Flexible display panel for display device and display device

A flexible display panel for a display device and a display device are provided. The flexible display panel includes: a first display portion and a second display portion connected with the first display portion. A color temperature of a first white image displayed by the first display portion in a flat state is different from a color temperature of a second white image displayed by the second display portion in the flat state.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a flexible display panel for a display device, and a display device.

BACKGROUND

In recent years, with the progress of display technologies, organic light emitting diode (OLED) display is one of the hotspots in the research field of flat panel displays. More and more active matrix organic light emitting diode (AMOLED) display panels have entered the market. Compared with traditional thin film transistor liquid crystal display (TFT LCD), AMOLED has a faster respond speed, a higher contrast and a wider viewing angle. With the development of display technologies, more and more electronic devices begin to use curvable and flexible OLED display screens that are light and thin and have good impact resistance.

Traditional display technologies all adopt a single display mode. During viewing, when the orientation of the viewer changes, the display picture cannot be changed according to the orientation change of the viewer. For example, when the viewing direction of the user changes from the front to an oblique direction, the brightness, contrast and color gamut of the liquid crystal display device will change, resulting in a degenerated visual effect. In particular, for some high-end display or special display occasions, such as medical treatment, graphic design and other fields, the requirement for controlling the viewing angle color shift (color difference of different viewing angles) is high, and the viewing angle color shift of a common display panel needs to be improved.

SUMMARY

One embodiment of the present disclosure provides a flexible display panel for a display device, wherein the display device includes a flat display portion and a bent display portion, the flexible display panel includes a first display portion and a second display portion connected with the first display portion, the first display portion is configured as the flat display portion, the second display portion is configured as the bent display portion, the first display portion in a flat state and the second display portion in a flat state are configured to display a first white image and a second white image respectively at the same time, and a color temperature of the second white image is different from a color temperature of the first white image.

In one example, the flexible display panel is an electroluminescent display panel, and each pixel unit in the first display portion and the second display portion includes at least a first primary color sub-pixel and a second primary color sub-pixel, wherein in a case where the first display portion in the flat state displays the first white image and the second display portion in the flat state displays the second white image, an intensity ratio of light emitted by the second primary color sub-pixel in the first display portion to light emitted by the first primary color sub-pixel in the first display portion is different from an intensity ratio of light emitted by the second primary color sub-pixel in the second display portion to light emitted by the first primary color sub-pixel in the second display portion.

In one example, an effective light emitting area of the second primary color sub-pixel in the second display portion is larger than an effective light emitting area of the second primary color sub-pixel in the first display portion.

In one example, a dye doping concentration of a light emitting layer of the second primary color sub-pixel in the first display portion is smaller than a dye doping concentration of a light emitting layer of the second primary color sub-pixel in the second display portion.

In one example, a difference between the color temperature of the first white image and the color temperature of the second white image is greater than or equal to 2000 K.

In one example, the color temperature of the first white image is less than the color temperature of the second white image.

In one example, the first display portion and the second display portion are directly connected.

In one example, a part of the first display portion is configured to display a reference white image in a bending state, the reference white image having a color shift of a first color with respect to the first white image, the second white image has a color shift of a second color with respect to the first white image, and the first color and the second color are complementary colors to each other.

In one example, each pixel unit in the first display portion and the second display portion further includes a third primary color sub-pixel, a ratio of effective light emitting areas of the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel in each pixel unit of the first display portion is X:Y:Z, a ratio of effective light emitting areas of the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel in each pixel unit of at least a first sub-region of the second display portion is X:(m1×Y):(n1×Z), where m1 is greater than or equal to 1, and n1 is greater than or equal to 1.1.

In one example, a ratio of effective light emitting areas of the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel in each pixel unit of at least a second sub-region of the second display portion is X:(m2×Y):(n2×Z), where m2>m1, and n2>n1; wherein the second sub-region is further away from the first display portion than the first sub-region.

In one example, in a case where the first display portion in the flat state displays the first white image and the second display portion in the flat state displays the second white image, color temperatures of the first white image, a first sub-white image displayed in the first sub-region and a second sub-white image displayed in the second sub-region sequentially increase or sequentially decrease.

In one example, the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel are a red sub-pixel, a green sub-pixel and a blue sub-pixel, respectively.

Another embodiment of the present disclosure provides a display device including: a support member and any one flexible display panel described above, wherein the support member has a flat support surface and a bent support surface adjacent to each other, the first display portion of the flexible display panel is bonded to the flat support surface as the flat display portion, and the second display portion of the flexible display panel is bonded to the bent support surface as the bent display portion.

