CN109300434B - Display device and adjusting method of viewing angle chromatic aberration thereof - Google Patents
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Abstract
The invention discloses a display device and a method for adjusting the viewing angle chromatic aberration thereof. The display device comprises a plurality of pixels, the pixels comprise a plurality of sub-pixels with different colors, and the adjusting method comprises the following steps: respectively measuring the brightness curves of the sub-pixels with different colors under different viewing angles to obtain the brightness curve corresponding to the sub-pixel with each color; according to each brightness curve, respectively determining the brightness attenuation ratio corresponding to each color sub-pixel in the pixel at the first visual angle; acquiring a reference brightness curve; determining a reference attenuation ratio according to the reference brightness curve; and adjusting the brightness of the sub-pixel according to the difference between the brightness attenuation ratio and the reference attenuation ratio, so that the ratio of the brightness of the adjusted sub-pixel to the brightness of the sub-pixel at the 0-degree viewing angle is basically equal to the reference attenuation ratio. According to the invention, the color difference of the display device can be improved, and the display effect of the display device is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a method for adjusting the viewing angle chromatic aberration of the display device.
Background
Organic Light-Emitting Diodes (OLEDs) use organic materials as semiconductor materials in Light-Emitting Diodes, which emit Light when a current is passed through them. The OLED display technology has the advantages of self-luminescence, wide viewing angle, high contrast, low energy consumption and the like, and is widely applied to intelligent products such as mobile phones, digital cameras, notebook computers and the like. And is the research focus of numerous scholars at home and abroad at present due to the characteristics of light weight, thin thickness and bending resistance.
In the prior art, all OLED display devices have color shift phenomena in different degrees, and therefore, it is a technical problem that the present invention provides a display device capable of improving the color shift problem and a method for adjusting the viewing angle color difference thereof.
Disclosure of Invention
In view of the above, the present invention provides a display device and a method for adjusting a viewing angle color difference thereof, so as to improve a color shift problem of an organic light emitting display device.
In one aspect, the present invention provides a method for adjusting a viewing angle color difference of a display device.
The invention provides a method for adjusting the visual angle chromatic aberration of a display device, wherein the display device comprises a plurality of pixels, the pixels comprise a plurality of sub-pixels with different colors, and the method for adjusting the visual angle chromatic aberration comprises the following steps: respectively measuring brightness curves of different sub-pixels of each color under different viewing angles to obtain a brightness curve corresponding to the sub-pixel of each color, wherein the coordinate of a first coordinate axis of the brightness curve is the viewing angle, the viewing angle is an included angle between an observed actual sight line direction and a front view direction, and the coordinate of a second coordinate axis is the brightness of the sub-pixel; respectively determining the brightness attenuation ratio corresponding to the sub-pixels of each color in the pixels at the first visual angle according to each brightness curve, wherein the brightness attenuation ratio is the ratio of the brightness at the first visual angle to the brightness at the visual angle of 0 degree in the same brightness curve; acquiring a reference brightness curve, wherein the coordinate of a first coordinate axis of the reference brightness curve is a viewing angle, and the coordinate of a second coordinate axis of the reference brightness curve is the target brightness of the sub-pixel; determining a reference attenuation ratio according to a reference brightness curve, wherein the reference attenuation ratio is the ratio of the brightness at the first view angle to the brightness at the 0-degree view angle in the reference brightness curve; and adjusting the brightness of the sub-pixel according to the difference between the brightness attenuation ratio and the reference attenuation ratio, so that the ratio of the brightness of the adjusted sub-pixel to the brightness of the sub-pixel at the 0-degree viewing angle is basically equal to the reference attenuation ratio.
In another aspect, the present invention provides a display device.
The display device includes: a display panel, a memory, and a processor, wherein: the display panel comprises a plurality of pixels, and the pixels comprise a plurality of sub-pixels with different colors; the memory is used for storing a computer program; when the processor executes the computer program, the method for adjusting the viewing angle chromatic aberration of any display device provided by the invention is realized.
In yet another aspect, a display device is provided.
