CN110600518A - Organic electroluminescent display panel and driving method thereof - Google Patents
Organic electroluminescent display panel and driving method thereof Download PDFInfo
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- CN110600518A CN110600518A CN201910886614.7A CN201910886614A CN110600518A CN 110600518 A CN110600518 A CN 110600518A CN 201910886614 A CN201910886614 A CN 201910886614A CN 110600518 A CN110600518 A CN 110600518A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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Abstract
The invention provides an organic electroluminescent display panel and a driving method thereof. The organic electroluminescence display panel comprises a substrate and pixel units arranged on the substrate, wherein each pixel unit comprises a light emitting structure and a driving circuit, each pixel unit is divided into a wide visual angle display area and a narrow visual angle display area, each light emitting structure comprises a wide visual angle light emitting part and a narrow visual angle light emitting part, the wide visual angle light emitting parts are arranged in the wide visual angle display areas, the narrow visual angle light emitting parts are arranged in the narrow visual angle display areas, and the driving circuits can respectively drive the wide visual angle light emitting parts and the narrow visual angle light emitting parts to emit light so as to realize wide visual angle display and narrow visual angle display of the display panel. The organic electroluminescence display panel can realize the respective drive of the wide visual angle light emitting part and the narrow visual angle light emitting part in the pixel unit, thereby realizing the wide visual angle display and the narrow visual angle display of the display panel and further meeting the requirement of people on the privacy and secrecy display function of the organic electroluminescence display panel.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to an organic electroluminescent display panel and a driving method thereof.
Background
Organic Light-Emitting diodes (OLEDs) have the characteristics of active Light emission, vivid color saturation, flexible display, and the like, and are known as next-generation displays. However, as the application of OLED display products increases and various OLED display products are continuously on the market, people have stronger expectations for the display scenes of the OLED display products, wherein privacy security display functions required by the OLED display products in public places (such as OLED display devices or mobile display products) are expected to be realized on the OLED display products, and people have been in strong demand at present.
Disclosure of Invention
The present invention provides an organic electroluminescent display panel and a driving method thereof, which solve the problems of the prior art. The organic electroluminescence display panel can realize the respective drive of the wide visual angle light emitting part and the narrow visual angle light emitting part in the pixel unit, thereby realizing the wide visual angle display and the narrow visual angle display of the display panel and further meeting the requirement of people on the privacy and secrecy display function of the organic electroluminescence display panel.
The invention provides an organic electroluminescence display panel, which comprises a substrate and a pixel unit arranged on the substrate, wherein the pixel unit comprises a light-emitting structure and a driving circuit, the pixel unit is divided into a wide visual angle display area and a narrow visual angle display area, the light-emitting structure comprises a wide visual angle light-emitting part and a narrow visual angle light-emitting part, the wide visual angle light-emitting part is arranged in the wide visual angle display area, the narrow visual angle light-emitting part is arranged in the narrow visual angle display area, and the driving circuit can respectively drive the wide visual angle light-emitting part and the narrow visual angle light-emitting part to emit light so as to realize wide visual angle display and narrow visual angle display of the display panel.
Preferably, one pixel unit includes a plurality of wide viewing angle display regions and a plurality of narrow viewing angle display regions, and the wide viewing angle display regions and the narrow viewing angle display regions are alternately arranged;
the wide-view light emitting part is in a shape of a regular step, and the narrow-view light emitting part is in a shape of an inverted step; the adjacent wide-viewing-angle light emitting parts and the narrow-viewing-angle light emitting parts are mutually butted;
the wide-view-angle light emitting part and the narrow-view-angle light emitting part respectively comprise an insulating layer, an anode layer, a hole injection layer, a hole transport layer, a light emitting layer, a light reflection layer, an electron transport layer, an electron injection layer and a cathode layer which are sequentially far away from the substrate.
Preferably, in one pixel cell, cathode layers of the wide-viewing-angle light emitting section and the narrow-viewing-angle light emitting section are common and connected to the same cathode signal;
the driving circuit comprises a first driving tube for driving the wide viewing angle light emitting part and a second driving tube for driving the narrow viewing angle light emitting part; in one pixel unit, the anode layers of the multiple wide-viewing-angle light-emitting parts are connected with the drain electrode of the same first driving tube; the anode layers of the plurality of narrow viewing angle light-emitting parts are connected with the drain electrode of the same second driving tube;
in one pixel unit, the grid electrode of the first driving tube and the grid electrode of the second driving tube are connected with the same grid line, and the source electrode of the first driving tube and the source electrode of the second driving tube are connected with the same data line.
