CN111312775B - Pixel unit, display panel, brightness compensation method of display panel and display device - Google Patents

Pixel unit, display panel, brightness compensation method of display panel and display device Download PDF

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CN111312775B
CN111312775B CN202010120284.3A CN202010120284A CN111312775B CN 111312775 B CN111312775 B CN 111312775B CN 202010120284 A CN202010120284 A CN 202010120284A CN 111312775 B CN111312775 B CN 111312775B
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pixel
sub
pixels
color
type
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CN111312775A (en
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李田田
刘孟宇
周小康
刘俊哲
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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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

The invention relates to a pixel unit, comprising at least three pixels with different light-emitting colors; the pixel of at least one light-emitting color comprises a first type sub-pixel and a second type sub-pixel which have different light-emitting materials; the full width at half maximum of the light emitted by the first type of sub-pixel of a same color pixel is larger than the full width at half maximum of the light emitted by the second type of sub-pixel. In the pixel unit, the brightness attenuation speed of the light emitted by the first type of sub-pixel along with the increase of the visual angle is different from the attenuation speed of the light emitted by the second type of sub-pixel along with the increase of the visual angle, and the attenuation speed of each color of light can be adjusted by setting the number, the light emitting area and/or the arrangement mode of the first type of sub-pixel and the second type of sub-pixel, so that the brightness attenuation speed of each color of light along with the increase of the visual angle is more matched, the visual angle color cast is improved, and the power consumption and the color cast of a screen body are considered to achieve balance. A display panel, a brightness compensation method thereof and a display device are also provided.

Description

Pixel unit, display panel, brightness compensation method of display panel and display device
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel unit, a display panel, a brightness compensation method thereof, and a display device.
Background
Organic Light-Emitting display (OLED) panels have characteristics of self-luminescence, lightness, thinness, high contrast, fast response, and wide viewing angle, and are widely used in various display devices. In the related art, an organic light emitting display panel includes a plurality of pixel units, each including a plurality of sub-pixels emitting different colors, and displays various color images by proportionally superimposing lights of different colors to obtain other colors. However, the different color pixels may be attenuated to different degrees with the use of the display panel, resulting in color shift of the display.
Disclosure of Invention
In view of the above, it is necessary to provide a pixel unit, a control method thereof, a display panel and a display device, which can solve the problem of color shift of a display panel.
According to one aspect of the present application, there is provided a pixel unit, comprising pixels of at least three different emission colors;
the pixel of at least one light-emitting color comprises a first type sub-pixel and a second type sub-pixel which have different light-emitting materials;
the full width at half maximum of the light emitted by the first type of sub-pixel of a same color pixel is larger than the full width at half maximum of the light emitted by the second type of sub-pixel.
In the pixel unit, the brightness attenuation speed of the light emitted by the first type sub-pixel along with the increase of the visual angle is different from the attenuation speed of the light emitted by the second type sub-pixel along with the increase of the visual angle, and the attenuation speed of each color light can be adjusted by setting the number, the light emitting area and/or the arrangement mode of the first type sub-pixel and the second type sub-pixel, so that the brightness attenuation speed of each color light along with the increase of the visual angle is more matched, the visual angle color cast is improved, and the power consumption and the color cast of the screen body are considered to achieve balance.
In an embodiment, the same color pixel comprises a plurality of first type sub-pixels emitting light with at least two different sizes of full widths at half maximum.
In one embodiment, the first type of sub-pixel of a same color pixel comprises a first sub-pixel and a second sub-pixel having different sizes of full widths at half maximum;
the ratio of the difference between the full widths at half maximum of the first and second type sub-pixels of a same color pixel to the difference between the full widths at half maximum of the second and second type sub-pixels is 1/2.
In one embodiment, the total light emitting area of the first type sub-pixels of the same color pixel is larger than that of the second type sub-pixels.
In one embodiment, the first-type sub-pixels of the same-color pixels are disposed on at least one side of the second-type sub-pixels.
In an embodiment, the first-type sub-pixels of the same-color pixels are plural, and the plural first-type sub-pixels of the same-color pixels are arranged around the second-type sub-pixels.