The display device includes: a display panel, a memory, and a processor, wherein: the display panel comprises a plurality of pixels, and the pixels comprise a plurality of sub-pixels with different colors; the storage stores gray scale corresponding relation tables corresponding to the sub-pixels of various colors, wherein the gray scale corresponding relation table corresponding to the sub-pixel of each color comprises the corresponding relation between the initial gray scale and the target gray scale of the sub-pixel at each visual angle, and the target gray scale corresponding to the sub-pixel at the first visual angle is calculated by adopting the following formula:
wherein d2 is a target gray scale, d1 is an initial gray scale, γ is a Gamma value of the display device, Δ is a difference value obtained by subtracting a reference attenuation ratio from a brightness attenuation ratio, the reference attenuation ratio is a ratio of brightness at a first view angle to brightness at a 0-degree view angle in a reference brightness curve, coordinates of a first coordinate axis of the reference brightness curve are view angles, coordinates of a second coordinate axis are target brightness of the sub-pixels, the view angle is an included angle between an actual observed visual line direction and a front view direction, the brightness attenuation ratio is a ratio of the brightness at the first view angle to the brightness at the 0-degree view angle in the same brightness curve, the coordinates of the first coordinate axis of the brightness curve are the view angles, and the coordinates of the second coordinate axis are the brightness of the sub-pixels; the processor controls the brightness of each sub-pixel by searching the gray scale corresponding relation table.
Compared with the prior art, the display device and the method for adjusting the viewing angle chromatic aberration thereof provided by the invention at least realize the following beneficial effects: for pixels under a certain viewing angle, the brightness attenuation ratio of each color under the viewing angle is respectively determined in the brightness curves corresponding to the sub-pixels with different colors, then the brightness of the sub-pixels is respectively adjusted according to the difference between the brightness attenuation ratio and the reference attenuation ratio, and the material difference is compensated through the adjustment amount, so that the brightness attenuation degree of each sub-pixel at the same viewing angle position is unified, the color cast problem is improved, and the display effect of the display panel is improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a display device according to the prior art;
fig. 2 is a flowchart illustrating a method for adjusting a viewing angle difference of a display device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a luminance curve of a display device according to an embodiment of the invention;
FIG. 4 is a flowchart illustrating a step of adjusting the brightness of a sub-pixel in a method for adjusting the viewing angle difference of a display device according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for adjusting a viewing angle difference of a display device according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a display device according to an embodiment of the invention;
FIG. 7 is a schematic diagram of another display device according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another display device according to an embodiment of the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In order to improve the color shift problem of the OLED display device, the inventors have conducted the following research on a display device in the related art:
fig. 1 is a schematic diagram of a display device in the prior art, as shown in fig. 1, the display device is a curved display device, or is in a curved state in a certain state, or a certain region is in a curved state, or the like, in any case, because pixels at different radians have different front-view directions, when a certain observation position is reached, a part of the pixels are not viewed in the front-view direction. As shown in fig. 1, a direction a 'is a front view direction of the pixel a', a direction B 'is a front view direction of the pixel B', wherein the pixel a 'is taken as a tangent point, a direction perpendicular to a tangent line on the panel is the front view direction of the pixel a', the pixel B 'is taken as a tangent point, a direction perpendicular to a tangent line on the panel is the front view direction of the pixel B', and when the observation position is in the direction a ', the actual viewing direction c' of the pixel B 'does not lie in the front view direction for the pixel B', and the front view direction B 'of the pixel B' has a certain angle α ', which is a viewing angle of the pixel B'.
In the OLED display device, the pixels include sub-pixels having different colors, and the sub-pixels having different colors are formed of different light emitting materials. The inventors further studied and found that, in an oblique viewing direction (non-front viewing direction, viewing angle is not 0), the luminance of the light-emitting material is attenuated to some extent, and the luminance attenuation degree of different light-emitting materials is different even in the same viewing angle, that is, for the above-mentioned pixel B ', when the observation position is located in the direction a', the luminance attenuation degree of different light-emitting materials is different, that is, the luminance attenuation degree of the sub-pixels of different colors of the pixel B 'is different, so that the pixel B' may have color cast when viewed at the observation position. If the pixel B 'is composed of sub-pixels of three colors of red, green and blue, the luminance of the red sub-pixel is attenuated to the minimum when viewed from the observation position in the figure, and then the pixel B' is shifted to red.
In order to alleviate the color shift problem caused by the different brightness attenuation degrees of different luminescent materials in the oblique viewing direction, the applicant provides a display device and a method for adjusting the viewing angle color difference thereof, which perform brightness adjustment on sub-pixels in the oblique viewing direction, so that the brightness attenuation ratio of each sub-pixel in the same pixel after adjustment can be basically equal to a reference attenuation ratio, thereby the brightness attenuation ratios of each sub-pixel in the same pixel after adjustment are consistent, avoiding the color shift caused by the different brightness attenuation degrees, and improving the display effect of the OLED display device.
Embodiments of the display device and the method for adjusting the viewing angle color difference thereof according to the present invention will be described in detail below.