Preferably, the insulating layer of the wide-viewing-angle light-emitting part is in an upright trapezoidal shape, a plurality of first concave structures are formed on the side surface, away from the substrate, of the insulating layer of the wide-viewing-angle light-emitting part, and a plurality of first convex structures are respectively formed on the side surfaces, close to the substrate, of the anode layer, the hole injection layer, the hole transport layer and the light-emitting layer of the wide-viewing-angle light-emitting part, and the first convex structures correspond to the first concave structures in position and are matched in size and shape;
the insulating layer of narrow visual angle illuminating part is the shape of an inverted terrace, the insulating layer of the narrow visual angle illuminating part deviates from a plurality of second convex structures are formed on the side face of the substrate, a plurality of second concave structures are formed on the side face of the substrate respectively, and the second concave structures correspond to the positions of the second convex structures and are matched in size and shape.
Preferably, the first concave structures are the same in size and shape and are uniformly distributed, the maximum depth of each first concave structure is half of the thickness of the insulating layer of the wide-viewing-angle light-emitting part, and the spacing distance between two adjacent first concave structures is the maximum opening width of each first concave structure;
the second convex structures are the same in size and shape and are uniformly distributed, the maximum height of each second convex structure is half of the thickness of the insulating layer of the narrow-view-angle light-emitting part, and the spacing distance between every two adjacent second convex structures is the maximum width of the second convex structures perpendicular to the height direction of the second convex structures.
Preferably, the cross-sectional shape of the first concave structure parallel to the depth direction thereof is semicircular, semi-elliptical, triangular or trapezoidal;
the section of the second convex structure parallel to the height direction is semicircular, semi-elliptical, triangular or trapezoidal.
Preferably, the refractive index of the insulating layer of the wide-viewing-angle light-emitting part is larger than that of the light-emitting layer thereof;
the refractive index of the insulating layer of the narrow viewing angle light emitting part is smaller than that of the light emitting layer.
Preferably, the anode layers of the wide viewing angle light emitting part and the narrow viewing angle light emitting part are made of an ITO material; the hole injection layer adopts MoO3、WO3Or V2O5(ii) a The hole transport layer is made of a mixed material of TPD and NPB; the luminescent layer adopts organic matter main body CBP or PVK material doped with fluorescent and phosphorescent materials; the light reflecting layer is made of silver or aluminum; the electron transport layer adopts pyridine or phosphine oxide doped with Alq3, BCP or TBPI; the electron injection layer adopts Li and Cs2O3TiOx or MnO; the cathode layer adopts Mg, Al, Ag or the alloy thereof;
the insulating layer of the wide-view light emitting part adopts MQ silicon resin; the insulating layer of the narrow-viewing-angle light-emitting part is made of a composite material containing fluorine and silicon oxide.
Preferably, the threshold voltage of the second driving tube is smaller than the threshold voltage of the first driving tube.
The present invention also provides a driving method of the organic electroluminescent display panel, including:
driving a narrow viewing angle light emitting part of the narrow viewing angle display area to emit light, and realizing narrow viewing angle display of the organic electroluminescent display panel;
the wide-viewing-angle light emitting part of the wide-viewing-angle display area is driven to emit light, and wide-viewing-angle display of the organic electroluminescence display panel is achieved.
Preferably, the narrow viewing angle light emitting part of the narrow viewing angle display region is driven to emit light when driven by a lower driving voltage, so as to realize narrow viewing angle display of the organic electroluminescent display panel;
when the organic electroluminescence display panel is driven by a higher driving voltage, the wide-viewing-angle light emitting part of the wide-viewing-angle display area and the narrow-viewing-angle light emitting part of the narrow-viewing-angle display area are driven to emit light at the same time, and the wide-viewing-angle display and the narrow-viewing-angle display of the organic electroluminescence display panel are realized at the same time.
The invention has the beneficial effects that: according to the organic electroluminescence display panel provided by the invention, the pixel unit is divided into the wide visual angle display area and the narrow visual angle display area, the light emitting structure in the pixel unit is set into the wide visual angle light emitting part and the narrow visual angle light emitting part, and meanwhile, the driving circuit is arranged, so that the wide visual angle light emitting part and the narrow visual angle light emitting part in the pixel unit can be respectively driven, the wide visual angle display and the narrow visual angle display of the display panel are realized, and the requirement of people on the privacy and confidentiality display function of the organic electroluminescence display panel is further met.