In one example, the flexible display panel is an electroluminescent display panel, and each pixel unit in the flat display portion and the bent display portion includes at least a first primary color sub-pixel and a second primary color sub-pixel, in a case where the flat display portion displays the first white image and the bent display portion displays the second white image, an intensity ratio of light emitted by the second primary color sub-pixel in the flat display portion to light emitted by the first primary color sub-pixel in the flat display portion is different from an intensity ratio of light emitted by the second primary color sub-pixel in the bent display portion to light emitted by the first primary color sub-pixel in the bent display portion.

In one example, the bent display portion is configured to display a third white image, and a difference between the color temperature of the first white image and a color temperature of the third white image is less than or equal to 500 K.

In one example, each pixel unit in the flat display portion and the bent display portion further includes a third primary color sub-pixel, a ratio of effective light emitting areas of the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel in each pixel unit of the flat display portion is X:Y:Z, a ratio of effective light emitting areas of the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel in each pixel unit of at least a first sub-portion of the bent display portion is X:(m1×Y):(n1×Z), where m1≥1, and n1≥1.1.

In one example, a ratio of effective light emitting areas of the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel in each pixel unit of at least a second sub-portion of the bent display portion is X:(m2×Y):(n2×Z), where m2≥m1, and n2≥n1; wherein the second sub-portion is further away from the flat display portion than the first sub-portion.

In one example, the first sub-portion is configured to display a fourth sub-white image, the second sub-portion is configured to display a fifth sub-white image, and a difference between a color temperature of the fourth sub-white image and a color temperature of the fifth sub-white image is less than or equal to 200 K.

In one example, the first primary color sub-pixel, the second primary color sub-pixel and the third primary color sub-pixel are a red sub-pixel, a green sub-pixel and a blue sub-pixel, respectively.

In one example, a surface of the flat display portion away from the support member is located in a first plane, in a cross-section of the display device, the bent support surface has a curved shape, a tangent line of a surface of the first sub-portion away from the support member forms a first included angle a1 with the first plane, a tangent line of a surface of the second sub-portion away from the support member forms a second included angle a2 with the first plane, the first included angle a1 and the second included angle a2 are both acute angles, and the second included angle a2 is larger than the first included angle a1.

Because the color temperature of the first white image displayed by the first display portion in the flat state is different from the color temperature of the second white image displayed by the second display portion in the flat state, color shift caused by bending of the second display portion can be offset, so that the first display portion in the flat state and the second display portion in the bending state have more color consistency, such as having the same color temperature, when displaying a white image simultaneously.

DETAILED DESCRIPTION

An OLED display screen mainly realizes image display by driving electroluminescent elements to emit light through current. The inventors have found that due to factors such as the structural characteristics of the electroluminescent elements and the manufacturing process of the display screen, etc., color shift may occur on the display screen in a large field of view, particularly, in the bent area after the display screen is bent, the color shift phenomenon is more significant, thereby affecting the display effect of the display screen.

The present disclosure provides a flexible display panel and a display device including the flexible display panel, which can improve the front viewing color shift problem of an edge region of the flexible display panel in a bending state, thereby improving the display effect of the display panel.

The embodiments of the present disclosure provide a flexible display panel100for a display device. The flexible display panel100is, for example, an organic electroluminescent display panel. The display device includes a flat display portion and a bent display portion.FIG. 1shows a schematic plan view of a flexible display panel in a flat state provided by an embodiment of the present disclosure. Referring toFIG. 1, the flexible display panel100includes: a main display portion110(an example of a first display portion) and two edge display portions120(an example of a second display portion) connected to the main display portion110. The first display portion is configured as the flat display portion and the at least one second display portion is configured as the bent display portion. The two edge display portions120are respectively located on opposite sides of the main display portion110. In the plan view shown inFIG. 1, each edge display portion120is directly connected to the main display portion100, so there is no non-display portion between each edge display portion120and the main display portion100. The main display portion110and the two edge display portions120together constitute a continuous effective display portion AA of the flexible display panel100. The boundary of the effective display portion AA is adjacent to a non-display portion F. The embodiments of the present disclosure does not limit the number of edge display portions120included in the flexible display panel100, as long as the edge display portions120are located at the periphery of the main display portion. In one example, the flexible display panel100may include only one edge display portion120; in another example, the flexible display panel100may include three or more edge display portions120. In another example, there may be a non-display portion between at least one edge display portion120and the main display portion100. In this case, the effective display portion AA of the flexible display panel100composed of the main display portion110and the two edge display portions120can be discontinuous.

The main display portion110includes a plurality of main pixel units P1arranged in an array, and each edge display portion120includes a plurality of edge pixel units P2arranged in an array.

The main display portion110is configured to display a first white image in a flat state. The edge display portion120is configured to display a second white image in a flat state.