In one embodiment, the display device includes a display panel, wherein the display panel includes a plurality of pixels, each pixel includes a plurality of sub-pixels with different colors, for example, the pixels include sub-pixels with three colors of red, green and blue, the pixels display corresponding colors by controlling the brightness of each sub-pixel in the pixels, and all the pixels display respective colors through the display panel, so as to realize image display, and the sub-pixels with different colors in the display panel include different luminescent materials, and the different luminescent materials have the difference that: the brightness of different luminescent materials decays to different degrees in oblique view, for example, the luminescent material may be an organic luminescent material. When the display panel is a curved panel, or the display panel has a bending area, or a part of the display panel is in a bending state in a certain use state, or other display panels cannot be simultaneously in a front view direction, the adjustment method for the viewing angle color difference of the display device provided by the embodiment is used for adjusting. Taking an example of adjusting any pixel at any viewing angle in an oblique viewing direction, that is, an included angle between an actual viewing direction and a front viewing direction is any angle different from 0, fig. 2 is a flowchart illustrating a method for adjusting a viewing angle color difference of a display device according to an embodiment of the present invention, where the method for adjusting the viewing angle color difference of the display device in this embodiment includes the following steps S101 to S105:
step S101: and respectively measuring the brightness of the sub-pixels with different colors under different viewing angles to obtain a brightness curve corresponding to the sub-pixel with each color.
Fig. 3 is a schematic diagram of a luminance curve of a display device according to an embodiment of the present invention, and as shown in fig. 3, fig. 3 shows luminances of three color sub-pixels, namely, luminance curves corresponding to the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B, at different viewing angles, where a coordinate of a first coordinate axis of the luminance curve is a viewing angle, and the viewing angle is an included angle between an actual viewing direction and a front viewing direction; the coordinate of the second coordinate axis is the luminance of the sub-pixel, and optionally, the coordinate of the second coordinate axis is the luminance after normalization, where the luminance of the sub-pixel when the viewing angle is 0 may be used as the reference luminance for normalization during normalization, and the viewing angle is 0, that is, the actual viewing direction is the front viewing direction. For example, the luminance of the red sub-pixel R at a viewing angle of 20 degrees is about 1.04, the luminance of the red sub-pixel R at a viewing angle of 40 degrees is about 0.72, and the curve formed by the luminance of the red sub-pixel R at each viewing angle is the luminance curve corresponding to the red sub-pixel R.
During measurement, the measurement is carried out under the same brightness parameter, sub-pixels under different viewing angles are controlled to display under the same initial brightness, and then the actual brightness of the display is measured. And (3) the actual brightness under the 0 visual angle is equal to the initial brightness, the initial brightness is taken as the reference brightness, the measured actual brightness under different visual angles is subjected to normalization processing, and the processed brightness forms the value of the second coordinate axis of the brightness curve. After normalization processing is carried out on the actual brightness, the actual brightness can be mapped in a range of (0, 1), the method is more convenient and faster, and meanwhile, in the invention, sub-pixels with different colors need to be processed respectively, so that for a processor, the data processing burden can be reduced, and the display response speed can be increased.
Step S102: and respectively determining the brightness attenuation ratio corresponding to the sub-pixel of each color in the pixel at the first visual angle according to each brightness curve.
The brightness attenuation ratio corresponding to a color sub-pixel at a certain viewing angle is the ratio of the brightness at the viewing angle to the brightness at the viewing angle of 0 degree in the brightness curve of the color sub-pixel.
Taking the first viewing angle as an example of a 60-degree viewing angle, with reference to fig. 3, for the luminance attenuation ratio corresponding to the red sub-pixel R in the pixel at the 60-degree viewing angle, according to the luminance curve corresponding to the red sub-pixel R, it may be determined that the luminance of the red sub-pixel R at 0 degree is 1, the luminance at the 60-degree viewing angle is 0.28, and then it may be determined that the luminance attenuation ratio corresponding to the red sub-pixel R at the 60-degree viewing angle is 0.28; for the brightness attenuation ratio corresponding to the blue sub-pixel B in the pixel at the viewing angle of 60 degrees, according to the brightness curve corresponding to the blue sub-pixel B, it may be determined that the brightness of the blue sub-pixel B at 0 degree is 1, and the brightness at the viewing angle of 60 degrees is 0.38, and then it may be determined that the brightness attenuation ratio corresponding to the blue sub-pixel B at the viewing angle of 60 degrees is 0.38; the luminance attenuation ratio corresponding to the green sub-pixel G of the pixel at the viewing angle of 60 degrees is equal to the luminance attenuation ratio corresponding to the red sub-pixel R, and is 0.28.
Step S103: a reference luminance curve is obtained.
