CN111429844B - Display panel and display device - Google Patents
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- CN111429844B CN111429844B CN202010361343.6A CN202010361343A CN111429844B CN 111429844 B CN111429844 B CN 111429844B CN 202010361343 A CN202010361343 A CN 202010361343A CN 111429844 B CN111429844 B CN 111429844B
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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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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Abstract
Disclosure of the inventionThe utility model provides a display panel and display device, relates to and shows technical field, includes: the display device comprises a display area and a non-display area, wherein the display area comprises a plurality of pixel units, and each pixel unit comprises a first sub-pixel emitting first color light, a second sub-pixel emitting second color light and a third sub-pixel emitting third color light; in each pixel unit, under the same gray scale, the working voltage of the first sub-pixel is V1The working voltage of the second sub-pixel is V2The working voltage of the third sub-pixel is V3Wherein V is1≤V2≤V3And, 0 is not more than V3‑V1Is less than 0.3V. The working voltage difference between the third sub-pixel with the maximum working voltage and the first sub-pixel with the minimum working voltage is set within 0.3V, so that the problem that the first sub-pixel of the display panel is stolen and brightened under the pure color display picture of the second color and the third color is favorably solved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
The display technology, which is an important component of the information industry, plays an important role in the development process of the information technology, and the support of the display technology cannot be separated from the display technology, such as televisions, notebooks, and mobile phones and tablets. With the development of scientific technology, display technology has also been developed from the original Cathode Ray Tube (CRT) display technology to the Flat Panel Display (FPD), which further extends the technical lines of Plasma Display (PDP), Liquid Crystal Display (LCD), Organic Light Emitting Diode (OLED), micro-led display, etc.
An OLED (organic light-Emitting Diode) is an organic electroluminescent device including a relatively special organic light-Emitting material. Under the action of an electric field, holes generated by an anode and electrons generated by a cathode move, are respectively injected into a hole transport layer and an electron transport layer, and migrate to an organic light emitting material layer. When the two materials meet each other in the organic light-emitting material layer, energy excitons are generated, so that light-emitting molecules are excited to finally generate visible light, and self-luminescence is realized. In order to realize color display, the OLED display panel has different organic light emitting materials, for example, an organic light emitting material for displaying red and an organic light emitting material for displaying blue, and the operating voltages of the sub-pixels of different colors are different due to the different materials. For example, when the operating voltage corresponding to the red pixel is lower than that of the blue pixel and the green pixel, there is a problem of lighting stealing when the low-gray-scale monochrome picture is lit, that is, the red pixel emits light weakly (hereinafter, referred to as lighting stealing) in the blue or green monochrome picture, thereby affecting the display effect of the display panel.
Therefore, a display panel with improved pixel stealing is needed to improve the display effect of the display panel.
Disclosure of Invention
In view of this, the present invention provides a display panel and a display device, in which a difference between an operating voltage of a third sub-pixel with a maximum operating voltage and an operating voltage of a first sub-pixel with a minimum operating voltage is set within 0.3V, which is beneficial to improving the problem that the first sub-pixel is stolen and brightened when the display panel displays a pure color display image with a second color and a third color.
In a first aspect, the present application provides a display panel, a display area and a non-display area, wherein the display area includes a plurality of pixel units, each of the pixel units includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light;
in each pixel unit, under the same gray scale, the working voltage of the first sub-pixel is V1The working voltage of the second sub-pixel is V2The working voltage of the third sub-pixel is V3Wherein V is1≤V2≤V3And, 0 is not more than V3-V1＜0.3V。
In a second aspect, the present application provides a display device including the display panel provided by the present application.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
in the display panel and the display device provided by the invention, each pixel unit on the display panel respectively comprises a first sub-pixel for emitting first color light, a second sub-pixel for emitting second color light and a third sub-pixel for emitting third color light, under the same gray scale, the working voltage of the first sub-pixel is less than or equal to the working voltage of the second sub-pixel, the working voltage of the second sub-pixel is less than the working voltage of the third sub-pixel, according to the acceptance degree of the actual brightness stealing degree of the current product, when the working voltage difference between the third sub-pixel with the maximum working voltage and the first sub-pixel with the minimum working voltage is set within 0.3V, the problem that the first sub-pixel of the display panel is brightened under the pure color display pictures of the second color and the third color is favorably improved, and the problem that the white picture deviates from the first color under the condition of low-gray level white picture display is favorably improved, therefore, the display effect of the display panel and the display device can be improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a top view of a display panel according to an embodiment of the present disclosure;
FIG. 2 is an AA' cross-sectional view of the display panel of FIG. 1;
fig. 3 is a circuit diagram of a pixel unit in a display panel according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram showing the relationship between the ratio of the area of the third sub-pixel opening to the area of the first sub-pixel opening and the intensity of light in a pure blue display screen;
fig. 5 is a schematic circuit diagram of a pixel unit in a display panel according to an embodiment of the present disclosure;
FIG. 6 is a diagram showing a relationship between an actual aperture ratio of a first sub-pixel and a light intensity of a pure green display frame;
FIG. 7 is a diagram showing a relationship between an actual aperture ratio of a first sub-pixel and a light intensity of a pure blue display screen;
fig. 8 is a schematic layout diagram of a pixel unit in a display panel according to an embodiment of the present disclosure;
fig. 9 is a schematic view of a display device according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the related art OLED display panel, sub-pixels emitting light of different colors are included, and an organic light emitting material is disposed in the sub-pixels, thereby realizing self-luminescence. Generally, the organic light emitting materials corresponding to the sub-pixels emitting light of different colors are different, and the operating voltages corresponding to the sub-pixels emitting light of different colors are different under the same gray scale, wherein in a common case, the operating voltage corresponding to the red sub-pixel is the lowest, the operating voltage corresponding to the blue sub-pixel is the highest, and the operating voltage corresponding to the green sub-pixel is centered under the same gray scale. Therefore, in a blue or green pure color display frame, the red sub-pixel may have a weak light emission phenomenon, that is, the red sub-pixel may have a stealing light phenomenon, which affects the display effect of the blue display frame and the green display frame. Moreover, due to the existence of the stealing brightness, when the stealing brightness degree of the red sub-pixel meets the color matching requirement of the white picture under the display of the blue picture and the green picture in the low gray scale display, the stealing brightness of the red sub-pixel can cause the problem that the low gray scale white display picture is reddish, thereby affecting the display effect of the display panel.
