CN112038493A - Display panel and display device - Google Patents

Abstract

The invention provides a display panel and a display device, wherein the display panel comprises a plane area and bending areas arranged at two sides of the plane area, the display panel comprises a substrate, an anode, a hole injection layer, a hole transport layer, a luminescent layer, a cathode and an encapsulation layer which are arranged in a stacking way, in the bending areas, the thickness of the hole transport layer at one side far away from the plane area is larger than that of the hole transport layer at one side close to the plane area, and the thickness of the encapsulation layer at one side far away from the plane area is smaller than that of the encapsulation layer at one side close to the plane area; the display device comprises a driving chip, wherein the driving chip stores a compensation voltage conversion table for providing compensation voltage for the pixels in the bending area according to the pixel angle in the bending area. The invention alleviates the problem of overlarge color cast of the bending area by changing the thicknesses of the hole transport layer and the packaging layer of the bending area, compensates the voltage of pixels of the bending area and further improves the color cast problem.

Description

Display panel and display device

Technical Field

The invention relates to the field of display, in particular to a display panel and a display device.

Background

When the current display panel displays a picture at the bent part of the edge, the picture display effect is not ideal. The main reason is that when the screen is bent, under a normal viewing angle, human eyes perceive that the luminance of pixels in a bent area is gradually reduced along with the increase of the bending angle, certain viewing angle deviation exists between a panel of the bent area and the human eyes, under a certain viewing angle, the coordinates of a picture observed by the human eyes are deviated to a certain degree, and the two aspects jointly cause distortion of the displayed picture.

Therefore, the conventional display panel has a problem that the color shift of the display panel is too large in the bend region.

Disclosure of Invention

The embodiment of the invention provides a display panel and a display device, which are used for relieving the problem of overlarge color deviation of the display panel in a bending area.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the invention provides a display panel, which comprises a plane area and bending areas arranged at two sides of the plane area, wherein the display panel comprises a substrate, an anode, a hole injection layer, a hole transport layer, a light-emitting layer, a cathode and an encapsulation layer which are arranged in a stacked mode;

in the bending area, the thickness of the hole transport layer on the side far away from the plane area is larger than that of the hole transport layer on the side close to the plane area, and the thickness of the encapsulation layer on the side far away from the plane area is smaller than that of the encapsulation layer on the side close to the plane area.

In some embodiments, the thickness of the hole transport layer gradually increases in a direction away from the planar region.

In some embodiments, the thickness of the encapsulation layer gradually decreases in a direction away from the planar area.

The present invention also provides a display device, including:

the display panel comprises a plane area and bending areas arranged on two sides of the plane area;

the packaging cover plate is attached to the display panel;

the compensation voltage conversion table obtains voltage compensation information according to the pixel angle in the bending area;

and the driving chip is used for driving the pixels in the plane area to emit target brightness, receiving the voltage compensation information and driving the pixels in the bending area to emit the target brightness.

In some embodiments, the bending region pixel angle is an included angle between a perpendicular line and a line connecting the bending region pixel and the center of the bending region.

In some embodiments, the step of obtaining the compensation voltage conversion table comprises:

dividing the bending area into a first angle, a second angle and a third angle;

acquiring a first compensation voltage of the first angle pixel when the target brightness is displayed;

acquiring a second compensation voltage of the second angle pixel when the target brightness is displayed;

acquiring a third compensation voltage of the third angle pixel when the target brightness is displayed;

finding a first corresponding relationship among the second angle, the third angle and the first angle;

calculating a second corresponding relation among the second compensation voltage, the third compensation voltage and the first compensation voltage;

and calculating compensation voltage information corresponding to any angle according to the first corresponding relation and the second corresponding relation, wherein the compensation voltage information is stored in the compensation voltage conversion table.

In some embodiments, the common electrode lines included in the display panel are the same within the first angle, the second angle, and the third angle.

In some embodiments, the step of obtaining the first compensation voltage of the first angle pixel when displaying the target brightness comprises:

acquiring driving voltages of each pixel in the planar area when the target brightness is displayed, and selecting the average value of the driving voltages as a target driving voltage;

acquiring a first driving voltage of the first angle pixel when the target brightness is displayed;

the difference value between the first driving voltage and the target driving voltage is the first compensation voltage

In some embodiments, the first corresponding relationship is an arc conversion formula, and the second angle and the third angle may be expressed by the first corresponding relationship and the first angle.