The reference brightness curve is a target brightness curve for reference, the coordinate of the first coordinate axis of the reference brightness curve is a viewing angle, the coordinate of the second coordinate axis is target brightness of the sub-pixels, the reference brightness curve can be preset according to the characteristics of the panel or display requirements, and a brightness curve corresponding to the sub-pixel of any color in the step S101 can be selected, wherein when the brightness curve corresponding to the sub-pixel of a certain color is set as the reference brightness curve, the sub-pixel of the color does not need to be adjusted during brightness adjustment, complexity of the viewing angle color difference adjustment method can be simplified, and speed of display processing is increased. As shown in fig. 3, when the luminance curve corresponding to the green sub-pixel is selected as the reference luminance curve, the adjustment amount of another sub-pixel during the luminance adjustment is reduced.
Alternatively, the coordinates of the second coordinate axis of the reference luminance curve may be preset to be constant, for example, the target luminance of the sub-pixels is not attenuated, and the luminance curve with the coordinates of the second coordinate axis being constant to be constant 1 is used as the reference luminance curve, so that the pixels at each viewing angle of the display panel are not color cast, but are uniform in luminance, and the uniformity of the entire display of the display panel is improved. Alternatively, the luminance of the pixel at a large viewing angle may be increased by a reference luminance curve that monotonically increases. By setting different reference brightness curves, on the basis of ensuring that the brightness attenuation degree of each color sub-pixel is the same, the brightness of each color sub-pixel can be further not attenuated or even increased, so that the diversified display requirements of the display panel are increased.
Step S104: a reference attenuation ratio is determined from the reference luminance curve.
Wherein the reference attenuation ratio is a ratio of luminance at the first viewing angle to luminance at the 0 degree viewing angle in the reference luminance curve.
Step S105: and adjusting the brightness of the sub-pixel according to the difference between the brightness attenuation ratio and the reference attenuation ratio, so that the ratio of the brightness of the adjusted sub-pixel to the brightness of the sub-pixel at the 0-degree viewing angle is basically equal to the reference attenuation ratio.
For each sub-pixel of the pixel at the first viewing angle, when the brightness attenuation ratio corresponding to a certain sub-pixel has a difference with the reference attenuation ratio, the brightness of the sub-pixel is adjusted according to the difference between the two, specifically, when the brightness attenuation ratio corresponding to the sub-pixel is greater than the reference attenuation ratio, the brightness of the sub-pixel is reduced, when the brightness attenuation ratio corresponding to the sub-pixel is less than the reference attenuation ratio, the brightness of the sub-pixel is increased, and finally, the ratio of the brightness of the adjusted sub-pixel to the brightness of the sub-pixel at the viewing angle of 0 degree is basically equal to the reference attenuation ratio. After adjustment, when the ratio of the brightness of each sub-pixel to the brightness of each sub-pixel at the 0-degree viewing angle is substantially equal to the reference attenuation ratio, that is, the brightness attenuation of each sub-pixel is consistent, so that color cast caused by inconsistent brightness attenuation is overcome.
It should be noted that "substantially equal" here is to distinguish "absolutely equal", and includes "absolutely equal" and "relative equal" accommodating errors, and there is a certain error in the adjustment process due to the calculation accuracy, the control accuracy and other reasons, and such error causes the difference between the ratio of the adjusted luminance of the sub-pixel to the luminance thereof at the viewing angle of 0 degree and the reference attenuation ratio within an acceptable range, in this case, the "relative equal" accommodating errors.
By adopting the method for adjusting the viewing angle chromatic aberration of the display device provided by the embodiment, for a pixel under a certain viewing angle, the brightness attenuation ratio of each color under the viewing angle is respectively determined in the brightness curves corresponding to the sub-pixels with different colors, then the brightness of the sub-pixels is respectively adjusted according to the difference between the brightness attenuation ratio and the reference attenuation ratio, and the material difference is compensated through the adjustment amount, so that the brightness attenuation degrees of the sub-pixels at the same viewing angle position are unified, thereby improving the color cast problem and improving the display effect of the display panel.
Further, after the brightness attenuation degrees of the sub-pixels with different colors at the same viewing angle position are unified by adjusting the brightness of the sub-pixels, the brightness of the sub-pixels can be further adjusted according to the unified brightness attenuation degree (i.e. the reference attenuation ratio), so that the brightness of each color sub-pixel is not attenuated or the attenuation degrees of each color sub-pixel are uniformly reduced, thereby reducing the brightness difference between the pixels at the large viewing angle and the pixels at the 0 viewing angle.