Color temperature is a measurement unit that indicates color component contained in a light beam. Theoretically speaking, color temperature refers to the color of absolute black body after heated from absolute zero (−273° C.). The black body gradually changes from black to red, to yellow, to white, and finally emits blue light after being heated. When heated to a certain temperature, the light emitted by the black body contains a specific spectral component, therefore the temperature is referred to as the color temperature of the light with the specific spectral component, and the measurement unit is “K” (Kelvin). If the light emitted by a certain light source has the same spectral component as the light emitted by a blackbody at a certain temperature, that is, has a certain K color temperature.

When the main display portion110in a flat state is driven to display the first white image at a first time instant, each main pixel unit P1within the main display portion110is driven to display a white pixel point. The white pixel point displayed by each main pixel unit P1has a corresponding color temperature. The arithmetic average value of the color temperatures of the white pixel points respectively displayed by all the main pixel units P1in the main display portion110is the color temperature of the first white image displayed by the main display portion. For example, the color temperature of the first white image is 6500 K.

When the edge display portion120in a flat state is driven to display the second white image at the first time instant, each edge pixel unit P2within the edge display portion120is driven to display a white pixel point. The white pixel point displayed by each edge pixel unit P2has a corresponding color temperature. The arithmetic average value of the color temperatures of the white pixel points respectively displayed by all the edge pixel units P2in the edge display portion120is the color temperature of the second white image displayed by the edge display portion120.

Because the color temperature of the first white image displayed by the main display portion110in the flat state is different from the color temperature of the second white image displayed by the edge display portion120in the flat state at the same time instant, color shift caused by bending of the edge display portion120can be offset, so that the main display portion110in the flat state and the edge display portion120in the bending state have more color consistency, such as having the same color temperature, when displaying a white image at the same time.

The color temperature of the first white image is different from the color temperature of the second white image. For example, the difference between the color temperature of the first white image and the color temperature of the second white image is greater than or equal to 2000 K. For example, the difference between the color temperature of the first white image and the color temperature of the second white image is greater than or equal to 3500 K. For example, the color temperature of the first white image is less than the color temperature of the second white image. The color temperature difference in this range can more effectively adjust the color shift caused by the bending of the flexible display panel.

For example, a part of the main display portion110is configured to display a reference white image in a bending state, and the reference white image has a color shift of a first color with respect to the first white image. For example, the color shift in the present disclosure refers to a front viewing color shift that can be observed when the central line of the observer's sight is perpendicular to the part of the main display portion110in the flat state. For example, the first color is, for example, red. That is, the reference image is reddish with respect to the first white image. When the edge display portion120in the flat state is driven to display a second white image, the second white image has a color shift of a second color with respect to the first white image displayed by the main display portion110in the flat state. For example, the first color and the second color are, for example, complementary colors to each other. Here, complementary colors are a pair of colors that cancel each other out (lose hue) by producing white when combined or mixed. For example, the color temperature of the second white image is 9000 K. The second color is, for example, cyan, that is, the second white image is cyanish with respect to the first white image.

Here, the flexible display panel100is configured to be combined to a support member for display. Referring toFIG. 3, the support member200includes a flat support surface210and two bent support surfaces220. The main display portion110of the flexible display panel100is configured to be conformally combined on the flat support surface to be in the flat state for display; the edge display portion120of the flexible display panel100is configured to be conformally combined to the bent support surface to be in a bending state for display. For example, the edge display portion120is configured to display a third white image in a bending state at the first time instant.

When the edge display portion120in the bending state is driven to display the third white image, each edge pixel unit P2within the edge display portion120is driven to display a white pixel point. The white pixel point displayed by each edge pixel unit P2has a corresponding color temperature. The arithmetic average value of the color temperatures of the white pixel points respectively displayed by all the edge pixel units P2in the edge display portion120in the bending state is the color temperature of the third white image displayed by the edge display portion120. For example, the color temperature of the third white image is 6500 K.

With continued reference toFIG. 1, the edge display portion120includes a first sub-region121, a second sub-region122, and a third sub-region123sequentially arranged in a direction away from the main display portion110.

The edge pixel units P2include a plurality of first edge pixel units P21arranged in an array in the first sub-region121, a plurality of second edge pixel units P22arranged in an array in the second sub-region122, and a plurality of third edge pixel units P23arranged in an array in the third sub-region123. InFIG. 1, the first sub-region121is schematically shown by a column of first edge pixel units P21; the second sub-region122is schematically shown by a column of second edge pixel units P22; the third sub-region123is schematically shown by a column of third edge pixel units P23.

In one example, the first sub-region121is configured to display a first sub-white image having a first color temperature in the flat state. For example, the first color temperature is 8500 K. The second sub-region122is configured to display a second sub-white image having a second color temperature in the flat state. For example, the second color temperature is 9500 K. The third sub-region123is configured to display a third sub-white image having a third color temperature in the flat state. For example, the third color temperature is 10500K. That is, the first color temperature, the second color temperature and the third color temperature sequentially increase. In this way, compensation for gradual color shift caused after the first sub-region121, the second sub-region122, and the third sub-region123of the edge display portion120are attached to the bent support surface can be realized.