In some embodiments, the second corresponding relationship is a linear relationship, and the second compensation voltage and the third compensation voltage may be represented by the second corresponding relationship and the first compensation voltage.

The invention provides a display panel and a display device, wherein the display panel comprises a plane area and bending areas arranged at two sides of the plane area, the display panel comprises a substrate, an anode, a hole injection layer, a hole transport layer, a luminescent layer, a cathode and an encapsulation layer which are arranged in a stacked mode, in the bending areas, the thickness of the hole transport layer at one side far away from the plane area is larger than that of the hole transport layer at one side close to the plane area, the thickness of the encapsulation layer at one side far away from the plane area is smaller than that of the encapsulation layer at one side close to the plane area, the display device comprises a driving chip, and a compensation voltage conversion table is stored in the driving chip to compensate voltage for pixels in the bending areas according to pixel angles. The invention alleviates the problem of overlarge color deviation of the bending area by changing the thicknesses of the hole transport layer and the packaging layer of the bending area, compensates the voltage of pixels of the bending area and further improves the problem of overlarge color deviation of the bending area.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a display panel in the prior art.

Fig. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the invention.

Fig. 4 is a first flowchart of a driving method according to an embodiment of the present invention.

Fig. 5 is a schematic flowchart of a second driving method according to an embodiment of the present invention.

Fig. 6 is a schematic side view of a display panel according to an embodiment of the invention.

Fig. 7 is a third flowchart illustrating a driving method according to an embodiment of the invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

In the prior art, the waterfall screen mainly adopts a display panel with a uniform film layer, and as shown in fig. 1, the display panel comprises a plane area a1 and a bending area a2 located at two sides of the plane area. As shown in fig. 2, the display panel includes asubstrate 100, ananode 200, ahole injection layer 300, ahole transport layer 400, alight emitting layer 500, acathode 600, and anencapsulation layer 700, which are stacked, and all film layers of the display panel have the same thickness in a display region and a bending region. However, when the display panel displays a picture in the curved area, under a normal viewing angle, human eyes perceive that the luminance of pixels in the curved area is gradually reduced along with the increase of the bending angle, and a certain viewing angle deviation exists between the panel in the curved area and the human eyes, so that a certain deviation occurs when a color coordinate is observed under a certain viewing angle, and the two aspects jointly cause distortion of the displayed picture and cause a poor display effect.

As shown in fig. 3 to 7, in order to alleviate the problem of poor display effect of the conventional display panel in the bending area, the present invention provides a display panel and a display device.

As shown in fig. 1, the display panel includes a planar area a1 and a bending area a2 disposed at both sides of the planar area, and as shown in fig. 3, the display panel includes asubstrate 100, ananode 200, ahole injection layer 300, ahole transport layer 400, alight emitting layer 500, acathode 600, and anencapsulation layer 700, which are stacked; wherein, in the bending region, the thickness of thehole transport layer 400 at the side far away from the planar region A1 is greater than the thickness of thehole transport layer 400 at the side near the planar region A1, and the thickness of theencapsulation layer 700 at the side far away from the planar region A1 is less than the thickness of theencapsulation layer 700 at the side near the planar region A1.

In some embodiments, the thickness of thehole transport layer 400 gradually increases in a direction away from the planar region a1, the thickness of thehole transport layer 400 is between 40 nanometers and 60 nanometers in the planar region a1, and the thickness of thehole transport layer 400 is between 70 nanometers and 90 nanometers in the curved region a 2.

In some embodiments, the thickness of theencapsulation layer 700 gradually decreases in a direction away from the planar region a1, the thickness of theencapsulation layer 700 in the planar region a1 is 5 to 10 microns, and the thickness of theencapsulation layer 700 in the bend region a2 is 3 to 8 microns.