Fig. 4 is a flowchart of a step of adjusting the brightness of a sub-pixel in a method for adjusting a viewing angle color difference of a display device according to an embodiment of the present invention, in an embodiment, as shown in fig. 3, the method provided in this embodiment includes steps S101 to S105, and the related description may refer to the above, which is not repeated herein, and it is important to explain in this embodiment that, as shown in fig. 4, when adjusting the brightness of a sub-pixel at a first viewing angle, the method may further include the following steps:
step S1051: and acquiring an initial gray scale corresponding to the sub-pixel.
Step S1052: the initial luminance of the sub-pixels is calculated from the initial gray scale.
The gray scale is a digital signal of brightness, and the corresponding relation between the gray scale and the brightness is gamma relation. When displaying an image, the brightness of the sub-pixels is usually controlled by controlling the gray scale, and after obtaining the initial gray scale, the initial brightness of the sub-pixels can be obtained according to the gamma relationship between the initial gray scale and the display panel.
When a certain frame of image is displayed, the gray scale corresponding to each sub-pixel at the first visual angle, namely the gray scale before adjustment, is an initial gray scale, if the actual observation position is in the front view direction, the sub-pixels are controlled to achieve the initial brightness when being displayed according to the initial gray scale, and the actual observation position is not in the front view direction, certain brightness attenuation exists, so that the actually achieved brightness is not the initial brightness, and the actually achieved brightness of the sub-pixels with different colors is not equal-ratio-change relative to the respective initial brightness, namely, the brightness attenuation ratios are not consistent, at the moment, the overall brightness is reduced, and the chromaticity is inclined towards the color of the sub-pixel with relatively small attenuation degree and relatively large brightness attenuation, so that color cast occurs.
Step S1053: and calculating the target brightness of the sub-pixel according to the initial brightness and the difference between the brightness attenuation ratio and the reference attenuation ratio.
On the basis of the initial brightness, according to the difference size and the direction of the brightness attenuation ratio and the reference attenuation ratio, wherein the brightness attenuation ratio is larger than the reference attenuation ratio and is in one direction, the brightness attenuation degree is small at the moment, the initial brightness needs to be reduced, the brightness attenuation ratio is smaller than the reference attenuation ratio and is in the other direction, the brightness attenuation degree is large at the moment, the initial brightness needs to be increased, the increase or reduction amount is the product of the difference size of the brightness attenuation ratio and the reference attenuation ratio and the initial brightness, the initial brightness is adjusted according to the mode, the brightness obtained after adjustment is the target brightness, and when the sub-pixel is controlled according to the target brightness, the ratio of the actually displayed brightness to the initial brightness is the reference attenuation ratio.
Step S1054: and calculating the target gray scale corresponding to the sub-pixel according to the target brightness of the sub-pixel.
And calculating to obtain the target gray scale according to the gamma relation between the target brightness and the display panel.
Step S1055: and controlling the brightness of the sub-pixels according to the target gray scale.
In this step, when the luminance of the sub-pixel is controlled in accordance with the target gray scale, the ratio of the actual luminance of the sub-pixel to the luminance thereof at the viewing angle of 0 degree can be made substantially equal to the reference attenuation ratio.
The method for adjusting the viewing angle color difference of the display device provided by the embodiment achieves the purpose of adjusting the brightness by adjusting the gray scale of the sub-pixels, and for the control part of the display device, only the initial gray scale needs to be translated into the target gray scale according to the calculation method, and then the control part is controlled according to the target gray scale, only the control parameters need to be changed, and the control logic does not need to be changed.
In one embodiment, when calculating the target gray level of the sub-pixel, the following formula can be used for calculation:
wherein d2 is the target gray scale of the sub-pixel, d1 is the initial gray scale, γ is the Gamma value of the display device, and Δ is the difference of the reference attenuation ratio minus the brightness attenuation ratio.
Specifically, d1γTo initial brightness, d1γ(1+ Δ) is target luminance, d1γΔ is an amount to be adjusted when the target brightness is adjusted based on the initial brightness, Δ < 0 when the brightness attenuation ratio is greater than the reference attenuation ratio, and d1γ*Δ＜0，d1γ*(1+Δ)＜d1γThat is, the initial brightness is reduced to obtain the target brightness, the smaller brightness attenuation degree is compensated by the smaller target brightness, when the brightness attenuation ratio is smaller than the reference attenuation ratio, delta > 0, d1γ*Δ＞0，d1γ*(1+Δ)＞d1γThat is, the initial brightness is increased to obtain the target brightness, and the larger target brightness is used to compensate the larger brightness attenuation degree.
Fig. 5 is a flowchart of steps of another method for adjusting a chromatic aberration of an angle of view of a display device according to an embodiment of the present invention, and in an embodiment, as shown in fig. 5, the method for adjusting a chromatic aberration of an angle of view of a display device according to the embodiment includes steps S201 to S212, where some of the steps are described in detail above, and relevant points may be referred to each other.