In the present embodiment, each main pixel unit P1includes a red sub-pixel P1R, a green sub-pixel P1G, and a blue sub-pixel P1B. Each edge pixel unit P2includes a red sub-pixel P2R, a green sub-pixel P2G, and a blue sub-pixel P2B. For example, each first edge pixel unit P21includes a red sub-pixel P2R1, a green sub-pixel P2G1, and a blue sub-pixel P2B1; each second edge pixel unit P22includes a red sub-pixel P2R2, a green sub-pixel P2G2, and a blue sub-pixel P2B2; each third edge pixel unit P23includes a red sub-pixel P2R3, a green sub-pixel P2G3, and a blue sub-pixel P2B3.

In the present embodiment, a ratio of effective light emitting areas of the red sub-pixel P1R, the green sub-pixel P1G, and the blue sub-pixel P1Bin each main pixel unit P1is X:Y:Z. A ratio of effective light emitting areas of the red sub-pixel P2R1, the green sub-pixel P2G1, and the blue sub-pixel P2B1in each first edge pixel unit P21is X:(m1×Y):(n1×Z), where m1 is greater than or equal to 1, and n1 is greater than or equal to 1.1. In one example, m1 is equal to 1 and n1 is equal to 1.5. A blue dye doping concentration of the light emitting layer of the blue sub-pixel P2B1in the first edge pixel unit P21can be greater than or equal to a blue dye doping concentration of the light emitting layer of the blue sub-pixel P1Bin the main pixel unit P1. Therefore, when the main pixel unit P1and the first edge pixel unit P21are driven to emit white light, a ratio of blue light to red light in the white light emitted by the first edge pixel unit P21can be greater than a ratio of blue light to red light in the white light emitted by the main pixel unit P1. In addition, a green dye doping concentration of the light emitting layer of the green sub-pixel P2G1in the first edge pixel unit P21is greater than a green dye doping concentration of the light emitting layer of the green sub-pixel P1Gin the main pixel unit P1. Thus, when the main pixel unit P1and the first edge pixel unit P21are driven to emit white light, a ratio of green light to red light in the white light emitted by the first edge pixel unit P21can be greater than a ratio of green light to red light in the white light emitted by the main pixel unit P1. Therefore, the white light emitted from the first edge pixel unit P21with the above configuration can have a larger proportion of cyan light component than the white light emitted from the main pixel unit P1with the above configuration. In this way, it can be realized that the first color temperature of the first sub-white image displayed by the first sub-region121in the flat state is greater than the color temperature of the first white image displayed by the main display portion110in the flat state.

In the above embodiment, by increasing the effective light emitting area of the blue sub-pixel P2B1in the first edge pixel unit P21, on the one hand, the remaining space of the pixel region can be effectively utilized to realize adjustment of color temperature, and on the other hand, the problem that the service life of the blue sub-pixel is rapidly reduced can be avoided.

In the above embodiment, by keeping the effective light emitting area of the green sub-pixel P2G1in the first edge pixel unit P21the same as that of the green sub-pixel P1Gin the main pixel unit P1, on the one hand, space can be left for increasing the effective light emitting area of the blue sub-pixel, and on the other hand, the manufacturing process can be simplified.

In the present embodiment, the effective light emitting area of each sub-pixel can be controlled by changing the opening in the pixel defining layer. The bottom of the opening in the pixel defining layer exposes a pixel electrode (e.g., an anode of an organic light emitting diode). The area where the organic light emitting material filled in the opening directly contacts the pixel electrode through the opening can be considered as the effective light emitting area of the corresponding sub-pixel. InFIG. 1, a rectangular frame in each sub-pixel schematically represents the effective light emitting area of the sub-pixel.

With continued reference toFIG. 1, further, a ratio of the effective light emitting areas of the red sub-pixel P2R2, the green sub-pixel P2G2, and the blue sub-pixel P2B2in each second edge pixel unit P22is X:(m2×Y):(n2×Z), where m2=m1, and n2>n1. A blue dye doping concentration of the light emitting layer of the blue sub-pixel P2B2in the second edge pixel unit P22can be greater than or equal to the blue dye doping concentration of the light emitting layer of the blue sub-pixel P2B1in the first edge pixel unit P21. A green dye doping concentration of the light emitting layer of the green sub-pixel P2G2in the second edge pixel unit P22is greater than the green dye doping concentration of the light emitting layer of the green sub-pixel P2G1in the first edge pixel unit P21.