Drawings
Fig. 1 is a partial structural cross-sectional view of a pixel unit of an organic electroluminescent display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of light emission from the wide-angle light emitting part in the pixel unit of FIG. 1;
FIG. 3 is a schematic diagram of light emission from the narrow viewing angle light emitting section in the pixel cell of FIG. 1;
fig. 4 is a schematic diagram of a driving circuit of a wide viewing angle light emitting part and a narrow viewing angle light emitting part in one pixel unit of an organic electroluminescent display panel according to an embodiment of the present invention.
Wherein the reference numerals are:
1. a substrate; 2. a wide viewing angle display area; 3. a narrow viewing angle display area; 4. a wide-angle light emitting section; 5. a narrow-viewing-angle light emitting section; 6. an insulating layer; 61. a first concave structure; 62. a first convex structure; 63. a second convex structure; 64. a second concave structure; 7. an anode layer; 8. a hole injection layer; 9. a hole transport layer; 10. a light emitting layer; 11 a light reflecting layer; 12. an electron transport layer; 13. an electron injection layer; 14. a cathode layer; 15. a first drive tube; 16. a second drive tube; 17. a gate line; 18. and a data line.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, an organic electroluminescent display panel and a driving method thereof according to the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
An embodiment of the present invention provides an organic electroluminescent display panel, as shown in fig. 1 to 3, including a substrate 1 and a pixel unit disposed on the substrate 1, where the pixel unit includes a light emitting structure and a driving circuit, the pixel unit is divided into a wide viewing angle display area 2 and a narrow viewing angle display area 3, the light emitting structure includes a wide viewing angle light emitting part 4 and a narrow viewing angle light emitting part 5, the wide viewing angle light emitting part 4 is disposed in the wide viewing angle display area 2, the narrow viewing angle light emitting part 5 is disposed in the narrow viewing angle display area 3, and the driving circuit can respectively drive the wide viewing angle light emitting part 4 and the narrow viewing angle light emitting part 5 to emit light, so as to implement wide viewing angle display and narrow viewing angle display of the.
This organic electroluminescence display panel, through dividing the pixel cell into wide visual angle display area 2 and narrow visual angle display area 3, and set up the light emitting structure in the pixel cell into wide visual angle illuminating part 4 and narrow visual angle illuminating part 5, simultaneously through setting up drive circuit, can realize the drive respectively to wide visual angle illuminating part 4 and narrow visual angle illuminating part 5 in the pixel cell, thereby realize the wide visual angle of display panel and narrow visual angle display, and then satisfied people's privacy secret display function's to organic electroluminescence display panel demand.
Preferably, in this embodiment, one pixel unit includes a plurality of wide viewing angle display regions 2 and a plurality of narrow viewing angle display regions 3, and the wide viewing angle display regions 2 and the narrow viewing angle display regions 3 are alternately arranged; the wide-viewing-angle light-emitting part 4 is in an upright trapezoidal shape, and the narrow-viewing-angle light-emitting part 5 is in an inverted trapezoidal shape; the adjacent wide-viewing-angle light-emitting parts 4 and narrow-viewing-angle light-emitting parts 5 are butted with each other; each of the wide-viewing-angle light-emitting part 4 and the narrow-viewing-angle light-emitting part 5 includes an insulating layer 6, an anode layer 7, a hole injection layer 8, a hole transport layer 9, a light-emitting layer 10, a light-reflecting layer 11, an electron transport layer 12, an electron injection layer 13, and a cathode layer 14, which are disposed in this order away from the substrate 1. The light reflecting layer 11 is provided on the outer side of the light emitting layer 10 away from the substrate 1, and the substrate 1 side of the display panel is a light emitting side, that is, the substrate 1 side of the display panel is a display side.
In the present embodiment, a description will be given taking an example in which one wide viewing angle light emitting section 4 and one narrow viewing angle light emitting section 5 are provided in one pixel unit. Here, the wide viewing angle display region 2 and the narrow viewing angle display region 3 each occupy an 1/2 display area of the pixel cell, and accordingly, the light emitting surfaces of the wide viewing angle light emitting part 4 and the narrow viewing angle light emitting part 5 each occupy a 1/2 display area of the pixel cell. The ladder stand finger is arranged with the bottom surface with larger area close to the substrate 1 and the bottom surface with smaller area far away from the substrate 1. The inverted step refers to the bottom surface with larger area arranged far away from the substrate 1 and the bottom surface with smaller area arranged close to the substrate 1. The adjacent slopes of the adjacent wide-viewing-angle light-emitting portions 4 and narrow-viewing-angle light-emitting portions 5 are butted against each other, thereby constituting an entire light-emitting portion within one pixel unit.