In one embodiment, the pixel unit includes a first color pixel, a second color pixel and a third color pixel with different light emitting colors;
the third color pixel emits light having a wavelength less than the wavelengths of the light emitted by the first and second color pixels.
In an embodiment, the third color pixel comprises a plurality of sub-pixels of the first type;
the plurality of first type sub-pixels of the third color pixel are disposed around the first type sub-pixels of the first color pixel, the second color pixel, and the second type sub-pixels of the third color pixel.
In an embodiment, the first type sub-pixels of the third color pixel comprise a plurality of first sub-pixels and a plurality of second sub-pixels, the first sub-pixels and the second sub-pixels having different sizes of full widths at half maximum;
the central connecting lines of the plurality of first sub-pixels and the plurality of second sub-pixels form a virtual polygon; the first sub-pixels and the second sub-pixels are alternately arranged along the vertexes of the virtual multi-deformation.
In an embodiment, the third color pixel comprises a plurality of sub-pixels of the first type and a plurality of sub-pixels of the second type;
the first-type sub-pixels and the plurality of second-type sub-pixels of a part of the third-color pixels are arranged around the first-type sub-pixels, the second-color pixels and the rest of the first-type sub-pixels of the third-color pixels.
According to another aspect of the present application, there is provided a display panel including a plurality of pixel units as in the above embodiments.
According to still another aspect of the present application, there is provided a display device including the display panel as in the above embodiments.
According to still another aspect of the present application, there is provided a luminance compensation method of a display panel, the display panel including pixels of at least three different light emission colors; the pixel of at least one light-emitting color comprises a first type sub-pixel and a second type sub-pixel which have different light-emitting materials; the full width at half maximum of the light emitted by the first type of sub-pixel of a same color pixel is greater than the full width at half maximum of the light emitted by the second type of sub-pixel;
the method comprises the following steps:
obtaining brightness attenuation parameters of light with different colors;
the first type of sub-pixels and/or the second type of sub-pixels of at least one color pixel are compensated according to a brightness attenuation parameter of light of different colors.
In one embodiment, the pixel unit includes a first color pixel, a second color pixel and a third color pixel with different light emission colors; the third color pixel emits light having a wavelength less than the wavelengths of the light emitted by the first and second color pixels;
the method comprises the following steps:
and when the difference between the brightness attenuation parameter of the light of the third color and the brightness attenuation parameter of the light of the first color and/or the brightness attenuation parameter of the light of the second color is larger than a preset value, compensating the first type sub-pixel and/or the second type sub-pixel of the third color.
Drawings
FIG. 1 is a schematic plan view of a display panel according to an embodiment of the present application;
fig. 2 is a schematic layout diagram of a pixel unit according to an embodiment of the present application;
FIG. 3 is a schematic layout diagram of a pixel unit according to another embodiment of the present application;
FIG. 4 is a graph of a spectrum of a display panel according to an embodiment of the present application;
FIG. 5 is a graph of a spectrum of a second type of sub-pixel in an embodiment of the present application;
FIG. 6 is a schematic layout diagram of a pixel unit according to another embodiment of the present application;
fig. 7 is a flowchart illustrating a method for compensating brightness of a display panel according to an embodiment of the present disclosure.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As described in the background art, a display panel generally includes a plurality of pixel units arranged in a matrix, each pixel unit includes sub-pixels emitting different colors, and light emitted from the sub-pixels of different colors is mixed with each other to form various colors of an image display. However, the conventional display panel has color shift when viewed at a large viewing angle, and the inventors have studied that the main cause of such a problem is that the luminance decay rate of light emitted from sub-pixels of different emission colors is different as the viewing angle increases. For example, each pixel unit may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. For example, blue light emitted by a blue sub-pixel is visible light with the highest energy close to an ultraviolet region, the wavelength is generally between 400 and 500 nanometers, and the wavelength is shorter but has higher energy than red light and green light, so that the luminescent material of the blue sub-pixel is more prone to decay in the luminescent process.