With continued reference toFIG. 1, further, a ratio of the effective light emitting areas of the red sub-pixel P2R3, the green sub-pixel P2G3and the blue sub-pixel P2B3in each third edge pixel unit P23is X:(m3×Y):(n3×Z), where m3=m2, and n3>n2. A doping concentration of the light emitting layer of the blue sub-pixel P2B3in the third edge pixel unit P23can be greater than or equal to the doping concentration of the light emitting layer of the blue sub-pixel P2B2in the second edge pixel unit P22. A doping concentration of the light emitting layer of the green sub-pixel P2G3in the third edge pixel unit P23is greater than the doping concentration of the light emitting layer of the green sub-pixel P2G2in the second edge pixel unit P22.

In the above embodiment, the reference white image has a red color shift with respect to the first white image, and the second white image has a cyan color shift with respect to the first white image. However, the embodiments of the present disclosure are not limited thereto. In another embodiment, for example, the reference white image has a cyan color shift with respect to the first white image, and the second white image has a red color shift with respect to the first white image, correspondingly. In this case, the first sub-region121, the second sub-region122, and the third sub-region123are configured to display sub-white images with average color temperatures decreasing in sequence in the flat state.

The embodiments of the present disclosure do not limit the structure of the edge pixel unit P2, as long as the control of color temperature of the white light emitted by the edge pixel unit P2can be realized. In another example m3>m2>m1>1, n3>n2>n1>1. In this case, the doping concentrations of light emitting layers of sub-pixels of the same color in pixel units of different sub-regions can be the same or different.

In the above embodiment, the pixel units in the first sub-region121, the second sub-region122, and the third sub-region123are configured to have different structures such that the color temperature of the first sub-white image displayed by the first sub-region121in the flat state, the second color temperature of the second sub-white image displayed by the second sub-region122in the flat state, and the third color temperature of the third sub-white image displayed by the third sub-region123in the flat state, are sequentially increased, but the embodiments of the present disclosure are not limited thereto. In another example, pixel units in the first sub-region121, the second sub-region122, and the third sub-region123are configured to have the same structure such that the color temperature of the first sub-white image displayed by the first sub-region121in the flat state, the second color temperature of the second sub-white image displayed by the second sub-region122in the flat state, and the third color temperature of the third sub-white image displayed by the third sub-region123in the flat state, are equal.

For example, in the above embodiment, the light emitting layer of each red sub-pixel is configured to emit red light, the light emitting layer of each green sub-pixel is configured to emit green light, and the light emitting layer of each blue sub-pixel is configured to emit blue light. The light emitting layers of sub-pixels of various colors are, for example, organic light emitting material layers.

In the above embodiment, each pixel unit in the main display portion and the edge display portion of the flexible display panel includes three sub-pixels of different colors from each other, but the embodiments of the present disclosure are not limited thereto. In another embodiment, each pixel unit in the main display portion and the edge display portion of the flexible display panel may include only two sub-pixels of different colors from each other. In further another embodiment, each pixel unit in the main display portion and the edge display portion of the flexible display panel may include only four sub-pixels of different colors from each other. For example, in a case where the main display portion in the flat state displays the first white image and the edge display portion in the flat state displays the second white image, an intensity ratio of the first color light emitted by the first color sub-pixel to the second color light emitted by the second color sub-pixel in the main display portion is different from an intensity ratio of the first color light emitted by the first color sub-pixel to the second color light emitted by the second color sub-pixel in the edge display portion. Thus, the color temperature of the first white image displayed by the main display portion and the color temperature of the second white image displayed by the edge display portion can be caused to be different.

FIG. 2is a schematic top view of a display device provided by an embodiment of the disclosure. An example of the display device is a portable telephone.FIG. 3shows a schematic cross-sectional view of the display device provided by the embodiment of the present disclosure along line LL′ inFIG. 2.FIG. 4is an enlarged view of a portion in the dashed frame ofFIG. 3.

Referring toFIG. 3, the display device10provided by the embodiment of the present disclosure includes: any one flexible display panel100described above and a support member200.

The support member200has a flat support surface210and at least one bent support surface220adjacent to the flat support surface210. InFIG. 3, the support member200has two bent support surfaces220located on opposite sides of the flat support surface210. In addition, the support member200also has, for example, a back surface240opposite to the flat support surface210and two flat side surfaces230that are opposite to each other and connect the two bent support surfaces220to the back surface240, respectively. In another example, the two bent support surfaces220of the support member200are directly connected to the back surface240, so that the support member200may not include two flat side surfaces230opposite to each other.

The main display portion110of the flexible display panel100is bonded to the flat support surface210as a flat display portion FP of the display device10; the two edge display portions120of the flexible display panel100are respectively bonded to the bent support surfaces220as bent display portions BP of the display device10. Here, the flat display portion FP and the bent display portions BP of the display device10are not coplanar.