The ratio of the light emitting surfaces of the wide viewing angle light emitting unit 4 and the narrow viewing angle light emitting unit 5 to the area of the pixel unit display region may be different. In addition, if a plurality of wide viewing angle display regions 2 and a plurality of narrow viewing angle display regions 3 are disposed within one pixel unit, the alternating period of the wide viewing angle display regions 2 and the narrow viewing angle display regions 3 is 4 to 8 μm.
Further preferably, in this embodiment, the insulating layer 6 of the wide-viewing-angle light emitting part 4 has an upright-trapezoid shape, a plurality of first concave structures 61 are formed on the side surface of the insulating layer 6 of the wide-viewing-angle light emitting part 4 away from the substrate 1, a plurality of first convex structures 62 are respectively formed on the side surfaces of the anode layer 7, the hole injection layer 8, the hole transport layer 9 and the light emitting layer 10 of the wide-viewing-angle light emitting part 4 close to the substrate 1, and the first convex structures 62 correspond to the first concave structures 61 in position and are matched in size and shape. The provision of the first concave structure 61 facilitates the formation of the first convex structure 62. The first convex structure 62 is arranged to make the light emitted from the light emitting layer 10 exist in each viewing angle direction after being refracted and reflected, thereby facilitating the wide viewing angle light emission of the wide viewing angle light emitting part 4.
The insulating layer 6 of the narrow viewing angle light emitting part 5 is in an inverted trapezoidal shape, a plurality of second convex structures 63 are formed on the side surface of the insulating layer 6 of the narrow viewing angle light emitting part 5, which is away from the substrate 1, a plurality of second concave structures 64 are respectively formed on the side surfaces, close to the substrate 1, of the anode layer 7, the hole injection layer 8, the hole transport layer 9 and the light emitting layer 10 of the narrow viewing angle light emitting part 5, and the second concave structures 64 correspond to the second convex structures 63 in position and are matched in size and shape. The provision of the second male formation 63 facilitates the formation of the second female formation 64. The second concave structure 64 is arranged to make the light emitted from the light emitting layer 10 exit in a smaller exit angle range after being refracted and reflected, thereby facilitating the narrow viewing angle light emission of the narrow viewing angle light emitting part 5.
More preferably, the plurality of first concave structures 61 are uniformly distributed with the same size and shape, the maximum depth of the first concave structure 61 is half of the thickness of the insulating layer 6 of the wide-angle light-emitting part 4, and the distance between two adjacent first concave structures 61 is the maximum opening width of the first concave structure 61. With this arrangement, the first convex structure 62 can also have the above structure, so that it is more favorable for the light emitted from the light-emitting layer 10 to be refracted and reflected and then to exist in each viewing angle direction, and is further favorable for realizing the wide viewing angle light emission of the wide viewing angle light-emitting part 4, for example, the viewing angle of the organic electroluminescent display panel close to 180 ° can be realized.
The second convex structures 63 have the same size and shape and are uniformly distributed, the maximum height of the second convex structure 63 is half of the thickness of the insulating layer 6 of the narrow viewing angle light emitting part 5, and the distance between two adjacent second convex structures 63 is the maximum width of the second convex structure 63 perpendicular to the height direction. So set up, enable the concave structure 64 of second and also have above-mentioned structure to be favorable to making the light that luminescent layer 10 sent can be emergent in less exit angle within range after refraction and reflection more, and then be favorable to realizing the narrow visual angle of narrow visual angle illuminating part 5 is luminous more, if can realize that organic electroluminescent display panel is less than 45 viewing angle.
It should be noted that, the sizes of the plurality of first concave structures 61 may also be different, and the distribution may also be uneven, the maximum depth of the first concave structure 61 may also be greater than or less than half the thickness of the insulating layer 6 of the wide-viewing-angle light-emitting part 4, and the spacing distance between two adjacent first concave structures 61 may also be greater than or less than the maximum opening width thereof, as long as the light emitted by the light-emitting layer 10 can be reflected and refracted to exist in each viewing angle direction, so that the scheme beneficial to realizing the wide-viewing-angle light emission of the wide-viewing-angle light-emitting part 4 is within the protection scope of the present invention.