In view of this, the present invention provides a display panel and a display device, in which a difference between an operating voltage of a third sub-pixel with a maximum operating voltage and an operating voltage of a first sub-pixel with a minimum operating voltage is set within 0.3V, which is beneficial to improving the problem that the first sub-pixel is stolen and brightened when the display panel displays a pure color display image with a second color and a third color.
The invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a top view of a display panel according to an embodiment of the present disclosure, fig. 2 is an AA' cross-sectional view of the display panel of fig. 1, fig. 3 is a circuit diagram of a pixel unit of the display panel according to the embodiment of the present disclosure, and referring to fig. 1 to fig. 3, a display panel 100 according to the present disclosure includes a display area 11 and a non-display area 12, wherein the display area 11 includes a plurality of pixel units 40, and each of the pixel units 40 includes a first sub-pixel 41 emitting a first color light, a second sub-pixel 42 emitting a second color light, and a third sub-pixel 43 emitting a third color light, respectively;
in each pixel unit 40, the operating voltage of the first sub-pixel 41 is V at the same gray level1The operating voltage of the second sub-pixel 42 is V2The working voltage of the third sub-pixel 43 is V3Wherein V is1≤V2≤V3And, 0 is not more than V3-V1＜0.3V。
It should be noted that fig. 1 only schematically illustrates one shape of the display panel 100, and in some other embodiments of the present application, the display panel 100 may be embodied as a circle, an ellipse, or another irregular structure besides a rectangle, and the present application does not specifically limit the shape of the display panel 100. In addition, the top view of fig. 1 also only illustrates the arrangement of the sub-pixels, and does not limit the actual arrangement of the sub-pixels. The shape, structure, and size of the sub-pixels shown on the display panel 100 are also schematic, and are not limited in practice.
It should be noted that fig. 2 is only a schematic diagram of the film layer structure on the display panel 100, and does not represent the actual number and size of the film layers. Referring to fig. 2, the display panel 100 includes a substrate 10, an array layer 20 disposed on one side of the substrate 10, and a light emitting unit 30 disposed on one side of the array layer 20 away from the substrate 10, wherein the light emitting unit 30 generally includes a first electrode layer 31, an organic light emitting material layer 32, and a second electrode layer 33 stacked in a direction perpendicular to the substrate 10, and the first electrode layer 31 is electrically connected to a driving transistor in the array layer 20 and receives a voltage signal transmitted by the driving transistor. In general, the second electrode layers 33 corresponding to the light emitting units 30 in the display panel 100 are commonly used, that is, the second electrode layers 33 are located on the same film layer and electrically connected to each other for receiving a fixed voltage signal, and an organic common layer (not shown) is usually further included between the first electrode layer 31 and the second electrode layers 33, and the organic common layer of each pixel is usually located on the same film layer and connected to each other. When a voltage is transmitted to the first electrode layer 31 and the second electrode layer 33, holes generated from the first electrode layer 31 and electrons generated from the cathode move to the organic light emitting material layer 32, and when the holes and the electrons meet at the organic light emitting material layer 32, energy excitons are generated, thereby exciting light emitting material molecules to finally generate visible light. The light emitting unit 30 in fig. 2 corresponds to one of the first sub-pixel 41, the second sub-pixel 42, and the third sub-pixel 43 in the present application.