The main display portion110in the flat state is configured to display a first white image in the flat state at a first time instant. That is, the flat display portion FP of the display device10is configured to display the first white image at the first time instant. When the main display portion110in the flat state is driven to display the first white image, each main pixel unit P1within the main display portion110is driven to display a white pixel point. The white pixel point displayed by each main pixel unit P1has a corresponding color temperature. The arithmetic average value of the color temperatures of the white pixel points respectively displayed by all the main pixel units P1in the main display portion110is the color temperature of the first white image displayed by the main display portion. For example, the color temperature of the first white image is 6500 K.

The edge display portion120is configured to display a third white image in the bending state at the first time instant. That is, the bent display portion BP of the display device10is configured to display the third white image at the first time instant. When the edge display portion120in the bending state is driven to display the third white image, each edge pixel unit P2within the edge display portion120is driven to display a white pixel point. The white pixel point displayed by each edge pixel unit P2has a corresponding color temperature. The arithmetic average value of the color temperatures of the white pixel points respectively displayed by all the edge pixel units P2in the edge display portion120in the being state is the color temperature of the third white image displayed by the edge display portion120. The flat display portion FP and the bent display portion BP of the display device10are configured to respectively display the first white image and the third white image at the same time instant. For example, the difference between the color temperature of the first white image and the color temperature of the third white image is less than or equal to 500 K. For example, the color temperature of the first white image is 6500 K, and the color temperature of the third white image is 6700 K. For another example, the color temperature of the first white image is 6500 K, and the color temperature of the third white image is also 6500 K.

With continued reference toFIG. 3, the bent support surface220of the support member200has a cross-sectional shape of a curve. Here, the curve is the shape of a part of a circle or an ellipse. In another example, the bent support surface220of the support member200can also have a cross-sectional shape of a straight line; in further another example, the curved support surface220of the support member200can also have a cross-sectional shape of a combination of a straight line and a curve. The embodiments of the present disclosure do not limit the shape of the curved support surface.

The sectional view ofFIG. 4shows that the first sub-region121, the second sub-region122and the third sub-region123of the edge display portion120of the flexible display panel100are bonded to the bent support surface220to be in a bending state and act as a first sub-portion BP1, a second sub-portion BP2and a third sub-portion BP3of the bent display portion BP of the display device10, respectively.

InFIG. 1, the first sub-region121, the second sub-region122, and the third sub-region123are adjacent to each other. InFIG. 4, the first sub-region121, the second sub-region122and the third sub-region123in the bending state are respectively taken as the first sub-portion BP1, the second sub-portion BP2and the third sub-portion BP3of the display device. The first sub-portion BP1, the second sub-portion BP2and the third sub-portion BP3are adjacent to each other. However, the embodiments of the present disclosure are not limited thereto. In another example, there may be other display portions between the first sub-region121and the second sub-region122; and there may be other display portions between the second sub-region122and the third sub-region123. A bent display portion may also exist between the first sub-portion BPI and the second sub-portion BP2, and a bent display portion may also exist between the second sub-portion BP2and the third sub-portion BP3.

In one example, the first sub-region121is configured to display a first sub-white image having a first color temperature in the flat state. For example, the first color temperature is 8500 K. The first sub-region121is configured to display a fourth sub-white image having a fourth color temperature in the bending state, that is, the first sub-portion BPI of the bent display portion BP of the display device10is configured to display a fourth sub-white image having a fourth color temperature. For example, the fourth color temperature is 6500 K. Here, a driving signal for driving the first sub-region121to display the first sub-white image having the first color temperature in the flat state is the same as a driving signal for driving the first sub-region121to display the fourth sub-white image having the fourth color temperature in the bending state. That is, a small red color shift of the first sub-region121due to bending and a small cyan color shift of the first sub-region121carried by itself can cancel each other out to present a color characteristic more consistent with that of the main display portion110, such as substantially the same color temperature.

The second sub-region122is configured to display a second sub-white image having a second color temperature in the flat state. For example, the second color temperature is 9500 K. The second sub-region122is configured to display a fifth sub-white image having a fifth color temperature in the bending state, that is, the second sub-portion BP2of the bent display portion BP of the display device10is configured to display a fifth sub-white image having a fifth color temperature. For example, the fifth color temperature is 6500 K. Here, a driving signal for driving the second sub-region122to display the second sub-white image having the second color temperature in the flat state is the same as a driving signal for driving the second sub-region122to display the fifth sub-white image having the fifth color temperature in the bending state. That is, a medium red color shift of the second sub-region122due to bending and a medium cyan color shift of the second sub-region122carried by itself can cancel each other out to present a color characteristic more consistent with that of the main display portion110, such as substantially the same color temperature.