Similarly, the sizes of the second convex structures 63 may be different, and the distribution may also be uneven, the maximum height of the second convex structures 63 may also be greater than or less than half the thickness of the insulating layer 6 of the narrow-viewing-angle light-emitting part 5, and the distance between two adjacent second convex structures 63 may also be greater than or less than the maximum width of the second convex structures 63 perpendicular to the height direction thereof, as long as the light emitted by the light-emitting layer 10 can be emitted within a smaller emission angle range after being refracted and reflected, so that the scheme beneficial to achieving the narrow-viewing-angle light emission of the narrow-viewing-angle light-emitting part 5 is within the protection scope of the present invention.
Preferably, in the present embodiment, the cross-sectional shape of the first concave structure 61 parallel to the depth direction thereof is a semicircle. The cross-sectional shape of the first concave structure 61 parallel to the depth direction thereof may be a semi-elliptical shape, a triangular shape, a trapezoidal shape, or other shapes. In short, the first convex structure 62 is only required to make the light emitted from the light emitting layer 10 exist in more viewing angle directions after being refracted and reflected, which is beneficial to realizing the wide viewing angle light emission of the wide viewing angle light emitting part 4.
The second convex structure 63 has a semicircular sectional shape parallel to the height direction thereof. The cross-sectional shape of the second convex structure 63 parallel to the height direction thereof may be a semi-elliptical shape, a triangular shape, a trapezoidal shape, or other shapes. In short, the second concave structure 64 is only required to enable the light emitted from the light emitting layer 10 to be refracted and reflected and then emitted within a smaller range of the emission angle, which is beneficial to realizing the narrow-viewing-angle light emission of the narrow-viewing-angle light emitting part 5.
In this embodiment, it is preferable that the refractive index of the insulating layer 6 of the wide-viewing-angle light-emitting section 4 is larger than the refractive index of the light-emitting layer 10; the refractive index of the insulating layer 6 of the narrow viewing angle light emitting part 5 is smaller than that of the light emitting layer 10. In the insulating layer 6 of the wide-angle light-emitting part 4, when light in different directions reaches the insulating layer 6, the light is reflected by the law of refraction ninsinαin＝noutsinαoutIt is known that the emission angle is larger than the incident angle, and the wide-angle light emission of the wide-angle light emitting unit 4 can be realized more favorably; similarly, the insulating layer 6 of the narrow-viewing-angle light-emitting part 5 has a smaller exit angle than incident angle, as is known from the law of refraction, and thus the narrow-viewing-angle light-emitting part 5 can emit light with a better narrow viewing angle.
In addition, the height range of the insulating layer 6 of the wide-viewing-angle light-emitting part 4 is 0 μm to 1 μm, and the included angle θ between the bottom surface of the larger area of the insulating layer 6 and the inclined surface is as small as possible, so that the emission angles of the light emitted by the two inclined edges of the trapezoidal section of the light-emitting layer 10 can be increased, the viewing angle contrast of the light is increased, and the wide-viewing-angle light emission of the wide-viewing-angle light-emitting part 4 is more. The height range of the insulating layer 6 of the narrow-viewing-angle light-emitting part 4 is 0.5-4 μm, and the included angle theta between the bottom surface of the larger area of the insulating layer 6 and the inclined surface is as small as possible, so that the emission angles of light emitted by two inclined edges of the trapezoidal section of the light-emitting layer 10 can be reduced, and the viewing angle contrast of light is reduced, for example, the viewing angle contrast is smaller than 10:1 under the condition of a large viewing angle, and the narrow-viewing-angle light-emitting part 5 can emit light with a narrow viewing angle.
In this embodiment, it is preferable that the anode layers 7 of the wide-viewing-angle light-emitting part 4 and the narrow-viewing-angle light-emitting part 5 are made of ITO; MoO is used as the hole injection layer 83、WO3Or V2O5(ii) a The hole transport layer 9 is made of a mixed material of TPD and NPB; the luminescent layer 10 adopts organic matter main body CBP or PVK material doped with fluorescent and phosphorescent materials; the light reflecting layer 11 is made of silver or aluminum; the electron transport layer 12 adopts pyridine or phosphine oxide doped with Alq3, BCP or TBPI; the electron injection layer 13 is made of Li or Cs2O3TiOx or MnO; the cathode layer 14 adopts Mg, Al, Ag or alloy thereof; the insulating layer 6 of the wide-view light-emitting part 4 is made of MQ silicone; the insulating layer 6 of the narrow viewing angle light-emitting part 5 is made of a composite material containing fluorine-containing silicon oxide.