Therefore, the present application provides a display panel, which is designed specifically for a pixel unit, and can reduce the luminance attenuation difference between sub-pixels with different colors, so as to better improve the problem of color shift and make the display more uniform.
Before explaining the present application in detail, some contents are explained first to facilitate better understanding of technical solutions and effects of the present application.
Full width at half maximum: the full width at half maximum is the width of the peak height at half the peak height of the spectrum, i.e. the distance between the intersection of the straight line with the two sides of the peak and the straight line parallel to the bottom of the peak is drawn through the middle point of the peak height. In other words, it is the width of the wavelength of the point 1/2 where the main peak wavelength has the maximum intensity.
Viewing angle: the viewing angle indicates an angle at which the user views the image, and if the user views the image from the front of the display panel, the viewing angle is 0 ° and the viewing angle gradually increases from the front to the side. Specifically, the viewing angle gradually increases from the front to the lower side, the upper side, the left side, and the right side.
FIG. 1 is a schematic plan view of a display panel in an embodiment of the present application; fig. 2 is a schematic layout diagram of a pixel unit in an embodiment of the present application; fig. 3 shows a schematic layout of a pixel unit in another embodiment of the present application.
Referring to the drawings, a display panel 100 according to an embodiment of the present application includes a display region 10 and a non-display region 20, and the display region 10 displays an image by a pixel unit formed by a plurality of sub-pixels. In particular to some embodiments, the display area 10 may be rectangular and the non-display area 20 is arranged around the display area 10, of course, the shape and arrangement of the display area 10 and the non-display area 20 include, but are not limited to, the above examples, for example, when the display panel 100 is used for a wearable device worn on a user, the display area 10 may have a circular shape like a watch; when the display substrate is used for displaying on a vehicle, the display area 10 and the non-display area 20 may take a circular shape, a polygonal shape, or other shapes, for example.
The display region 10 is provided with a plurality of pixel units repeatedly arranged, the pixel units including at least three sub-pixels of different light emission colors, the sub-pixels being characterized as a minimum unit for emitting light, and for example, the pixel units may include first color pixels R, second color pixels G, and third color pixels emitting light of different colors. The first color, the second color, and the third color may be one of red, green, and blue, respectively, and the first color pixel R, the second color pixel G, and the third color pixel may constitute one pixel exhibiting white light. Of course, in other embodiments, the first color, the second color and the third color may be other colors than red, green and blue, and are not limited herein. It should be noted that the first color pixel R, the second color pixel G, and the third color pixel refer to a single sub-pixel or a set of multiple sub-pixels that can emit light of the first color, the second color, and the third color, for example, each of the first color pixel R, the second color pixel G, and the third color pixel may include one or more sub-pixels that emit the same color light.
The display panel 100 provided by the embodiment of the application can be an organic light-emitting display panel 100, the sub-pixels at least comprise an anode and a cathode, and a light-emitting layer located between the anode and the cathode, and the driving circuit applies a voltage between the anode and the cathode to excite carrier migration to act on the light-emitting layer, so that light is emitted. Specifically, the light-emitting layer at least comprises a hole transport layer, an organic material layer and an electron transport layer, the anode is used for providing holes for the hole transport layer or an electrode for transporting the holes, and the cathode is used for providing electrons for the organic material layer or transporting the electrons. In particular embodiments, the anode may be formed using a Transparent Conductive Oxide (TCO) material such as indium tin oxide, indium zinc oxide, etc., and the cathode may be formed of a metal material or a TCO material such as indium tin oxide, indium zinc oxide, etc. Here, the cathode may be shared by a plurality of sub-pixels, and thus, the cathode may also be referred to as a common electrode.
FIG. 4 is a graph showing the spectral characteristics of a display panel in one embodiment of the present application; fig. 5 shows a graph of the spectral characteristics of a second type of sub-pixel of a third color pixel in an embodiment of the present application.