The third sub-region123is configured to display a third sub-white image having a third color temperature in the flat state. For example, the third color temperature is 10500 K. The third sub-region123is configured to display a sixth sub-white image having a sixth color temperature in a bending state, that is, the third sub-portion BP3of the bent display portion BP of the display device10is configured to display a sixth sub-white image having a sixth color temperature. For example, the sixth color temperature is 6500 K. Here, a driving signal for driving the third sub-region123to display the third sub-white image having the third color temperature in the flat state is the same as a driving signal for driving the third sub-region123to display the sixth sub-white image having the sixth color temperature in the bending state. That is, a large red color shift of the third sub-region123due to bending and a large cyan color shift of the third sub-region123carried by itself can cancel each other out to present a color characteristic more consistent with that of the main display portion110, such as substantially the same color temperature.

In this way, gradual color shift caused after the first sub-region121, the second sub-region122, and the third sub-region123of the edge display portion120are attached to the bent support surface is correspondingly compensated. Therefore, a more uniform white balance of all display portions of the display device can be realized.

In another example, a maximum difference between the fourth color temperature, the fifth color temperature, and the sixth color temperature is less than or equal to 200 K.

In the present embodiment, the bending of the flexible display panel causes a red color shift, so the first color temperature, the second color temperature, and the third color temperature are sequentially increased. It can be understood that, if the bending of the flexible display panel causes a blue color shift, the first color temperature, the second color temperature and the third color temperature can be sequentially decreased.

In the embodiment shown inFIGS. 3 and 4, the edge display portion120of the flexible display panel100is completely located on the bent support surface220. In another example, the edge display portion120of the flexible display panel100can be further located on the side surface230of the support member200.

The main display portion110of the flexible display panel100includes a plurality of main pixel units P1arranged in an array, and each edge display portion120includes a plurality of edge pixel units P2arranged in an array. The description of the plurality of main pixel units P1and the plurality of edge pixel units P2in the present embodiment can be referred to the corresponding description of the flexible display panel100shown inFIG. 1.

Each main pixel unit P1includes a red sub-pixel P1R, a green sub-pixel P1G, and a blue sub-pixel P1B. Each edge pixel unit P2includes a red sub-pixel P2R, a green sub-pixel P2G, and a blue sub-pixel P2B. For example, each first edge pixel unit P21in the first sub-region121includes a red sub-pixel P2R1, a green sub-pixel P2G1, and a blue sub-pixel P2B1; each second edge pixel unit P22in the second sub-region122includes a red sub-pixel P2R2, a green sub-pixel P2G2, and a blue sub-pixel P2B2; each third edge pixel unit P23in the third sub-region123includes a red sub-pixel P2R3, a green sub-pixel P2G3, and a blue sub-pixel P2B3.

In the present embodiment, a ratio of effective light emitting areas of the red sub-pixel P1R, the green sub-pixel P1G, and the blue sub-pixel P1Bin each main pixel unit P1is X:Y:Z. A ratio of effective light emitting areas of the red sub-pixel P2R1, the green sub-pixel P2G1, and the blue sub-pixel P2B1in each first edge pixel unit P21is X:(m1×Y):(n1×Z), where m1 is greater than or equal to 1, and n1 is greater than or equal to 1.1. In one example, m1 is equal to 1 and n1 is equal to 1.5. A doping concentration of the light emitting layer of the blue sub-pixel P2B1in the first edge pixel unit P21can be greater than or equal to a doping concentration of the light emitting layer of the blue sub-pixel P1Bin the main pixel unit P1. Therefore, when the main pixel unit P1and the first edge pixel unit P21are driven to emit white light, a ratio of blue light to red light in the white light emitted by the first edge pixel unit P21can be greater than a ratio of blue light to red light in the white light emitted by the main pixel unit P1. In addition, a doping concentration of the light emitting layer of the green sub-pixel P2G1in the first edge pixel unit P21is greater than a doping concentration of the light emitting layer of the green sub-pixel P1Gin the main pixel unit P1. Thus, when the main pixel unit P1and the first edge pixel unit P21are driven to emit white light, a ratio of green light to red light in the white light emitted by the first edge pixel unit P21can be greater than a ratio of green light to red light in the white light emitted by the main pixel unit P1.

With continued reference toFIG. 1, further, a ratio of the effective light emitting areas of the red sub-pixel P2R2, the green sub-pixel P2G2, and the blue sub-pixel P2B2in each second edge pixel unit P22is X:(m2×Y):(n2×Z), where m2=m1, and n2>n1. A doping concentration of the light emitting layer of the blue sub-pixel P2B2in the second edge pixel unit P22can be greater than or equal to the doping concentration of the light emitting layer of the blue sub-pixel P2B1in the first edge pixel unit P21. A doping concentration of the light emitting layer of the green sub-pixel P2G2in the second edge pixel unit P22is greater than the doping concentration of the light emitting layer of the green sub-pixel P2G1in the first edge pixel unit P21.