Step S201: and respectively measuring the brightness of the sub-pixels with different colors under different viewing angles to obtain a brightness curve corresponding to the sub-pixel with each color.
Step S202: and respectively determining the brightness attenuation ratio corresponding to the sub-pixel of each color in the pixel at the first visual angle according to each brightness curve.
Step S203: a reference luminance curve is obtained.
Step S204: a reference attenuation ratio is determined from the reference luminance curve.
Step S205: and acquiring an initial gray scale corresponding to each color sub-pixel in the pixel at the first visual angle.
Step S206: and respectively calculating the initial brightness of each color sub-pixel according to each initial gray scale.
Step S207: and calculating the target brightness of each color sub-pixel according to the initial brightness of each color sub-pixel and the difference between the brightness attenuation ratio and the reference attenuation ratio.
Step S208: and calculating the target gray scale corresponding to each color sub-pixel according to the target brightness of each color sub-pixel.
Step S209: and aiming at the sub-pixels of each color, forming a gray scale corresponding relation table according to the initial gray scale and the target gray scale corresponding to the sub-pixels at the first visual angle.
Step S210: when the brightness of a sub-pixel of a certain color is controlled, the gray scale corresponding relation table is determined according to the color of the sub-pixel.
Step S211: and searching a target gray scale corresponding to the initial gray scale at the first visual angle in the determined gray scale corresponding relation table.
Step S212: and controlling the brightness of the sub-pixels according to the searched target gray scale.
By adopting the method for adjusting the viewing angle color difference of the display device provided by the embodiment, the gray scale corresponding relation table corresponding to the initial gray scale and the target gray scale can be formed in advance, the corresponding relation table is arranged in the storage device of the display device, the target gray scale can be obtained only by looking up the table in the display control process, and then the control is carried out according to the target gray scale, so that the display control speed can be accelerated.
In one embodiment, for a display device, a luminance curve corresponding to a green sub-pixel is used as a reference luminance curve, a value is taken as an initial gray level for each interval unit gray level between 0 gray level and 255 gray levels for a red sub-pixel and a blue sub-pixel, and then a target gray level corresponding to each initial gray level at each viewing angle is calculated, so as to form a gray level corresponding relation table corresponding to the initial gray level and the target gray level. Table 1 is a gray scale correspondence table of the blue sub-pixel, table 2 is a gray scale correspondence table of the red sub-pixel, in each correspondence table, the first row data is an initial gray scale, the first column data is a viewing angle, and a position where a column where an initial gray scale is located intersects a row where a viewing angle is located is a target gray scale corresponding to the initial gray scale at the viewing angle. The method for calculating the target gray scale from the initial gray scale can adopt any one of the methods for calculation, and for convenience of control, the calculated target gray scale value can be rounded within the control precision range.
In the actual display control process, after the color, the initial gray scale and the viewing angle of a certain sub-pixel are determined, a gray scale relation corresponding table is determined according to the color, then the gray scale relation corresponding table is inquired through the initial gray scale and the viewing angle, the target gray scale of the sub-pixel is obtained in the table, and the sub-pixel is controlled according to the target gray scale, wherein the initial gray scale is determined according to the currently displayed image, the viewing angle can be determined according to the bending degree of the panel and the position of the sub-pixel, and the content and the technical means for determining the viewing angle can adopt the method in the prior art, and are not repeated here.
Fig. 6 is a schematic diagram of a display device according to an embodiment of the present invention, and in an embodiment, as shown in fig. 6, the display device is an organic light emitting display device, and the display device includes an array substrate 10, an organic light emitting device layer 20, and an encapsulation layer 30. The array substrate 10 is provided with a pixel circuit for controlling the brightness of the organic light emitting device in the organic light emitting device layer 20, the driving chip transmits a corresponding driving voltage signal to the organic light emitting device through the pixel circuit according to the target gray scale, and the organic light emitting device emits light. The organic light emitting device layer 20 includes a plurality of organic light emitting devices each including two electrodes disposed opposite to each other and a light emitting material layer disposed between the two electrodes, each of the organic light emitting devices corresponding to one of the sub-pixels. The encapsulation layer 30 may be a flexible encapsulation, such as a thin film encapsulation process, or a rigid glass encapsulation. The light emitting material layer adopts different organic light emitting materials so that the organic light emitting device can generate light with different colors, and the brightness attenuation ratios of the sub-pixels with different colors under the same non-0 viewing angle are different, wherein the brightness of the sub-pixels under the non-0 viewing angle can be adjusted by adopting any one of the above adjusting methods for the viewing angle color difference of the display device.