Fig. 3 is a schematic circuit diagram of a first sub-pixel 41, a second sub-pixel 42, and a third sub-pixel 43 of a pixel unit 40, in which one light emitting unit 30 corresponds to one sub-pixel, and optionally, one light emitting unit 30 is included in each of the first sub-pixel 41, the second sub-pixel 42, and the third sub-pixel 43. The cathode 52 of the light emitting unit 30 receives a fixed voltage signal, for example, ground, and the anode 51 of the light emitting unit 30 is used to electrically connect with the driving transistor in the pixel driving circuit and receive the operating voltage sent by the pixel driving circuit, that is, the operating voltage of the sub-pixel mentioned in this application may be, for example, the voltage supplied to the anode 51 of the light emitting unit 30 corresponding to the sub-pixel. Alternatively, the anode 51 in the embodiment shown in fig. 3 may correspond to the first electrode layer 31 in fig. 2, and the cathode 52 may correspond to the second electrode layer 33 in fig. 2. Due to the arrangement of the actual film structure, the light emitting unit 30 corresponding to the first sub-pixel 41 and the light emitting unit 30 corresponding to the second sub-pixel 42 have different working voltages, a part of current may flow to the light emitting unit with lower voltage through the connected common film, a certain leakage phenomenon may exist between different pixels, and a certain leakage phenomenon may also exist between the light emitting unit 30 corresponding to the first sub-pixel 41 and the light emitting unit 30 corresponding to the second sub-pixel 42. Since the operating voltage of the first sub-pixel 41 is the minimum, the current of the anode 51 of the light-emitting unit 30 corresponding to the second sub-pixel 42 or the third sub-pixel 43 may flow to the anode 51 of the light-emitting unit 30 corresponding to the first sub-pixel 41 in the pure color screen display of the second color or the third color, and when the operating voltage of the third sub-pixel 43 is the maximum, the leakage current from the anode 51 of the light-emitting unit 30 corresponding to the third sub-pixel 43 to the anode 51 of the light-emitting unit 30 corresponding to the first sub-pixel 41 in the pure color screen display of the third color is larger, and the leakage current may cause the phenomenon of the first sub-pixel 41 being stolen and bright, thereby affecting the display effect.
In contrast, in the present application, the voltage difference between the operating voltages corresponding to the first sub-pixel 41 and the third sub-pixel 43 is adjusted to make the voltage difference between the operating voltage of the third sub-pixel 43 and the operating voltage of the first sub-pixel 41 less than 0.3V, so that, when displaying a pure color image, for example, when displaying a third color image, even though the current flowing through the anode 51 of the light-emitting unit 30 corresponding to the third sub-pixel 43 may flow to the anode 51 of the light-emitting unit 30 corresponding to the first sub-pixel 41, because the voltage difference between the third sub-pixel 43 and the first sub-pixel 41 is small, the current flowing through the anode 51 of the light-emitting unit 30 corresponding to the first sub-pixel 41 will be small, and the current will not be enough to drive the light-emitting unit 30 corresponding to the first sub-pixel 41 to emit light, and therefore, the first sub-pixel 41 will not be illuminated under the third color display image. Considering that the operating voltage corresponding to the second sub-pixel 42 is equal to or less than the operating voltage corresponding to the third sub-pixel 43, even though the current of the anode 51 of the light-emitting unit 30 corresponding to the second sub-pixel 42 may flow to the anode 51 of the light-emitting unit 30 corresponding to the first sub-pixel 41 in the second color display state, the current is not enough to drive the light-emitting unit 30 corresponding to the first sub-pixel 41 to emit light, and therefore, the first sub-pixel 41 does not appear to be stolen under the second color screen display. Therefore, according to the present application, the operating voltage difference between the third subpixel 43 with the largest operating voltage and the first subpixel 41 with the smallest operating voltage is set within 0.3V, which is beneficial to improving the problem that the first subpixel 41 is stolen under the pure color display screen of the second color and the third color. It should be noted that, in an alternative embodiment of the present invention, the difference between the operating voltages of the third sub-pixel 43 and the first sub-pixel 41 may be, for example, 0.25V, 0.2V, 0.15V, 0.1V, or even 0V, and the smaller the difference between the operating voltages of the third sub-pixel and the first sub-pixel is, the more beneficial to improving the problem of the first sub-pixel 41 being stolen.
In an alternative embodiment of the present invention, the first sub-pixel 41 comprises a first sub-pixel opening, the second sub-pixel 42 comprises a second sub-pixel opening, and the third sub-pixel 43 comprises a third sub-pixel opening; wherein, in the same pixel unit 40, the area of the first sub-pixel opening is S1The area of the third sub-pixel opening is S3，S1＜S3。
Specifically, with reference to fig. 2, a pixel defining layer 34 is disposed in the display panel 100, where the pixel defining layer 34 defines, for each sub-pixel, a region for filling a luminescent material layer, where the region corresponds to a sub-pixel opening, and when the sub-pixel emits light, the light is emitted from the region corresponding to the pixel opening to the light exit surface of the display panel 100, that is, the sub-pixel opening refers to a region of the display panel 100 through which the light corresponding to the sub-pixel can pass. In the display panel 100 provided by the present application, the area of the first sub-pixel opening is set to be smaller than the area of the third sub-pixel opening, and at this time, the area of the first sub-pixel opening may be reduced and/or the area of the third sub-pixel opening may be increased, and when the area of a certain sub-pixel opening is reduced, the corresponding operating voltage may be increased; when the area of a certain sub-pixel opening is increased, the corresponding working voltage is reduced. Therefore, when the area of the first sub-pixel opening is reduced and/or the area of the third sub-pixel opening is increased, the operating voltage corresponding to the first sub-pixel 41 is increased, or the operating voltage corresponding to the third sub-pixel 43 is reduced, so that the voltage difference between the operating voltages of the third sub-pixel 43 and the first sub-pixel 41 is reduced, and when the voltage difference between the operating voltages of the third sub-pixel and the first sub-pixel is reduced, when the third color image is displayed, the leakage current from the anode of the light emitting unit 30 corresponding to the third color sub-pixel to the anode of the light emitting unit 30 corresponding to the first color sub-pixel is reduced, thereby being beneficial to reducing the phenomenon that the light emitting unit 30 corresponding to the first color sub-pixel is stolen to be bright due to the leakage current, and being beneficial to improving the display effect of the display panel 100.