In some embodiments, theencapsulation layer 700 includes afirst encapsulation layer 710, asecond encapsulation layer 720 and athird encapsulation layer 730, thefirst encapsulation layer 710 and thethird encapsulation layer 730 are inorganic encapsulation layers, thesecond encapsulation layer 720 is an organic encapsulation layer, the inorganic encapsulation layer is one of silicon nitride, silicon oxide and aluminum oxide, and the organic encapsulation layer is one of hexamethyldisiloxane, polyacrylate, polycarbonate and polystyrene.

In some embodiments, thefirst encapsulation layer 710 is formed on the side of thecathode 600 far away from thelight emitting layer 500 by a chemical vapor deposition method, the thickness of thefirst encapsulation layer 710 is between 0.5 and 1 micrometer, thesecond encapsulation layer 720 is formed on the side of thefirst encapsulation layer 710 far away from thecathode 600 by inkjet printing, the thickness of thesecond encapsulation layer 720 is between 2 and 3 micrometers, thethird encapsulation layer 730 is formed on the side of thesecond encapsulation layer 720 far away from thefirst encapsulation layer 710 by a chemical vapor deposition method, and the thickness of thethird encapsulation layer 730 is between 0.5 and 1 micrometer.

In some embodiments, thefirst encapsulation layer 710 and thethird encapsulation layer 730 have a uniform thickness over the bending region a2, and the thickness of thesecond encapsulation layer 720 gradually decreases in a direction away from the planar region.

In some embodiments, thefirst encapsulation layer 710 is uniform in thickness over the bend region a2, and the thickness of thesecond encapsulation layer 720 and thethird encapsulation layer 730 gradually decreases in a direction away from the planar region.

According to the invention, the thickness of thetransmission layer 400 is increased in the direction of the bending area far away from the plane area, so that the color cast angle is effectively relieved, and meanwhile, the thickness of thepackaging layer 700 is reduced in the direction of the bending area far away from the plane area, so that the whole thickness of the display panel is uniform.

The present invention also provides a display device, including:

the display panel comprises a planar area and bending areas arranged on two sides of the planar area, and the display panel comprises a substrate, an anode, a hole injection layer, a hole transport layer, a light emitting layer, an anode and an encapsulation layer which are arranged in a stacked mode; in the bending area, the thickness of the hole transport layer on the side far away from the plane area is greater than that of the hole transport layer on the side close to the plane area, and the thickness of the encapsulation layer on the side far away from the plane area is less than that of the encapsulation layer on the side close to the plane area;

the packaging cover plate is attached to the surface of the display panel;

the memory chip is stored with a compensation voltage conversion table, and the compensation voltage conversion table obtains voltage compensation information of the pixels in the bending area according to the angles of the pixels in the bending area;

and the driving chip is used for driving the pixels in the plane area to emit target brightness, receiving the compensation voltage information and driving the pixels in the bending area to emit the target brightness.

As shown in fig. 4, the present invention also provides a driving method of a display device, the driving method including:

step S1: the storage chip acquires a target driving voltage of each pixel in a plane area when the display panel displays the target brightness.

Step S2: the storage chip stores a compensation voltage conversion table based on the target driving voltage, and the compensation voltage conversion table obtains voltage compensation information of the pixels in the bending area according to the angles of the pixels in the bending area.

Step S3: the driving chip is used for providing the target driving voltage for the display panel and providing the compensation voltage for the pixels in the bending area.

In step S1, the storage chip obtains the driving voltage of each pixel in the planar area when displaying the target display luminance, and takes the average value as the target driving voltage.

In step S2, as shown in fig. 5, the step of the storage chip storing a compensation voltage conversion table based on the target voltage, the step of the storage chip determining the compensation voltage of the bent pixel according to the compensation voltage conversion table and sending to the driving chip includes:

step S201: determining the bend region pixel angle.

Step S202: and calling the driving voltage conversion relation table.

Step S203: and sending an instruction to the driving chip according to the corresponding relation between the compensation voltage in the driving voltage conversion relation table and the corresponding angle of the bent pixel.