The inventors of the present application continued to research and find that, by optimizing the full width at half maximum of the main peak wavelengths of different color lights, the degree of white light color shift of the display panel 100 based on the viewing angle can be reduced. Specifically, in the embodiments of the present application, the pixels of at least one emission color include first-type sub-pixels and second-type sub-pixels having different emission materials; the full width at half maximum of the light emitted by the first type of sub-pixel of the same color pixel is larger than the full width at half maximum of the light emitted by the second type of sub-pixel. For example, referring to fig. 2 and 3, the third color pixel includes a first type sub-pixel B1 and a second type sub-pixel B2 having different light emitting materials, and the full width at half maximum of light emitted from the first type sub-pixel B1 of the third color pixel is greater than the full width at half maximum of light emitted from the second type sub-pixel B2. It is understood that organic light emitting materials emitting light of the same color have different spectral curves of emitted light due to different materials or material purities, and in general, a narrower full width at half maximum in a spectral graph indicates higher light emission purity and brightness, but a faster decay rate. For example, as shown in fig. 4, taking blue light as an example, the full width at half maximum of the spectral curve 14 of blue light emitted by a blue light-emitting material with lower emission purity is wider and has a secondary peak, and then the sub-pixel corresponding to the spectral curve 14 is the first type sub-pixel B1. As shown in fig. 4 and 5, the spectral curve 11 of the blue light emitted from the blue light-emitting material with higher emission purity has a narrower full width at half maximum, and no secondary peak, i.e. no noise exists in the emitted light, and the corresponding sub-pixel is the second-type sub-pixel B2. It can be seen that the second-type sub-pixel B2 of the same color pixel has higher luminous efficiency and is more energy-saving than the first-type sub-pixel B1, but the luminance decays faster due to its narrow intrinsic spectrum. In this way, in the pixel unit, the luminance attenuation speed of the light emitted by the first type sub-pixel B1 of the same color pixel along with the increase of the viewing angle has a difference with the luminance attenuation speed of the light emitted by the second type sub-pixel B2 along with the increase of the viewing angle, and the attenuation speed of each color light can be adjusted by setting the number, the light emitting area, the arrangement mode and the like of the first type sub-pixel B1 and the second type sub-pixel B2 of the same color pixel, so that the luminance attenuation speeds of the color lights along with the increase of the viewing angle are more matched, the viewing angle color cast is improved, and the screen power consumption and the color cast are balanced. Referring to fig. 4, in some embodiments, a third color pixel includes first and second type sub-pixels having different light emitting materials, emits light having a wavelength less than that of the first and second color pixels R and G. Specifically, the first color may be red, the second color may be green, and the third color may be blue, as shown in the graph of the spectrum of fig. 4, where the horizontal axis is wavelength in nanometers and the vertical axis is light intensity, the full width at half maximum of the main peak wavelength of red light emitted from the first color pixel R may be between 600 nm and 650nm, the full width at half maximum of the main peak wavelength of green light emitted from the second color pixel G may be between 520 nm and 560nm, and the full width at half maximum of the main peak wavelength of blue light emitted from the third color pixel may be between 430 nm and 480 nm. Because the blue light wavelength is shorter than the red light wavelength and the green light wavelength, the organic light-emitting material emitting blue light is more prone to decay, and the light emitted from the pixel unit is more prone to red, which causes white light color cast. And, the light emitted from the light emitting layer of each sub-pixel is amplified and constructively interfered by repeating reflection and re-reflection between the anode and the cathode, the brightness of the light is increased, and the color shift is further amplified. Therefore, as the viewing angle increases, the white light color shift (red shift) becomes more obvious, which seriously affects the display quality of the display panel 100, and the first type sub-pixel and the second type sub-pixel of different luminescent materials are arranged through the blue pixel, which can broaden the light wavelength range emitted by the blue pixel, so that the luminance attenuation speed of the blue light can be more matched with the luminance attenuation speed of the red light and the green light, thereby improving the viewing angle color shift, and considering the screen power consumption and the color shift to achieve balance.