Fig. 7 is a schematic diagram of another display device provided by the embodiment of the invention, and in an embodiment, as shown in fig. 7, the display device has a non-bending region a2 and a bending region a1, wherein the observation position is generally located in the positive direction of the pixels in the non-bending region a1, and therefore, the viewing angle of the pixels in the bending region a2 is not 0 during normal use. In order to avoid color shift of the pixels in the bending region a2, in the display process, the luminance of the sub-pixels in the bending region a2 is adjusted, and the specific adjustment method may be any one of the above adjustment methods for the viewing angle color difference of the display device, so that the luminance attenuation degrees of the sub-pixels with different colors at the same viewing angle in the bending region a2 are the same, and the color shift degree in the bending region a2 is further reduced.
Fig. 8 is a schematic diagram of another display device according to an embodiment of the present invention, in an embodiment, as shown in fig. 8, the display device is a flexible display device, as shown in fig. 8, the display device has a bendable region A3, and the bendable region A3 can be folded along a certain direction, wherein a part of the display region of the flexible display device can be bent, or all the display regions of the flexible display device can be bent, the observation position is usually located in a certain fixed direction, during a normal use process, a color shift occurs in a pixel in which a front view direction is not consistent with a direction of the observation position in the bendable region A3, in order to avoid a color shift in the pixel in the bendable region A3, during a display process, a luminance of a sub-pixel in the bendable region A3 is adjusted by using any of the above adjustment methods for adjusting a viewing angle color shift of the display device, so that the brightness attenuation degrees of the sub-pixels with different colors at the same viewing angle in the bendable region A3 are consistent, and the color cast degree in the bendable region A3 is further reduced.
In one embodiment, a display device includes: the display panel comprises a plurality of pixels, the pixels comprise a plurality of sub-pixels with different colors, the brightness attenuation degrees of the sub-pixels with different colors at the same viewing angle are different, the memory is used for storing a computer program, and when the processor executes the computer program, the method for adjusting the viewing angle color difference of any display device provided by the invention is realized, the corresponding technical effects are achieved, and the description is omitted.
In one embodiment, a display device includes: the display panel comprises a plurality of pixels, each pixel comprises a plurality of sub-pixels with different colors, and the brightness attenuation degrees of the sub-pixels with different colors at the same visual angle are different. The storage stores a gray scale corresponding relation table corresponding to the sub-pixels of each color, the gray scale corresponding relation table can be any one of the gray scale corresponding relation tables mentioned above, the corresponding technical effect is achieved, the description is omitted, and the processor controls the brightness of each sub-pixel by searching the gray scale corresponding relation table.
By the above embodiment, the method for adjusting the viewing angle color difference of the display device provided by the invention at least achieves the following beneficial effects:
for pixels under a certain viewing angle, the brightness attenuation ratio of each color under the viewing angle is respectively determined in the brightness curves corresponding to the sub-pixels with different colors, then the brightness of the sub-pixels is respectively adjusted according to the difference between the brightness attenuation ratio and the reference attenuation ratio, and the material difference is compensated through the adjustment amount, so that the brightness attenuation degree of each sub-pixel at the same viewing angle position is unified, the color cast problem is improved, and the display effect of the display panel is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A method for adjusting the viewing angle color difference of a display device, wherein the display device comprises a plurality of pixels, and the pixels comprise a plurality of sub-pixels with different colors, the method comprising:
respectively measuring the brightness of the sub-pixels with different colors under different viewing angles to obtain a brightness curve corresponding to the sub-pixels with each color, wherein the coordinate of a first coordinate axis of the brightness curve is the viewing angle, the viewing angle is an included angle between an observed actual sight line direction and a front view direction, and the coordinate of a second coordinate axis is the brightness of the sub-pixels;
according to each brightness curve, respectively determining a brightness attenuation ratio corresponding to each color sub-pixel in the pixel at a first visual angle, wherein the brightness attenuation ratio is the ratio of the brightness at the first visual angle to the brightness at a 0-degree visual angle in the same brightness curve;
acquiring a reference brightness curve, wherein the coordinate of a first coordinate axis of the reference brightness curve is the viewing angle, and the coordinate of a second coordinate axis of the reference brightness curve is the target brightness of the sub-pixel;
determining a reference attenuation ratio according to the reference brightness curve, wherein the reference attenuation ratio is the ratio of the brightness at the first viewing angle to the brightness at the 0-degree viewing angle in the reference brightness curve;
adjusting the luminance of the sub-pixel according to the difference between the luminance decay ratio and the reference decay ratio so that the ratio of the adjusted luminance of the sub-pixel to the luminance thereof at the viewing angle of 0 degrees is substantially equal to the reference decay ratio,
wherein the adjusting the brightness of the sub-pixels comprises:
acquiring an initial gray scale corresponding to the sub-pixel;
calculating the initial brightness of the sub-pixels according to the initial gray scale;
calculating the target brightness of the sub-pixel according to the initial brightness and the difference between the brightness attenuation ratio and the reference attenuation ratio, wherein the amount of the increase or decrease of the initial brightness is the product of the difference between the brightness attenuation ratio and the reference attenuation ratio and the initial brightness;
calculating a target gray scale corresponding to the sub-pixel according to the target brightness of the sub-pixel; and
and controlling the brightness of the sub-pixels according to the target gray scale.