In step S201, as shown in fig. 6, fig. 6 is a schematic cross-sectional view of the display panel, where the display panel includes a planar area a1 and a first curved area a2 and a second curved area A3 located at two sides of the planar area, and taking the first curved area a2 as an example, a center of a curvature of the curved area is determined, and a perpendicular line at a connection between the first curved area a2 and the planar area a2 is taken as a reference, and then the curvature of the curved area is equally divided into a first angle θ 1, a second angle θ 2, and a third angle θ 3, where common electrode lines corresponding to pixels in the first angle θ 1, the second angle θ 2, and the third angle θ 3 are the same. For any angle corresponding to a pixel in the bending area, the angle can be represented by the first angle θ 1, for example, when the angle is represented by the first angle θ 1 of one third, the area corresponding to the pixel is located at one ninth of the bending area and near the plane area a 1.

In step S202, as shown in fig. 7, the step of acquiring the compensation voltage conversion table includes:

step S301: and dividing the bending area into a first angle, a second angle and a third angle.

Step S302: and acquiring a first compensation voltage of the first angle pixel when the target brightness is displayed.

Step S303: and acquiring a second compensation voltage of the second angle pixel when the target brightness is displayed.

Step S304: and acquiring a third compensation voltage of the third angle pixel when the target brightness is displayed.

Step S305: and calculating a first corresponding relation among the second angle, the third angle and the first angle.

Step S306: and calculating a second corresponding relation among the second compensation voltage, the third compensation voltage and the first compensation voltage.

Step S307: and calculating compensation voltage information corresponding to any angle according to the first corresponding relation and the second corresponding relation, wherein the compensation voltage information is stored in the compensation voltage conversion table.

In step S301, as shown in fig. 6, fig. 6 is a schematic cross-sectional view of the display panel, which includes a planar area a1 and a first bending area a2 and a second bending area A3 located at two sides of the planar area, and taking the example of being lower than the bending area a2, the center of the arc of the bending area is determined, and then the bending area is divided into the first area, the second area and the third area. A boundary line of the first region in a direction away from the planar region a1 with reference to a perpendicular line at the junction of the first bending region a2 and the planar region a1 is represented as a slope of a first angle θ 1; a second angle θ 2 is represented by a slope of a boundary line of the second region in a direction away from the planar region a1, with reference to a vertical line at a junction of the first curved region a2 and the planar region a1, with reference to a horizontal line; a boundary line of the third region in a direction away from the planar region a1 with reference to a perpendicular line at the junction of the first bending region a2 and the planar region a1 is represented as a slope of a third angle θ 3. Converting the first angle theta 1, the second angle theta 2 and the third angle theta 3 into a first radian, a second radian and a third radian; fitting the first radian, the second radian and the third radian to obtain the first corresponding relation. In the first relationship, any angle may be represented by the first angle θ 1.

In step S302, the storage chip obtains the driving voltage of each pixel in the planar area when displaying the target display luminance, and takes the average value as the target driving voltage data. And selecting a first angle pixel to obtain a first driving voltage of the first angle pixel displayed at a target, and subtracting the target driving voltage data from the first driving voltage to obtain a first compensation voltage a 1.

In step S303, a second angle pixel is selected to obtain a second driving voltage for the second angle pixel to display at the target, and the first driving voltage and the target driving voltage data are subtracted from each other to obtain a second compensation voltage a 2.

In step S304, a third angle pixel is selected to obtain a third driving voltage for the third angle pixel to display at the target, and the first driving voltage and the target driving voltage data are subtracted from each other to obtain a first compensation voltage a 3.

In step S305, a first correspondence relationship is established by substituting the first angle θ 1, the second angle θ 2, and the third angle θ 3 into θ according to the arc conversion formula a ═ 2 ═ R (θ/360), so as to obtain a first arc a1, a second arc a2, and a third arc A3, where the second arc a2 and the third arc A3 can be expressed according to the first arc a 1.

In step S306, since the thickness of the hole transport layer on the side away from the planar region gradually increases, the first angle θ 1 is equal to the average thickness h1 in the first region, the second angle θ 2 is equal to the average thickness h2 in the second region, and the third angle θ 3 is equal to the average thickness h3 in the third region, i.e., h3-h 2-h 2-h 1. Since the compensation voltage has a direct relationship with the thickness of the hole transport layer, fitting is performed by substituting the first compensation voltage a1, the second compensation voltage a2, and the third compensation voltage a3 into a linear function, so as to obtain a second relationship of a3-a 2-a 2-a1, in which the second compensation voltage a2 and the third compensation voltage a3 can both be represented by the first compensation voltage a 1.