In some embodiments, the total area of light emitted by the first type sub-pixel B1 of the same color pixel is greater than the total area of light emitted by the second type sub-pixel B2. It should be understood that, when the viewing angle is increased, if the full width at half maximum of the main peak wavelength of a certain color light has a wider value, the attenuation degree thereof is reduced, the white color shift degree is smaller, and the total light emitting area of the first type sub-pixel of the same color pixel is set to be larger than that of the second type sub-pixel, so that the full width at half maximum of the main peak wavelength of the same color light in the pixel unit is ensured to have a higher value than that in other cases, and the efficacy of improving the color shift can be achieved. Further, as shown in fig. 4, the full width at half maximum of the main peak wavelength of red light is greater than the full width at half maximum of the main peak wavelength of green light, and the full width at half maximum of the main peak wavelength of green light is greater than the full width at half maximum of the main peak wavelength of blue light, and when the display panel 100 forms white light by color mixing of red light, green light, and blue light, the mixing may be performed in a ratio of approximately 30% of red light, 60% of green light, and 10% of blue light. In contrast, the full width at half maximum of the main peak wavelength of red light and the full width at half maximum of the main peak wavelength of green light have larger values than the full width at half maximum of the main peak wavelength of blue light, which means that the degree of white color shift is further smaller if the full width at half maximum of the main peak wavelength of blue light emission has a wider value as the viewing angle increases. Therefore, setting the total light-emitting area of the first-type sub-pixel B1 of the blue pixel to be larger than that of the second-type sub-pixel B2 ensures that the full width at half maximum of the main peak wavelength of the blue light emitted in the pixel unit has a higher value than other cases, thereby achieving better effect of improving color shift.
In some embodiments, the same color pixel includes a plurality of first type sub-pixels that emit light having full widths at half maximum of at least two different sizes. For example, the first type sub-pixel B1 of the same color pixel includes a first sub-pixel B11 and a second sub-pixel B12 having different sizes of full widths at half maximum. Referring to fig. 2 and 3, for example, the full width at half maximum of light emitted from the first-type sub-pixel B1 of the blue pixel may be 18-22nm, and the full width at half maximum of light emitted from the second-type sub-pixel B2 may be 16-18 nm. In one embodiment, the full width at half maximum of the first sub-pixel B11 of the blue pixel may be between 18 and 20nm, and the full width at half maximum of the second sub-pixel B12 may be between 20 and 22 nm. Therefore, full width at half maximum of the sub-pixels with the same color is gradually transited from low to high, so that the attenuation speed of light emitted by the color pixels is more accurately adjusted, and the brightness attenuation speed of light rays of each color along with the increase of a visual angle is more matched. It is understood that in other embodiments, the first type of sub-pixels of the same color light may further include more sub-pixels with different full widths at half maximum, and is not limited herein.
Further, the ratio of the difference between the full widths at half maximum of the first sub-pixel B11 and the second type sub-pixel B2 of the same color pixel to the difference between the full widths at half maximum of the second sub-pixel B12 and the second type sub-pixel B2 is 1/2. Illustratively, taking a blue pixel as an example, as an embodiment, the full width at half maximum of the second-type sub-pixel B2 of the blue pixel is 17nm, the full width at half maximum of the first sub-pixel B11 is 19nm, and the full width at half maximum of the second sub-pixel B12 is 21nm, then the difference between the full widths at half maximum of the first sub-pixel B11 and the second sub-pixel B2 of the blue pixel is 2nm, and the difference between the full widths at half maximum of the second sub-pixel B12 and the second sub-pixel B2 is 4nm, and the ratio of the two is 1/2. In this way, the full widths at half maximum of the first sub-pixel B11, the second sub-pixel B12 and the second type sub-pixel B2 of the same color pixel are increased in proportion or in a stepwise manner, so that the luminance decay rates of the respective color lights with the increase of the viewing angle are more easily matched, thereby effectively improving the color shift.