The selection of the materials of the film layers is beneficial to better realize the wide-view-angle light emission of the wide-view-angle light emitting part 4 and the narrow-view-angle light emission of the narrow-view-angle light emitting part 5 after the light emitted by the light emitting layer 10 is refracted and reflected by the film layers, so that the wide-view-angle display and the narrow-view-angle display of the organic electroluminescent display panel are favorably realized.
Further preferably, in the present embodiment, in the wide-viewing-angle light emitting part 4, the thickness of the light emitting layer 10 is 0.3 to 1 μm, the thickness of each of the anode layer 7 and the cathode layer 14 is 0.3 to 0.5 μm, the thickness of each of the hole injection layer 8 and the hole transport layer 9 is 0.2 to 0.5 μm, the thickness of each of the electron transport layer 12 and the electron injection layer 13 is 0.2 to 0.5 μm, and the thickness of the light reflecting layer 11 is 0.1 μm. In the narrow viewing angle light emitting part 5, the thickness of the light emitting layer 10 is 0.3 to 1 μm, the thickness of the anode layer 7 and the cathode layer 14 is 0.2 to 0.4 μm, the thickness of the hole injection layer 8 and the hole transport layer 9 is 0.2 to 0.4 μm, the thickness of the electron transport layer 12 and the electron injection layer 13 is 0.2 to 0.4 μm, and the thickness of the light reflecting layer 11 is 0.1 μm. The thickness of each film layer is set to be beneficial to better realize the wide-viewing-angle light emission of the wide-viewing-angle light emitting part 4 and the narrow-viewing-angle light emission of the narrow-viewing-angle light emitting part 5 after the light emitted by the light emitting layer 10 is refracted and reflected by each film layer, thereby being beneficial to realizing the wide-viewing-angle display and the narrow-viewing-angle display of the organic electroluminescent display panel.
In this embodiment, the cathode layers 14 of the wide-viewing-angle light-emitting part 4 and the narrow-viewing-angle light-emitting part 5 are shared and connected to the same cathode signal in one pixel unit; as shown in fig. 4, it is assumed that two wide viewing angle light emitting sections 4 and two narrow viewing angle light emitting sections 5 are provided in one pixel unit, and the wide viewing angle light emitting sections 4 and the narrow viewing angle light emitting sections 5 are provided in the wide viewing angle display region and the narrow viewing angle display region, respectively. The driving circuit includes a first driving tube 15 for driving the wide viewing angle light emitting section 4 and a second driving tube 16 for driving the narrow viewing angle light emitting section 5; in one pixel unit, the anode layers of the multiple wide-viewing-angle light-emitting parts 4 are connected with the drain electrode of the same first driving tube 15; the anode layers of the multiple narrow viewing angle light-emitting parts 5 are connected with the drain electrode of the same second driving tube 16; in one pixel unit, the grid electrode of the first driving tube 15 and the grid electrode of the second driving tube 16 are connected with the same grid line 17, and the source electrode of the first driving tube 15 and the source electrode of the second driving tube 16 are connected with the same data line 18.
Preferably, in this embodiment, the threshold voltage of the second driving tube 16 is smaller than the threshold voltage of the first driving tube 15. So set up, when showing the drive, the preferential drive be narrow visual angle display area, because narrow visual angle display area only has half the display aperture ratio, so can not only satisfy viewer's viewing effect, can reach the purpose of energy saving moreover. When the wide viewing angle display area is driven, the wide viewing angle display area and the narrow viewing angle display area can be opened together only by increasing the driving voltage of the gate line 17, so that the display contrast of the main viewing angle of the display panel is increased, and the viewing requirement under a large viewing angle can be met. The two driving tubes are connected with the same data line 18, and when the grid line 17 is opened, the same driving voltage is input to achieve the purpose that one pixel displays the same content, and redundant driving design is not needed. The design of two drive tubes can realize the pixel level individual drive in wide visual angle display area and the narrow visual angle display area in the pixel unit, can provide selectivity privacy content protection to the display screen, makes peripheral viewer watch the content that the controller wanted to watch, realizes intelligent control.
It should be noted that the first driving tube 15 and the second driving tube 16 may also be respectively connected to the two gate lines 17 and the two data lines 18, and the same or different data signals are input to the two data lines 18, and driving voltages with different magnitudes are input to the two gate lines 17, so as to realize independent driving of the wide viewing angle light emitting part 4 and the narrow viewing angle light emitting part 5, and also provide selective privacy content protection for the display screen, so that the surrounding viewers can view the content that the controller wants to view, and realize intelligent control.