In an alternative embodiment of the invention, S3/S1Not less than 1.5: 1. Specifically, when the ratio of the areas of the third sub-pixel opening and the first sub-pixel opening is set to be less than 1.5:1, the voltage difference of the operating voltage between the third sub-pixel 43 and the first sub-pixel 41 is not sufficiently small, so that the first sub-pixel 41 may still have a phenomenon of sneak under the third color screen display. Therefore, when the ratio of the areas of the third sub-pixel opening and the first sub-pixel opening is set to be greater than or equal to 1.5:1, that is, the area of the third sub-pixel opening is at least 1.5 times of the area of the first sub-pixel opening, the voltage difference of the operating voltage between the third sub-pixel 43 and the first sub-pixel 41 can be made small enough on the basis of being smaller than 0.3V, so that the phenomenon that the first sub-pixel 41 is stolen during the display of the third color picture is avoided to the greatest extent, and therefore the design of the third sub-pixel opening and the first sub-pixel opening is realized in such a wayIn this way, the display effect of the display panel 100 is improved.
The area ratio of the third sub-pixel aperture to the first sub-pixel aperture and the corresponding light intensity will be described with reference to fig. 4, assuming that the first sub-pixel is a red light emitting sub-pixel and the third sub-pixel is a blue light emitting sub-pixel, fig. 4 is a schematic diagram illustrating the relationship between the area ratio of the third sub-pixel aperture to the first sub-pixel aperture and the light intensity in a pure blue display frame, wherein the dashed line represents S3/S1The solid line represents S when the intensity is 1:0.93/S1When the light intensity is 1.8:1, it can be seen that S is present in the wavelength range of 600nm to 700nm3/S1The height of the peak corresponding to 1:0.9 is larger than S3/S1Peak height of 1.8:1, i.e. S in a pure blue display3/S1When the red light intensity is larger than 1:0.9, the leakage current corresponding to the sub-pixel emitting red light is more serious; and S3/S1When the red light intensity is smaller than 1.8:1, the leakage current corresponding to the sub-pixel emitting red light is not obvious. Therefore, when the ratio of the area of the third sub-pixel opening to the area of the first sub-pixel opening is S3/S1When the ratio is 1.8:1, the phenomenon of leakage of the sub-pixel emitting red light in a pure blue display picture is favorably obviously improved, and the inventor finds that when S is used for research, the leakage of the sub-pixel emitting red light in the pure blue display picture is obviously improved3/S1The ratio of 1.5:1 or more can effectively improve the phenomenon of leakage of the sub-pixels which emit red light in a pure blue display picture, and the display effect of the display panel is improved.
In an alternative embodiment of the present invention, the opening area of the second sub-pixel 42 is S2Wherein S is1＜S2＜S3。
Specifically, when the area of the opening of the second sub-pixel 42 is set to be larger than the area of the opening of the first sub-pixel 41, it is equivalent to decrease the area of the opening of the first sub-pixel 41 or increase the area of the opening of the second sub-pixel 42, and when the area of the opening of the second sub-pixel 42 is increased, the increase of the area of the opening of the second sub-pixel 42 is made to be smaller than the area of the opening of the third sub-pixel 43. When the area of the opening of the first sub-pixel 41 is reduced, the corresponding operating voltage of the first sub-pixel 41 will increase; when the area of the opening of the second sub-pixel 42 is increased, the corresponding operating voltage of the second sub-pixel 42 is decreased. Therefore, the working voltage difference between the second sub-pixel 42 and the first sub-pixel 41 is reduced, the difference is smaller than the working voltage difference between the third sub-pixel 43 and the first sub-pixel 41, and even if a leakage current flows from the anode of the light emitting unit 30 corresponding to the second sub-pixel 42 to the anode of the light emitting unit 30 corresponding to the first sub-pixel 41 in the second color display picture, the leakage current does not cause the first sub-pixel 41 to emit light, so that the phenomenon that the first sub-pixel 41 is stolen and lighted in the second color display picture is effectively avoided, and the display effect of the display panel 100 is also improved.
In an alternative embodiment of the present invention, fig. 5 is a circuit schematic diagram of a pixel unit 40 in the display panel 100 according to the embodiment of the present invention, please refer to fig. 5, in which the first sub-pixel 41 includes a first light emitting unit 301, a first electrode layer 31 of the first light emitting unit 301 is electrically connected to a first fixed voltage terminal (e.g., a ground terminal), and a second electrode layer 33 is connected to a first sub-node N1; the second sub-pixel 42 includes a second light emitting unit 302, the first electrode layer 31 of the second light emitting unit 302 is electrically connected to the first fixed voltage terminal (e.g., ground), and the second electrode layer 33 is connected to the second sub-node N2; the third sub-pixel 43 includes a third light emitting unit 303, the first electrode layer 31 of the third light emitting unit 303 is electrically connected to the first fixed voltage terminal (e.g., ground), and the second electrode layer 33 is connected to the third sub-node N3.