In some embodiments of the present application, the first type of sub-pixels of the same color pixel are disposed on at least one side of the second type of sub-pixels. Specifically, the first-type sub-pixel B1 of the same-color pixel may include a plurality of first-type sub-pixels B1 of the same-color pixel disposed at least one side of the second-type sub-pixel B2. For example, a plurality of first-type sub-pixels B1 of pixels of the same color may be disposed on one side of the second-type sub-pixel B2, or a plurality of first-type sub-pixels B1 may be disposed on a plurality of sides of the second-type sub-pixel B2. It should be understood that the full width at half maximum of the first-type sub-pixel B1 of the same color pixel is greater than the full width at half maximum of the second-type sub-pixel B2, the second-type sub-pixel B2 is more easily attenuated than the first-type sub-pixel B1, and the first-type sub-pixel B1 can compensate for the attenuation of the brightness of the second-type sub-pixel B2 by disposing a plurality of first-type sub-pixels B1 on at least one side of the second-type sub-pixel B2, so that the attenuation speed of the brightness of each color with the increase of the viewing angle is more matched, and the blue light in the pixel unit is more uniform.
In particular, a plurality of first type sub-pixels of the same color light may be arranged around the second type sub-pixels. Taking the third color pixel as an example, a plurality of the first type sub-pixels B1 of the third color pixel may be disposed around the first color pixel R, the second color pixel G, and the second type sub-pixel B2. In this way, each of the first-type sub-pixels B1 can perform attenuation compensation on the brightness of the second-type sub-pixel B2, so that the brightness attenuation speed of the light rays with more uniform display and colors is more matched with the increase of the viewing angle. In a preferred embodiment, the light emitted by the plurality of first-type sub-pixels has full widths at half maximum of at least two different sizes, for example, the first-type sub-pixel B1 of the third color pixel includes a plurality of first sub-pixels B11 and a plurality of second sub-pixels B12 having different full widths at half maximum, and the central connecting lines of the plurality of first sub-pixels B11 and the plurality of second sub-pixels B12 form a virtual polygon. The virtual polygon may be a regular polygon, the center of the second-type sub-pixel B2 coincides with the center of the virtual polygon, for example, in the embodiment shown in fig. 3, the virtual polygon is a regular quadrilateral, the first sub-pixel B11 and the second sub-pixel B12 are both rectangular, the first sub-pixel B11 and the second sub-pixel B12 are alternately arranged along the vertex of the virtual multi-deformation, and the second-type sub-pixel B2 is also rectangular, and the center of the second-type sub-pixel B2 coincides with the center of the regular quadrilateral. This is beneficial to the uniformity of the sub-pixel arrangement, so as to achieve better display effect.
In some embodiments, the first color pixel R and the second color pixel G each also include a plurality, and the plurality of first color pixels R and the plurality of second color pixels G are symmetrically disposed at the center of the virtual polygon. In the embodiment shown in fig. 3, the first color pixel R and the second color pixel G are two and are divided into two pixel subgroups, and one pixel subgroup includes one first color pixel R and one second color pixel G. Two pixel sub-groups are symmetrically spaced on opposite sides of the second type sub-pixel B2. Therefore, the blue sub-pixels, the red sub-pixels and the green sub-pixels are more uniformly distributed, and the brightness attenuation speeds of the blue light, the red light and the green light along with the increase of the visual angle are more matched.
Fig. 6 shows a schematic layout of a pixel unit in a further embodiment of the present application.
In other embodiments of the present application, the first-type sub-pixel B1 and the second-type sub-pixel B2 of the same color pixel each include a plurality. For example, a part of the first-type sub-pixels B1 and the plurality of second-type sub-pixels B2 of the third-color pixel are disposed around the first-type sub-pixels R, the second-color pixels G, and the remaining part of the first-type sub-pixels B1 of the third-color pixel. Specifically, as shown in fig. 6, the central connecting line of the first-type sub-pixel B1 and the second-type sub-pixel B2 of the third color pixel forms a virtual polygon, and one first-type sub-pixel B1 is further disposed in the virtual polygon. In one embodiment, the full width at half maximum of the first-type sub-pixel B1 of the third color pixel may be 19nm or 21nm, and the full width at half maximum of the second-type sub-pixel B2 may be 17nm, so that the difference between the full width at half maximum of the first-type sub-pixel B1 and the full width at half maximum of the second-type sub-pixel B2 may be 2nm or 4 nm. In this way, a blue sub-pixel with a wider wavelength range surrounds the red sub-pixel and the green sub-pixel, and the first type sub-pixel B1 adjacent to the red sub-pixel and the green sub-pixel is arranged in the virtual polygon, so that the luminance decay speed of the blue light and the red and green light is more matched with the increase of the viewing angle. As a preferred embodiment, the center of the first-type sub-pixel B1 located in the virtual polygon coincides with the center of the virtual polygon, and the first-type sub-pixel B1 and the second-type sub-pixel B2 forming the virtual polygon are symmetrically arranged with respect to the center of the virtual polygon. Therefore, the blue light is displayed more uniformly, and the brightness attenuation speed of the blue light, the red light and the green light along with the increase of the visual angle is further matched, so that the color cast is effectively improved.