In this embodiment, the preparation process of the organic electroluminescent display panel adopts a conventional preparation process, for example, the wide viewing angle light emitting part and the narrow viewing angle light emitting part are prepared by a conventional evaporation process, and the driving circuit is prepared by a conventional composition process, which is not described in detail again.
Based on the above structure of the organic electroluminescent display panel, the present embodiment further provides a driving method of the organic electroluminescent display panel, including:
driving a narrow viewing angle light emitting part of the narrow viewing angle display area to emit light, and realizing narrow viewing angle display of the organic electroluminescent display panel;
the wide-viewing-angle light emitting part of the wide-viewing-angle display area is driven to emit light, and wide-viewing-angle display of the organic electroluminescence display panel is achieved.
The driving method can realize the separate driving of the wide-view-angle light emitting part and the narrow-view-angle light emitting part in one pixel unit, thereby providing selective privacy content protection for a display picture, enabling surrounding viewers to view the content which the controller wants to view, and realizing intelligent control.
Preferably, in this embodiment, when the organic electroluminescence display panel is driven by a lower driving voltage, the narrow viewing angle light emitting part in the narrow viewing angle display region is driven to emit light, so as to realize narrow viewing angle display of the organic electroluminescence display panel; when the organic electroluminescence display panel is driven by a higher driving voltage, the wide-viewing-angle light emitting part of the wide-viewing-angle display area and the narrow-viewing-angle light emitting part of the narrow-viewing-angle display area are driven to emit light at the same time, and the wide-viewing-angle display and the narrow-viewing-angle display of the organic electroluminescence display panel are realized at the same time.
The driving method can realize that the narrow visual angle display area has only half of the display aperture ratio when the narrow visual angle display area is preferentially driven, thereby not only meeting the watching effect of a watcher, but also achieving the purpose of saving energy; when the wide visual angle display area is driven subsequently, the wide visual angle display area and the narrow visual angle display area can be opened together only by increasing the driving voltage, so that the display contrast of the main visual angle of the display panel is increased, the viewing requirement under a large viewing angle can be met, and redundant driving design is not needed on a driving circuit.
The display panel provided by the invention can be any product or component with a self-luminous display function, such as an OLED panel, an OLED television, a display, a mobile phone, a navigator and the like.
The invention has the beneficial effects that: according to the organic electroluminescence display panel provided by the invention, the pixel unit is divided into the wide visual angle display area and the narrow visual angle display area, the light emitting structure in the pixel unit is set into the wide visual angle light emitting part and the narrow visual angle light emitting part, and meanwhile, the driving circuit is arranged, so that the wide visual angle light emitting part and the narrow visual angle light emitting part in the pixel unit can be respectively driven, the wide visual angle display and the narrow visual angle display of the display panel are realized, and the requirement of people on the privacy and confidentiality display function of the organic electroluminescence display panel is further met.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (11)
1. The utility model provides an organic electroluminescence display panel, includes the basement and sets up pixel element on the basement, pixel element includes light emitting structure and drive circuit, its characterized in that, pixel element divides into wide visual angle display area and narrow visual angle display area, light emitting structure includes wide visual angle illuminating part and narrow visual angle illuminating part, wide visual angle illuminating part set up in the wide visual angle display area, narrow visual angle illuminating part set up in the narrow visual angle display area, drive circuit can drive respectively wide visual angle illuminating part with narrow visual angle illuminating part is luminous, in order to realize display panel's wide visual angle shows and narrow visual angle shows.
2. The organic electroluminescent display panel according to claim 1, wherein one of the pixel units includes a plurality of the wide viewing angle display regions and a plurality of the narrow viewing angle display regions, and the wide viewing angle display regions and the narrow viewing angle display regions are alternately arranged;
the wide-view light emitting part is in a shape of a regular step, and the narrow-view light emitting part is in a shape of an inverted step; the adjacent wide-viewing-angle light emitting parts and the narrow-viewing-angle light emitting parts are mutually butted;
the wide-view-angle light emitting part and the narrow-view-angle light emitting part respectively comprise an insulating layer, an anode layer, a hole injection layer, a hole transport layer, a light emitting layer, a light reflection layer, an electron transport layer, an electron injection layer and a cathode layer which are sequentially far away from the substrate.