In step S307, for an arbitrary angle n, the angle n may be represented by a first angle a1 and a first corresponding relationship; according to the first relationship, the compensation voltage corresponding to the angle can be obtained according to the second relationship and the first compensation voltage a 1. And a compensation voltage conversion table can be established for the compensation voltage corresponding to any angle.

The invention provides a display panel and a display device, wherein the display panel comprises a plane area and bending areas arranged at two sides of the plane area, and the display panel comprises a substrate, an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an anode and an encapsulation layer which are arranged in a stacked mode; in the bending area, the thickness of the hole transport layer at the side far away from the plane area is larger than that of the hole transport layer at the side close to the plane area, and the thickness of the packaging layer at the side far away from the plane area is smaller than that of the packaging layer at the side close to the plane area. The invention solves the problem of overlarge color deviation of the bending area by changing the thicknesses of the hole transport layer and the packaging layer of the bending area, and also provides a driving method for further improving the problem of overlarge color deviation of the bending area.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The display panel and the display device provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in the present document by applying specific examples, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The display panel is characterized by comprising a plane area and bending areas arranged at two sides of the plane area, wherein the display panel comprises a substrate, an anode, a hole injection layer, a hole transport layer, a light-emitting layer, a cathode and an encapsulation layer which are arranged in a stacked mode;

in the bending area, the thickness of the hole transport layer on the side far away from the plane area is larger than that of the hole transport layer on the side close to the plane area, and the thickness of the encapsulation layer on the side far away from the plane area is smaller than that of the encapsulation layer on the side close to the plane area.

2. The display panel of claim 1, wherein the hole transport layer gradually increases in thickness in a direction away from the planar region.

3. The display panel of claim 1, wherein the encapsulation layer has a thickness that gradually decreases in a direction away from the planar area.

4. A display device, characterized in that the display device comprises:

the display panel according to any one of claims 1 to 3, comprising a planar area and curved areas disposed on both sides of the planar area;

the packaging cover plate is attached to the display panel;

the memory chip is stored with a compensation voltage conversion table, and the compensation voltage conversion table obtains voltage compensation information of the pixels in the bending area according to the angles of the pixels in the bending area;

and the driving chip is used for driving the pixels in the plane area to emit target brightness, receiving the voltage compensation information and driving the pixels in the bending area to emit the target brightness.

5. The display device according to claim 4, wherein the bending region pixel angle is an angle between a line connecting the bending region pixel and the center of the bending region and a vertical line.

6. The display device according to claim 4, wherein the step of obtaining the compensation voltage conversion table includes:

dividing the bending area into a first angle, a second angle and a third angle;

acquiring a first compensation voltage of the first angle pixel when the target brightness is displayed;

acquiring a second compensation voltage of the second angle pixel when the target brightness is displayed;

acquiring a third compensation voltage of the third angle pixel when the target brightness is displayed;

finding a first corresponding relationship among the second angle, the third angle and the first angle;

calculating a second corresponding relation among the second compensation voltage, the third compensation voltage and the first compensation voltage;

and calculating compensation voltage information corresponding to any angle according to the first corresponding relation and the second corresponding relation, wherein the compensation voltage information is stored in the compensation voltage conversion table.

7. The display device according to claim 6, wherein the display panel includes the same common electrode lines in the first angle, the second angle, and the third angle.

8. The display device according to claim 6, wherein the step of obtaining the first compensation voltage of the first angle pixel when displaying the target luminance comprises:

acquiring driving voltages of each pixel in the planar area when the target brightness is displayed, and selecting the average value of the driving voltages as a target driving voltage;

acquiring a first driving voltage of the first angle pixel when the target brightness is displayed;

the difference value between the first driving voltage and the target driving voltage is the first compensation voltage.

9. The display device according to claim 6, wherein the first correspondence is an arc conversion formula, and the second angle and the third angle are expressed by the first correspondence and the first angle.

10. The display device according to claim 6, wherein the second correspondence relationship is a linear relationship, and the second compensation voltage and the third compensation voltage can be represented by the second correspondence relationship and the first compensation voltage.

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