Specifically, please refer to fig. 5, the first sub-node N1 of the first light emitting unit 301, the second sub-node N2 of the second light emitting unit 302, and the third sub-node N3 of the third light emitting unit 303 are electrically connected to a pixel driving circuit, which can specifically refer to a pixel driving circuit for driving sub-pixels to emit light in the prior art, and the description of the pixel driving circuit is omitted here. The pixel driving circuit is configured to generate a driving current, which is provided to the first sub-node N1, the second sub-node N2, or the third sub-node N3, so as to drive the first light emitting unit 301, the second light emitting unit 302, or the third light emitting unit 303 to emit light. Since the operating voltage of the first sub-pixel 41 is the lowest, when a part of the driving current of the second sub-node N2 or the third sub-node N3 flows to the first sub-node N1 in the display image of the second color or the third color, the difference between the operating voltage of the third sub-pixel 43 and the operating voltage of the first sub-pixel 41 is set to be less than 0.3V, and since the operating voltage of the second sub-pixel 42 is less than or equal to the operating voltage of the third sub-pixel 43, the difference between the operating voltages of the second sub-pixel 42 and the first sub-pixel 41 is necessarily less than 0.3V, so even if a leakage flows from the third sub-node N3 or the second sub-node N2 to the first sub-node N1, the leakage will be small and will not drive the first light emitting unit 301 to emit light, thereby avoiding the phenomenon that the first sub-pixel 41 is bright in the display image of the second color or the third color, it is beneficial to improve the display effect of the display panel 100.
In an alternative embodiment of the present invention, referring to fig. 5, when the first light emitting unit 301 emits light, the relationship between the voltage of the first sub-node N1 and the actual aperture ratio of the first sub-pixel 41 is: vR0＝VR3+(VR1-VR3)*(A3-A2)/(A3-A1) Wherein, VR0Is the actual operating voltage value of the first sub-node N1; a. the1Is a first reference aperture ratio, A, of the first sub-pixel 412Is the actual aperture ratio of the first sub-pixel 41, A3Is a second reference aperture ratio of the first sub-pixel 41, the first reference aperture ratio and the second reference aperture ratio of the first sub-pixel 41 are known numbers, and A1＜A2＜A3；VR1When the first reference aperture ratio of the first sub-pixel 41 is A1A first reference voltage value corresponding to the first sub-node N1; vR3When the second reference aperture ratio of the first sub-pixel 41 is A3And the first reference voltage value and the second reference voltage value corresponding to the first sub-node N1 are known numbers.
Specifically, the present application introduces the above formula to represent the first sub-pixel 41 corresponding to the first sub-pixelVoltage V of sub-node N1R0In relation to the actual aperture ratio of the first sub-pixel 41, the formula utilizes two reference aperture ratios (first reference aperture ratio A, respectively) of the first sub-pixel 411And a second reference aperture ratio A3) And reference voltage values (first reference voltage values V, respectively) corresponding to the two reference aperture ratiosR1And a second reference voltage value VR3) To calculate the actual operating voltage value V of the first sub-node N1R0The actual aperture ratio A of the corresponding first sub-pixel 412And the actual aperture ratio corresponding to the first sub-pixel 41 is obtained when the difference between the operating voltages of the third sub-pixel 43 and the first sub-pixel 41 is less than 0.3V, so that the phenomenon of the first sub-pixel 41 being stolen when the second color picture or the first color picture is displayed is improved from the aspect of the aperture ratio of the first sub-pixel 41.
The relationship between the actual aperture ratio a2 of the first sub-pixel and the light intensity will be described with reference to fig. 6 and 7, assuming that the first sub-pixel is a red light emitting sub-pixel and the third sub-pixel is a blue light emitting sub-pixel, wherein fig. 6 shows a corresponding relationship between the actual aperture ratio a2 of the first sub-pixel and the light intensity in a pure green display frame, and fig. 7 shows a corresponding relationship between the actual aperture ratio a2 of the first sub-pixel and the light intensity in a pure blue display frame. It should be noted that, in the display panel based on fig. 6 and fig. 7, the relationship between the aperture ratio of the first sub-pixel and the light intensity under the display of the pure color picture is verified by only changing the aperture ratio of the first sub-pixel, and other factors are the same, for example, the distance between the apertures of the sub-pixels is the same, the thickness of each film layer is also the same, and the difference is the aperture ratio of only the first sub-pixel.
Referring to fig. 6, in the pure green display frame, in the range of the wavelength from 600nm to 700nm, when the actual aperture ratio a2 of the first sub-pixel is 4.13%, the corresponding peak height is greater than the peak height corresponding to a2 that is 3.36%, that is, in the pure green display frame, when a2 is 4.13%, the red light intensity is greater, and the leakage current corresponding to the sub-pixel emitting red light is more serious; when a2 is 3.36%, the red light intensity is low, and the leakage current corresponding to the sub-pixel emitting red light is not obvious, so that the reduction of the aperture ratio of the first sub-pixel is beneficial to improving the leakage current phenomenon of the sub-pixel emitting red light in the pure green display picture. Since the aperture ratio of the sub-pixel is in direct proportion to the aperture area of the sub-pixel, it is further verified that reducing the aperture area of the first sub-pixel is beneficial to reducing the phenomenon of leakage of the sub-pixel emitting red light in the pure green display picture.