2. The method for adjusting chromatic aberration of viewing angle of a display device according to claim 1, wherein the target gray scale of the sub-pixel is calculated by using the following formula:
wherein d2 is the target gray scale of the sub-pixel, d1 is the initial gray scale, γ is the Gamma value of the display device, and Δ is the difference of the reference attenuation ratio minus the brightness attenuation ratio.
3. The method for adjusting the viewing angle color difference of a display device according to claim 2,
after calculating the target gray scale of the sub-pixel according to the target brightness of the sub-pixel, and before controlling the brightness of the sub-pixel according to the target gray scale, the step of adjusting the brightness of the sub-pixel further comprises: aiming at each color of sub-pixels, forming a gray scale corresponding relation table according to the initial gray scale and the target gray scale corresponding to the sub-pixels at the first visual angle;
the step of controlling the brightness of the sub-pixels according to the target gray scale comprises: determining the gray scale corresponding relation table according to the color of the sub-pixel; searching the target gray scale corresponding to the initial gray scale at the first visual angle of the sub-pixel in the determined gray scale corresponding relation table; and controlling the brightness of the sub-pixels according to the searched target gray scale.
4. The method for adjusting chromatic aberration of viewing angle of a display device according to claim 1, wherein the reference luminance profile is a luminance profile corresponding to a sub-pixel of one color included in the pixel.
5. The method of claim 1, wherein a coordinate of a second coordinate axis of the reference luminance profile is constant.
6. The method according to claim 1, wherein the pixels comprise red, green and blue sub-pixels.
7. The method for adjusting chromatic aberration of viewing angle of a display device according to claim 1, wherein the display device is an organic light emitting display device.
8. The method according to claim 1, wherein the display device comprises a bending region and a non-bending region, and the step of adjusting the brightness of the sub-pixel is to adjust the brightness of the sub-pixel in the bending region.
9. The method as claimed in claim 1, wherein the display device is a flexible display device and includes a bendable region, and the step of adjusting the brightness of the sub-pixels is to adjust the brightness of the sub-pixels in the bendable region.
10. A display device, comprising: a display panel, a memory, and a processor, wherein:
the display panel comprises a plurality of pixels, and the pixels comprise a plurality of sub-pixels with different colors;
the memory is used for storing a computer program;
when the processor executes the computer program, the method for adjusting the viewing angle color difference of the display device according to any one of claims 1 to 9 is implemented.
11. A display device, comprising: a display panel, a memory, and a processor, wherein:
the display panel comprises a plurality of pixels, and the pixels comprise a plurality of sub-pixels with different colors;
the memory is stored with gray scale corresponding relation tables corresponding to the sub-pixels of various colors, wherein the gray scale corresponding relation table corresponding to the sub-pixel of each color comprises the corresponding relation between the initial gray scale and the target gray scale of the sub-pixel at each view angle, and the target gray scale corresponding to the sub-pixel at the first view angle is calculated by adopting the following formula:
wherein d2 is the target gray scale, d1 is the initial gray scale, γ is a Gamma value of the display device, Δ is a difference value obtained by subtracting a brightness attenuation ratio from a reference attenuation ratio, the reference attenuation ratio is a ratio of brightness at the first viewing angle to brightness at a viewing angle of 0 degree in a reference brightness curve, a coordinate of a first coordinate axis of the reference brightness curve is a viewing angle, a coordinate of a second coordinate axis is the target brightness of the sub-pixel, the viewing angle is an included angle between an actual viewing direction and a front viewing direction, the brightness attenuation ratio is a ratio of brightness at the first viewing angle to brightness at the viewing angle of 0 degree in the same brightness curve, the coordinate of the first coordinate axis of the brightness curve is the viewing angle, and the coordinate of the second coordinate axis is the brightness of the sub-pixel;
and the processor controls the brightness of each sub-pixel by searching the gray scale corresponding relation table.
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