light-emitting device layer and a black matrix which is positioned between the color light filtering and color resistance layers, wherein an optical gain layer is also arranged between the polarizing layer and the packaging layer; the invention replaces the polyvinyl alcohol polaroid of the prior art with the color filtering color resistance layer, directly manufactures the color filtering color resistance layer on the screen body, can meet the flexible form change of the flexible display panel, can also greatly reduce the thickness of the display panel, further improves the light-emitting rate, sets the gain blocks with different refractive indexes aiming at different color resistance blocks, and can further improve the light-emitting effect of the whole OLED display panel.

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

1. An OLED display panel is characterized by comprising an array substrate, a light-emitting device layer, an encapsulation layer and a polarizing layer, wherein the light-emitting device layer is positioned on the array substrate, the encapsulation layer is positioned on the light-emitting device layer, and the polarizing layer is positioned on the encapsulation layer;

the polarized light layer comprises a color light filtering color resistance layer and a black matrix, wherein the color light filtering color resistance layer is arranged in an opposite position with the light-emitting device layer, the black matrix is positioned between the color light filtering color resistance layers, and an optical gain layer is also arranged between the polarized light layer and the packaging layer;

the light gain layer comprises color resistance blocks with different colors, the light gain layer comprises gain blocks which are arranged corresponding to the color resistance blocks with different colors, and the gain blocks corresponding to the color resistance blocks with different colors have different refractive indexes.

2. The OLED display panel of claim 1, wherein the optical gain layer and the touch layer are both flat structures, the refractive index of the optical gain layer is 1.6 to 2.1, and the refractive index of the touch layer is 1.5 to 1.7.

3. The OLED display panel of claim 2, wherein the color filter resistance layer covers the light emitting device layer in a thickness direction of a film layer of the OLED display panel, and a side of the color filter resistance layer away from the light emitting device layer is an arc-shaped structure.

4. The OLED display panel according to claim 1, wherein a first groove, a second groove and a third groove are formed in a side, away from the encapsulation layer, of the touch layer, the optical gain layer comprises first gain blocks, second gain blocks and third gain blocks which are arranged at intervals, and the color filtering color resistance layer comprises red color resistance blocks, green color resistance blocks and blue color resistance blocks; the first gain block, the second gain block and the third gain block are respectively positioned in the first groove, the second groove and the third groove, and the red color block, the green color block and the blue color block are respectively positioned on the surfaces of the first gain block, the second gain block and the third gain block;

5. The OLED display panel of claim 4, wherein the refractive index of the third gain block is greater than the refractive index of the second gain block, which is greater than the refractive index of the first gain block.

6. The OLED display panel of claim 5, wherein the first gain block has a refractive index of 1.6-1.8, the second gain block has a refractive index of 1.7-1.9, and the third gain block has a refractive index of 1.8-2.1.

7. The OLED display panel according to claim 1, wherein the material of the light gain layer comprises one or more of silicon nitride, silicon oxynitride, aluminum oxide and zinc oxide, and the light gain layer is prepared by chemical vapor deposition or atomic layer deposition, and the thickness of the film layer is 10nm to 2000nm.

8. The OLED display panel of claim 1, wherein the light emitting device layer comprises light emitting devices arranged in an array, and the functional film layers of any two adjacent light emitting devices are spaced apart from each other; the light-emitting devices each include an anode, a hole injection layer and a hole transport layer on the anode, a light-emitting material layer on the hole injection layer and the hole transport layer, an electron transport layer and an electron injection layer on the light-emitting material layer, and a cathode on the electron transport layer and the electron injection layer.

9. The OLED display panel of claim 8, wherein the anode is electrically connected to the drain of the array substrate through a via, the source of the array substrate is electrically connected to the positive electrode of an external power source, and the cathode is electrically connected to the negative electrode of the external power source.