Similarly, please refer to fig. 7, in the pure blue display screen, in the range of the wavelength from 600nm to 700nm, the peak height corresponding to a2 being 4.13% is greater than the peak height corresponding to a2 being 3.36%, that is, in the pure blue display screen, when a2 being 4.13%, the red light intensity is greater, and the leakage current corresponding to the sub-pixel emitting red light is more serious; when a2 is 3.36%, the red light intensity is low, and the leakage current corresponding to the sub-pixel emitting red light is not obvious, so that the reduction of the aperture opening ratio of the first sub-pixel is beneficial to improving the leakage current phenomenon of the sub-pixel emitting red light in the pure blue display picture. Since the aperture ratio of the sub-pixel is in direct proportion to the aperture area of the sub-pixel, it is further verified that reducing the aperture area of the first sub-pixel is beneficial to reducing the phenomenon of leakage of the sub-pixel emitting red light in the pure blue display picture.
In an alternative embodiment of the present invention, when the third light emitting unit 303 emits light, the relationship between the voltage of the third sub-node N3 and the actual aperture ratio of the third sub-pixel 43 is: vB0＝VB1+(VB1-VB3)*(B3-B2)/(B3-B1) Wherein V isB0Is the actual operating voltage value, B, of the third sub-node N31Is a first reference aperture ratio, B, of the third sub-pixel 432Is the actual aperture ratio of the third sub-pixel 43, B3Is a second reference aperture ratio of the third sub-pixel 43, the first reference aperture ratio and the second reference aperture ratio of the third sub-pixel 43 are known numbers, and B1＜B2＜B3；VB1When the first reference aperture ratio of the third sub-pixel 43 is B1A first reference voltage value corresponding to the third sub-node N3; vB3When the second reference aperture ratio of the third sub-pixel 43 is B3A second reference voltage corresponding to the third sub-node N3And the first reference voltage value and the second reference voltage value corresponding to the third sub-node are known numbers.
Specifically, the present application introduces the above formula to represent the voltage V of the third sub-node N3 corresponding to the third sub-pixel 43B0In relation to the actual aperture ratio of the third sub-pixel 43, the formula utilizes two reference aperture ratios (first reference aperture ratios B, respectively) of the third sub-pixel 431And a second reference aperture ratio B3) And reference voltage values (first reference voltage values V, respectively) corresponding to the two reference aperture ratiosB1And a second reference voltage value VB3) To calculate the actual operating voltage value V of the first sub-node N1B0The actual aperture ratio B of the corresponding first sub-pixel 412And obtaining an actual aperture ratio corresponding to the third sub-pixel 43 when the difference between the operating voltages of the third sub-pixel 43 and the first sub-pixel 41 is less than 0.3V, so as to improve the phenomenon that the first sub-pixel 41 is stolen when the second color picture or the first color picture is displayed from the aspect of the aperture ratio of the third sub-pixel 43.
In an alternative embodiment of the present invention, continuing to refer to fig. 5, within the same pixel cell 40: when the first sub-pixel 41 emits light, the light emitting efficiency of the first sub-pixel 41 is W1(ii) a When the third sub-pixel 43 emits light, the light-emitting efficiency of the third sub-pixel 43 is W3(ii) a Wherein, W1＜W3。
Specifically, when the light emitting efficiency of the first sub-pixel 41 is set to be smaller than the light emitting efficiency of the third sub-pixel 43, the present application may be implemented by decreasing the light emitting efficiency of the first sub-pixel 41 or increasing the light emitting efficiency of the third sub-pixel 43, and when the light emitting efficiency of the first sub-pixel 41 is decreased and the light emitting efficiency of the third sub-pixel 43 is kept unchanged, referring to fig. 5, the operating voltage of the first sub-node corresponding to the first sub-pixel 41 will be increased and the operating voltage of the third sub-node corresponding to the third sub-pixel 43 will be kept unchanged, so that the difference of the operating voltages between the third sub-pixel 43 and the first sub-pixel 41 will be decreased, and when a pure color image is displayed, for example, when a third color image is displayed, even though the current of the third sub-node corresponding to the third sub-pixel 43 may flow to the first sub-node corresponding to the first sub-pixel 41, but because the voltage difference between the third sub-pixel 43 and the first sub-pixel 41 is smaller, the current flowing to the first sub-node corresponding to the first sub-pixel 41 will be small, and the current will not be enough to drive the light-emitting unit 30 corresponding to the first sub-pixel 41 to emit light, so that the first sub-pixel 41 will not be illuminated under the display frame of the third color. Similarly, when the light emitting efficiency of the third sub-pixel 43 is increased and the light emitting efficiency of the first sub-pixel 41 is kept unchanged, referring to fig. 5, the operating voltage of the first sub-node corresponding to the first sub-pixel 41 is kept unchanged, and the operating voltage of the third sub-node corresponding to the third sub-pixel 43 is decreased, so that the difference of the operating voltages between the third sub-pixel 43 and the first sub-pixel 41 is also decreased, and when displaying a pure color frame, for example, displaying a third color frame, even though the current flowing to the third sub-node corresponding to the third sub-pixel 43 may flow to the first sub-node corresponding to the first sub-pixel 41, because the voltage difference between the third sub-pixel 43 and the first sub-pixel 41 is small, the current flowing to the first sub-node corresponding to the first sub-pixel 41 will be small, and the current will not be enough to drive the light emitting unit 30 corresponding to the first sub-pixel 41 to emit light, in the third color display frame, the first sub-pixel 41 will not be stolen. Of course, in some other embodiments of the present application, the stealing and lighting phenomenon of the first sub-pixel 41 under the display image of the third color can be improved by simultaneously reducing the light emitting efficiency of the first sub-pixel 41 and increasing the light emitting efficiency of the third sub-pixel 43, which is also beneficial to improving the display effect of the display panel 100.