Further, the light emitting area of the first-type sub-pixel B1 of the third-color pixel located within the virtual polygon is smaller than the light emitting area of the first-type sub-pixel B1 forming the virtual polygon. Therefore, enough arrangement space is reserved for the red sub-pixel and the green sub-pixel, and the display effect is improved.
Fig. 7 is a block flow diagram illustrating a brightness compensation method for a display panel according to an embodiment of the present application.
Based on the display panel 100, an embodiment of the present application further provides a brightness compensation method for the display panel 100, which includes the following steps:
s110: acquiring brightness attenuation parameters of light with different colors;
in some embodiments, the decay parameter value is a luminance decay value. Specifically, the brightness values of the first color light, the second color light, and the third color light at a plurality of different times may be acquired at set time intervals, and the attenuation parameter of each color light in the set time interval may be obtained according to the brightness value of each color light at different times. Illustratively, taking blue light as an example, the blue light is represented by t 0 Initial brightness L corresponding to time 0 Brightness value, decaying to t 1 Time L 1 The value of the attenuation parameter X t1-t0 ＝L 1 -L 0 。
Of course, in other embodiments, other parameter values having a mapping relation with the brightness value may also be used as the brightness attenuation parameter, for example, the change value of the current is used as the brightness attenuation parameter, which is not limited herein.
S120: compensating the first type sub-pixel and/or the second type sub-pixel of at least one color pixel according to a brightness attenuation parameter of light of different colors;
in some embodiments, the first type sub-pixel B1 and/or the second type sub-pixel B2 of at least one color pixel may be compensated according to a difference between luminance attenuation parameters of the respective color lights. For example, when the difference between the brightness attenuation parameter of the light of the third color and the brightness attenuation parameter of the light of the first color and/or the brightness attenuation parameter of the light of the second color is greater than a preset value, specifically may be 5%, the first-type sub-pixel B1 and/or the second-type sub-pixel B2 of the third color pixel are compensated. In particular, in an embodiment, the luminance compensation may be achieved by performing current compensation to the first type sub-pixel B1 and/or the second type sub-pixel B2.
Of course, in other embodiments, the preset value of the brightness attenuation parameter difference of each color may be set to other proportions, which are determined according to the specific application environment of the display panel 100, and is not limited herein.
Based on the same inventive concept, the present application also provides a display device including the display panel 100 in the above-described embodiment.
Specifically, the display device can be applied to the fields of mobile phone terminals, bionic electronics, electronic skins, wearable equipment, vehicle-mounted equipment, Internet of things equipment, artificial intelligence equipment and the like. For example, the display device may be a digital device such as a mobile phone, a tablet, a palmtop, an ipod, and a smart watch.
According to the pixel unit, the display panel, the brightness compensation method of the pixel unit and the display panel and the display device of the pixel unit, the brightness attenuation speed of the light emitted by the first type of sub-pixels of the same color along with the increase of the visual angle is different from the attenuation speed of the light emitted by the second type of sub-pixels along with the increase of the visual angle, the attenuation speed of each color of light can be adjusted by setting the number, the light emitting area and/or the arrangement mode of the first type of sub-pixels and the second type of sub-pixels, the brightness attenuation speed of each color of light along with the increase of the visual angle is more matched, the visual angle color cast is improved, and the power consumption and the color cast of a screen body are considered to be balanced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. A pixel unit is characterized by comprising pixels with at least three different light-emitting colors;
the pixel of at least one emission color comprises a first type sub-pixel and a second type sub-pixel with different emission materials;
the full width at half maximum of the light emitted by the first type of sub-pixel of a same color pixel is greater than the full width at half maximum of the light emitted by the second type of sub-pixel; the same color pixel includes a plurality of first type sub-pixels that emit light having full widths at half maximum of at least two different sizes.