With continued reference toFIG. 1, further, a ratio of the effective light emitting areas of the red sub-pixel P2R3, the green sub-pixel P2G3and the blue sub-pixel P2B3in each third edge pixel unit P23is X:(m3×Y):(n3×Z), where m3=m2, and n3>n2. A doping concentration of the light emitting layer of the blue sub-pixel P2B3in the third edge pixel unit P23can be greater than or equal to the doping concentration of the light emitting layer of the blue sub-pixel P2B2in the second edge pixel unit P22. A doping concentration of the light emitting layer of the green sub-pixel P2G3in the third edge pixel unit P23is greater than the doping concentration of the light emitting layer of the green sub-pixel P2G2in the second edge pixel unit P22.

Referring toFIG. 4, a surface of the flat display portion FP of the display device10away from the support member200is located in a first plane P1. In the cross-sectional view shown inFIG. 4, a tangent line of a surface of the first sub-portion BPI of the bent display portion BP away from the surface of the support member200, forms a first included angle a1 with the first plane P1; a tangent line of a surface of the second sub-portion BP2of the bent display portion BP away from the surface of the support member200forms a second included angle a2 with the first plane P1; a tangent line of a surface of the third sub-portion BP3of the bent display portion BP away from the surface of the support member200forms a third included angle a3 with the first plane P1. The first included angle a1, the second included angle a2 and the third included angle a3 are all acute angles, and a1<a2<a3. That is, the degree of bending of the first sub-part BP1, the second sub-part BP2, and the third sub-part BP3of the bent display portion BP gradually increases, and the red color shift due to bending also gradually increases. For example, the color shift in the embodiments of the present disclosure refers to a front viewing color shift that can be observed when the central line of the observer's sight is perpendicular to the part of the main display portion110in the flat state.

In the embodiments of the present disclosure, the first sub-region121, the second sub-region122, and the third sub-region123are configured to display sub-white images with gradually increasing color temperatures in a flat state. That is, in the flat state, the cyan color shift of the sub-white images displayed by the first sub-region121, the second sub-region122, and the third sub-region123sequentially increases. In this way, when the first sub-region121, the second sub-region122, and the third sub-region123are in the bending state shown inFIGS. 3 and 4, a small red color shift caused by the bending of the first sub-region121having the small bending angle a1 is compensated by the small cyan color shift caused by the pixel structure of the first sub-region121itself; a medium red color shift caused by the bending of the second sub-region122having the medium bending angle a2 is compensated by the medium cyan color shift caused by the pixel structure of the second sub-region122itself; a large red color shift caused by the bending of the third sub-region123having the large bending angle a3 is compensated by the large cyan color shift caused by the pixel structure of the third sub-region123itself. Therefore, a front viewing white balance effect can be realized, thus improving the color shift problem in the bending region during front viewing.

It should be noted that, in the above-described embodiment, the edge display portion120of the flexible display panel100includes three sub-regions121,122, and123with gradually varying color temperatures, but the flexible display panel provided by the embodiment of the present disclosure is not limited thereto. In another embodiment, the edge display portion120of the flexible display panel can include four or more sub-regions with gradually varying color temperatures in a direction away from the main display portion110in the flat state; in further another embodiment, the edge display portion120of the flexible display panel can include only two sub-regions with gradually varying color temperatures in the direction away from the main display portion110in the flat state; in still another embodiment, the edge display portion120of the flexible display panel includes only one sub-region in the flat state, that is, the entire edge display portion120of the flexible display panel has the same color temperature.

In the above embodiment, the bent display portion BP of the display device10includes three sub-portions corresponding to the flexible display panel100, but the display device provided by the embodiment of the present disclosure is not limited thereto. In another embodiment, the bent display portion BP of the display device10can include four or more sub-portions corresponding to the flexible display panel100; in further another embodiment, the bent display portion BP of the display device10can include only two sub-portions corresponding to the flexible display panel100; in still another embodiment, the bent display portion BP of the display device10can include only one sub-region corresponding to the flexible display panel100, that is, the bent display portion BP itself.

It can be understood that, the display device provided by the embodiment of the present disclosure is not limited to a portable phone, but can include various display devices, such as a television, a notebook computer, an electronic advertisement board, a wearable device, and so on.

The following statements should be noted:

(2) For the purpose of clarity only, in accompanying drawings for illustrating the embodiment(s) of the present disclosure, the thickness and size of a layer or a structure may be enlarged. It should be understood that, in a case where a component or element such as a layer, film, area, substrate or the like, is referred to be “on” or “under” another component or element, it may be directly on or under the another component or element, or a component or element is interposed therebetween.

(3) In case of no conflict, features in one embodiment or in different embodiments of the present disclosure can be combined.

Although the present disclosure has been described in detail with general descriptions and specific embodiments above, it is obvious to those skilled in the art that some modifications or improvements can be made to the embodiments of the present disclosure. Therefore, all such modifications or improvements made without departing from the spirit of this disclosure are within the scope of protection claimed in the present disclosure.