In an alternative embodiment of the present invention, when the second sub-pixel 42 emits light, the light emitting efficiency of the second sub-pixel 42 is W2Wherein W is1＜W2＜W3。
Specifically, when the light emission efficiency of the second sub-pixel 42 is set to be higher than the light emission efficiency of the first sub-pixel 41, it is equivalent to decrease the light emission efficiency of the first sub-pixel 41 or increase the light emission efficiency of the second sub-pixel 42, and when the light emission efficiency of the second sub-pixel 42 is increased, the increase of the light emission efficiency of the second sub-pixel 42 is such that the light emission efficiency of the second sub-pixel 42 is lower than the light emission efficiency of the third sub-pixel 43. When the light emitting efficiency of the first sub-pixel 41 is reduced, the corresponding operating voltage of the first sub-pixel 41 will increase; when the light emitting efficiency of the second sub-pixel 42 is increased, the corresponding operating voltage of the second sub-pixel 42 is decreased. Therefore, the working voltage difference between the second sub-pixel 42 and the first sub-pixel 41 is reduced, the difference is smaller than the working voltage difference between the third sub-pixel 43 and the first sub-pixel 41, and even if a leakage current flows from the anode of the light emitting unit 30 corresponding to the second sub-pixel 42 to the anode of the light emitting unit 30 corresponding to the first sub-pixel 41 in the second color display picture, the leakage current does not cause the first sub-pixel 41 to emit light, so that the phenomenon that the first sub-pixel 41 is stolen and lighted in the second color display picture is effectively avoided, and the display effect of the display panel 100 is also improved.
In an alternative embodiment of the present invention, the first color light is red, the second color light is green, and the third color light is blue. Specifically, when the first color light is red, the second color light is green, and the third color light is blue, the design of the present application is favorable for improving the phenomenon that the green picture or the blue picture is impure due to the fact that the first sub-pixel 41 is stolen under the green display picture or the blue display picture, thereby being favorable for improving the display effect of the display panel 100 under the green display picture or the blue display picture.
In an alternative embodiment of the present invention, fig. 8 is a schematic diagram illustrating an arrangement of pixel units 40 in a display panel 100 according to an embodiment of the present application, where a plurality of pixel units 40 form a plurality of pixel columns, and sub-pixels in the pixel columns are arranged along a first direction; one of the pixel units 40 includes a first sub-pixel 41, a second sub-pixel 42, and a third sub-pixel 43; at least some of the sub-pixels in the same pixel unit 40 are located in the same pixel column, and at least some of the sub-pixels are located in a pixel column adjacent to the pixel column.
Specifically, referring to the figure, one pixel unit 40 includes 3 sub-pixels, the second sub-pixel 42 and the third sub-pixel 43 in the same pixel unit 40 are located in the same pixel column, and the first sub-pixel 41 is located in a pixel column adjacent to the pixel column. In the arrangement structure, when the first sub-pixel 41 is a red sub-pixel, the second sub-pixel 42 is a green sub-pixel, and the third sub-pixel 43 is a blue sub-pixel, the pixel aperture area of the blue sub-pixel is the largest, the pixel aperture area of the green sub-pixel is the next to the pixel aperture area of the green sub-pixel, and the pixel aperture area of the red sub-pixel is the smallest. In addition, since the lifetime of the light emitting material forming the blue sub-pixel is relatively short, when the pixel opening area of the blue sub-pixel is increased, the usage amount of the light emitting material of the blue sub-pixel is correspondingly increased, which is beneficial to increasing the lifetime corresponding to the blue sub-pixel, and is further beneficial to increasing the lifetime of the display panel 100. In addition, when the sub-pixel with the largest influence on the white luminance lifetime synthesized by the blue sub-pixel, the green sub-pixel and the red sub-pixel is the green sub-pixel, the pixel opening area of the green sub-pixel is set to be larger than that of the red sub-pixel, and the improvement of the overall lifetime of the display panel 100 is also facilitated.
In an alternative embodiment of the present invention, with continued reference to fig. 8, the first sub-pixel 41, the second sub-pixel 42 and the third sub-pixel 43 in the same pixel unit 40 are arranged in a triangle.
Specifically, when the pixel opening areas of the three sub-pixels are different, the same pixel unit 40 is formed by arranging the first sub-pixel 41, the second sub-pixel 42 and the third sub-pixel 43 in a triangular shape, the space of the display panel 100 can be reasonably utilized, and more pixel units 40 are placed in the same area of the display area 11, so that the pixel density of the display panel 100 can be improved, and the display effect of the display panel 100 can be improved.