2. The pixel cell of claim 1, wherein the first type of sub-pixel of a same color pixel comprises a first sub-pixel and a second sub-pixel having different sizes of full widths at half maximum;
the ratio of the difference between the full widths at half maximum of the first and second type sub-pixels of a same color pixel to the difference between the full widths at half maximum of the second and second type sub-pixels is 1/2.
3. The pixel cell of claim 1, wherein the total area of light emission of the first type of sub-pixels of the same color is larger than the total area of light emission of the second type of sub-pixels.
4. A unit cell as claimed in claim 1, wherein the first type of sub-pixels of the same color are arranged on at least one side of the second type of sub-pixels.
5. The pixel cell of claim 4, wherein the first type of sub-pixels of the same color are plural, and the plural first type of sub-pixels of the same color are disposed around the second type of sub-pixels.
6. The pixel unit according to any one of claims 1 to 5, wherein the pixel unit comprises a first color pixel, a second color pixel and a third color pixel of different emission colors;
the wavelength of light emitted by the third color pixel is less than the wavelength of light emitted by the first color pixel and the second color pixel;
the third color pixel includes the first type sub-pixel and the second type sub-pixel having different light emitting materials.
7. The pixel cell of claim 6, wherein the third color pixel comprises a plurality of the first type sub-pixels;
the plurality of first type sub-pixels of the third color pixel are arranged around the first type sub-pixels of the first color pixel, the second color pixel and the second type sub-pixels of the third color pixel.
8. The pixel cell of claim 7, wherein the first type of sub-pixel of the third color pixel comprises a plurality of first sub-pixels and a plurality of second sub-pixels, the first sub-pixels and the second sub-pixels having different sizes of full widths at half maximum;
the central connecting lines of the plurality of first sub-pixels and the plurality of second sub-pixels form a virtual polygon; the first sub-pixels and the second sub-pixels are alternately arranged along the vertexes of the virtual polygon.
9. The pixel cell of claim 6, wherein the third color pixel comprises a plurality of the first type sub-pixels and a plurality of the second type sub-pixels;
the first-type sub-pixels and the plurality of second-type sub-pixels of a part of the third-color pixels are arranged around the first-type sub-pixels, the second-color pixels and the rest of the first-type sub-pixels of the third-color pixels.
10. A display panel comprising a plurality of pixel cells according to any one of claims 1 to 9.
11. A display device characterized by comprising the display panel according to claim 10.
12. A brightness compensation method of a display panel is characterized in that the display panel comprises at least three pixels with different luminous colors; the pixel of at least one light-emitting color comprises a first type sub-pixel and a second type sub-pixel which have different light-emitting materials; the full width at half maximum of the light emitted by the first type of sub-pixel of a same color pixel is greater than the full width at half maximum of the light emitted by the second type of sub-pixel; the same-color pixels comprise a plurality of first-type sub-pixels, and the light emitted by the plurality of first-type sub-pixels has full widths at half maximum of at least two different sizes;
the method comprises the following steps:
acquiring brightness attenuation parameters of light with different colors;
the first type of sub-pixels and/or the second type of sub-pixels of at least one color pixel are compensated according to a brightness attenuation parameter of light of different colors.
13. The luminance compensation method of a display panel according to claim 12, wherein the display panel includes a first color pixel, a second color pixel, and a third color pixel of different emission colors; the wavelength of light emitted by the third color pixel is less than the wavelength of light emitted by the first color pixel and the second color pixel;
the method comprises the following steps:
and when the difference between the brightness attenuation parameter of the light of the third color and the brightness attenuation parameter of the light of the first color and/or the brightness attenuation parameter of the light of the second color is larger than a preset value, compensating the first type sub-pixel and/or the second type sub-pixel of the third color.
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CN110212011A (en) * 2019-07-12 2019-09-06 昆山国显光电有限公司 A kind of display panel and display device
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