3. The organic electroluminescence display panel according to claim 2, wherein cathode layers of the wide viewing angle light emitting section and the narrow viewing angle light emitting section are common and connected to the same cathode signal in one pixel unit;
the driving circuit comprises a first driving tube for driving the wide viewing angle light emitting part and a second driving tube for driving the narrow viewing angle light emitting part; in one pixel unit, the anode layers of the multiple wide-viewing-angle light-emitting parts are connected with the drain electrode of the same first driving tube; the anode layers of the plurality of narrow viewing angle light-emitting parts are connected with the drain electrode of the same second driving tube;
in one pixel unit, the grid electrode of the first driving tube and the grid electrode of the second driving tube are connected with the same grid line, and the source electrode of the first driving tube and the source electrode of the second driving tube are connected with the same data line.
4. The panel of claim 2, wherein the insulating layer of the wide-angle light-emitting part has an inverted trapezoidal shape, a plurality of first concave structures are formed on a side of the insulating layer of the wide-angle light-emitting part facing away from the substrate, a plurality of first convex structures are formed on a side of the anode layer, the hole injection layer, the hole transport layer, and the light-emitting layer of the wide-angle light-emitting part facing away from the substrate, respectively, and the first convex structures correspond to the first concave structures in position and are adapted to the first concave structures in size and shape;
the insulating layer of narrow visual angle illuminating part is the shape of an inverted terrace, the insulating layer of the narrow visual angle illuminating part deviates from a plurality of second convex structures are formed on the side face of the substrate, a plurality of second concave structures are formed on the side face of the substrate respectively, and the second concave structures correspond to the positions of the second convex structures and are matched in size and shape.
5. The panel of claim 4, wherein the first concave structures are uniformly distributed in the same size and shape, the maximum depth of the first concave structure is half of the thickness of the insulating layer of the wide-angle light-emitting part, and the distance between two adjacent first concave structures is the maximum opening width of the first concave structure;
the second convex structures are the same in size and shape and are uniformly distributed, the maximum height of each second convex structure is half of the thickness of the insulating layer of the narrow-view-angle light-emitting part, and the spacing distance between every two adjacent second convex structures is the maximum width of the second convex structures perpendicular to the height direction of the second convex structures.
6. The organic electroluminescent display panel according to claim 5, wherein a cross-sectional shape of the first concave structure parallel to a depth direction thereof is a semicircle, a semi-ellipse, a triangle, or a trapezoid;
the section of the second convex structure parallel to the height direction is semicircular, semi-elliptical, triangular or trapezoidal.
7. The organic electroluminescent display panel according to claim 2, wherein a refractive index of the insulating layer of the wide-viewing-angle light-emitting part is larger than a refractive index of the light-emitting layer thereof;
the refractive index of the insulating layer of the narrow viewing angle light emitting part is smaller than that of the light emitting layer.
8. The organic electroluminescent display panel according to claim 2, wherein the anode layers of the wide-viewing-angle light-emitting part and the narrow-viewing-angle light-emitting part are made of ITO material; the hole injection layer adopts MoO3、WO3Or V2O5(ii) a The hole transport layer is made of a mixed material of TPD and NPB; the luminescent layer adopts organic matter main body CBP or PVK material doped with fluorescent and phosphorescent materials; the light reflecting layer is made of silver or aluminum; the electron transport layer adopts pyridine or phosphine oxide doped with Alq3, BCP or TBPI; the electron injection layer adopts Li and Cs2O3TiOx or MnO; the cathode layer adopts Mg, Al, Ag or the alloy thereof;
the insulating layer of the wide-view light emitting part adopts MQ silicon resin; the insulating layer of the narrow-viewing-angle light-emitting part is made of a composite material containing fluorine and silicon oxide.
9. The organic electroluminescent display panel according to claim 3, wherein the threshold voltage of the second driving tube is smaller than the threshold voltage of the first driving tube.
10. A driving method of the organic electroluminescent display panel according to any one of claims 1 to 9, comprising:
driving a narrow viewing angle light emitting part of the narrow viewing angle display area to emit light, and realizing narrow viewing angle display of the organic electroluminescent display panel;
the wide-viewing-angle light emitting part of the wide-viewing-angle display area is driven to emit light, and wide-viewing-angle display of the organic electroluminescence display panel is achieved.
11. The method of claim 10, wherein the narrow viewing angle light emitting part of the narrow viewing angle display region is driven to emit light at a lower driving voltage to realize narrow viewing angle display of the organic electroluminescent display panel;
when the organic electroluminescence display panel is driven by a higher driving voltage, the wide-viewing-angle light emitting part of the wide-viewing-angle display area and the narrow-viewing-angle light emitting part of the narrow-viewing-angle display area are driven to emit light at the same time, and the wide-viewing-angle display and the narrow-viewing-angle display of the organic electroluminescence display panel are realized at the same time.
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