Based on the same inventive concept, the present application further provides a display device 200, and fig. 9 is a schematic diagram of the display device 200 provided in the embodiment of the present application, where the display device 200 includes the display panel 100 provided in any of the above embodiments of the present application. It should be noted that, for the embodiments of the display device 200 provided in the embodiments of the present application, reference may be made to the embodiments of the display panel 100, and repeated descriptions are omitted. The display device 200 provided by the present application may be: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In summary, the display panel and the display device provided by the invention at least achieve the following beneficial effects:
in the display panel and the display device provided by the invention, each pixel unit on the display panel respectively comprises a first sub-pixel for emitting first color light, a second sub-pixel for emitting second color light and a third sub-pixel for emitting third color light, under the same gray scale, the working voltage of the first sub-pixel is less than or equal to the working voltage of the second sub-pixel, the working voltage of the second sub-pixel is less than the working voltage of the third sub-pixel, according to the acceptance degree of the actual brightness stealing degree of the current product, when the working voltage difference between the third sub-pixel with the maximum working voltage and the first sub-pixel with the minimum working voltage is set within 0.3V, the problem that the first sub-pixel of the display panel is brightened under the pure color display pictures of the second color and the third color is favorably improved, and the problem that the white picture deviates from the first color under the condition of low-gray level white picture display is favorably improved, therefore, the display effect of the display panel and the display device can be improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A display panel is characterized by comprising a display area and a non-display area, wherein the display area comprises a plurality of pixel units, and each pixel unit comprises a first sub-pixel emitting first color light, a second sub-pixel emitting second color light and a third sub-pixel emitting third color light;
in each pixel unit, under the same gray scale, the working voltage of the first sub-pixel is V1The working voltage of the second sub-pixel is V2The working voltage of the third sub-pixel is V3Wherein V is1≤V2≤V3And, 0 is not more than V3-V1＜0.3V；
The first sub-pixel comprises a first light-emitting unit, and a second pole of the first light-emitting unit is connected with the first sub-node; the third sub-pixel comprises a third light-emitting unit, and a second pole of the third light-emitting unit is connected with a third sub-node;
when the first light emitting unit emits light, the relationship between the voltage of the first sub-node and the actual aperture ratio of the first sub-pixel is as follows: vR0＝VR3+(VR1-VR3)*(A3-A2)/(A3-A1) Wherein V isR0Is the actual working voltage value of the first sub-node; a. the1Is a first reference aperture ratio of the first sub-pixel, A2Is the actual aperture ratio of the first sub-pixel, A3Is a second reference aperture ratio of the first sub-pixel, the first reference aperture ratio and the second reference aperture ratio of the first sub-pixel are known numbers, and A1＜A2＜A3；VR1When the first reference aperture ratio of the first sub-pixel is A1A first reference voltage value corresponding to the first sub-node; vR3When the second reference aperture ratio of the first sub-pixel is A3And then, a second reference voltage value corresponding to the first sub-node, wherein the first reference voltage value and the second reference voltage value corresponding to the first sub-node are known numbers.
2. The display panel of claim 1, wherein the first sub-pixel comprises a first sub-pixel opening, the second sub-pixel comprises a second sub-pixel opening, and the third sub-pixel comprises a third sub-pixel opening; wherein, in the same pixel unit, the pixel unitThe area of the first sub-pixel opening is S1The area of the third sub-pixel opening is S3，S1＜S3。
3. The display panel of claim 2, wherein S is3/S1≥1.5:1。
4. The display panel of claim 2, wherein the second sub-pixel opening has an area S2Wherein S is1＜S2＜S3。
5. The display panel according to claim 1, wherein the first electrode of the first light emitting cell is electrically connected to a first fixed voltage terminal; the second sub-pixel comprises a second light-emitting unit, a first electrode of the second light-emitting unit is electrically connected with the first fixed voltage end, and a second electrode of the second light-emitting unit is connected with a second sub-node; the first electrode of the third light emitting unit is electrically connected with the first fixed voltage terminal.
6. The display panel according to claim 1, wherein when the third light emitting unit emits light, a relationship between a voltage of the third sub-node and an actual aperture ratio of a third sub-pixel is: vB0＝VB1+(VB1-VB3)*(B3-B2)/(B3-B1) Wherein V isB0Is the actual operating voltage value of the third sub-node, B1Is the first reference aperture ratio of the third sub-pixel, B2Is the actual aperture ratio of the third sub-pixel, B3Is a second reference aperture ratio of a third sub-pixel, the first reference aperture ratio and the second reference aperture ratio of the third sub-pixel are known numbers, and B1＜B2＜B3；VB1When the first reference aperture ratio of the third sub-pixel is B1A first reference voltage value corresponding to the third sub-node; vB3When the second reference aperture ratio of the third sub-pixel is B3When it is in use, theAnd the first reference voltage value and the second reference voltage value corresponding to the third sub-node are known numbers.
7. The display panel of claim 1, wherein within the same pixel cell: when the first sub-pixel emits light, the luminous efficiency of the first sub-pixel is W1(ii) a When the third sub-pixel emits light, the luminous efficiency of the third sub-pixel is W3(ii) a Wherein, W1＜W3。
8. The display panel according to claim 7, wherein when the second sub-pixel emits light, the second sub-pixel has a light emission efficiency of W2Wherein W is1＜W2＜W3。
9. The display panel according to claim 1, wherein a plurality of the pixel units form a plurality of pixel columns, and sub-pixels in the pixel columns are arranged in a first direction; one of the pixel units includes a first sub-pixel, a second sub-pixel and a third sub-pixel;
at least part of sub-pixels in the same pixel unit are located in the same pixel column, and at least part of sub-pixels are located in a pixel column adjacent to the pixel column.
10. The display panel according to claim 9, wherein the first sub-pixel, the second sub-pixel and the third sub-pixel in the same pixel unit are arranged in a triangle.
11. The display panel according to claim 1, wherein the first color light is red, the second color light is green, and the third color light is blue.
12. A display device comprising the display panel according to any one of claims 1 to 11.
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