CN110751925B - Method and device for compensating brightness of curved display panel - Google Patents
Method and device for compensating brightness of curved display panel Download PDFInfo
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- CN110751925B CN110751925B CN201810821138.6A CN201810821138A CN110751925B CN 110751925 B CN110751925 B CN 110751925B CN 201810821138 A CN201810821138 A CN 201810821138A CN 110751925 B CN110751925 B CN 110751925B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The embodiment of the invention discloses a method and a device for compensating brightness of a curved-surface display panel. The method for compensating the brightness of the curved-surface display panel comprises the following steps: acquiring pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of the camera; the shooting direction of the camera is perpendicular to the plane where the non-bending part of the curved surface display panel is located; obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; determining the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling part along with the observation angle and the pixel brightness of each pixel at the bending part in the camera shooting direction; and performing brightness compensation according to the pixel brightness of each pixel at the bending part in the normal direction and the pixel brightness of each pixel at the non-bending part in the camera shooting direction. The technical scheme provided by the embodiment of the invention can solve the problem that the brightness of the whole surface deviates when the conventional display panel brightness compensation method is applied to a curved screen.
Description
Technical Field
The embodiment of the invention relates to the technical field of organic light-emitting display, in particular to a method and a device for compensating brightness of a curved-surface display panel.
Background
With the development of organic light emitting display technology, curved screens have been increasingly found in products such as mobile phones. Meanwhile, because of factors such as organic light emitting materials and manufacturing processes, the curved panel also has the same Mura (uneven brightness) phenomenon as a non-curved panel, and in order to overcome this disadvantage, it is also necessary to perform compensation of Demura (uneven brightness compensation) data on the curved panel.
In the existing Demura compensation technology, the brightness average value of the whole surface or a partial area of a display screen is generally taken as the brightness reference value of Demura compensation, each pixel on a display panel takes the brightness reference value as a target, and the aim of consistent brightness of the whole display panel is achieved by adjusting the actual gray scale of each pixel according to the 'gray scale-brightness' functional relation of each pixel.
However, because the difference between the brightness data acquired by the Demura camera at the curved portion of the curved screen and the brightness data acquired by the non-curved portion of the curved screen is large, the conventional Demura data processing method for the non-curved screen cannot achieve a good Demura compensation effect on the curved screen, and a series of adverse effects such as brightness deviation of the whole surface of the display panel before and after Demura compensation can be generated.
Disclosure of Invention
The invention provides a method and a device for compensating brightness of a curved display panel, which aim to solve the problem that the brightness of the whole curved display panel deviates when the conventional method for compensating the brightness of the curved display panel is applied to a curved screen.
In a first aspect, an embodiment of the present invention provides a method for compensating brightness of a curved display panel, including: acquiring pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of the camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved surface display panel is located;
obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle;
determining the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling part of the curved surface display panel along with the observation angle and the pixel brightness of each pixel at the bending part in the camera shooting direction;
and performing brightness compensation according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction.
Optionally, the sampling position of the curved display panel is a central position of a non-bending position of the curved display panel; the obtaining of the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle includes: acquiring the pixel brightness of the pixel at the central position of the non-bending part of the curved surface display panel at different observation angles; determining the attenuation coefficient of the pixel brightness of the sampling position of the curved surface display panel along with the observation angle according to the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at different observation angles and the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at the observation angle of 0 degree; the observation angle is an included angle between a pixel brightness obtaining direction and a normal direction of the pixel.
Optionally, the determining the pixel brightness of each pixel at the bend in the normal direction according to the attenuation coefficient of the pixel brightness of the curved display panel along with the observation angle and the pixel brightness of each pixel at the bend in the camera shooting direction includes: determining attenuation coefficients corresponding to the pixels at the bent part of the curved surface display panel at different observation angles according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles; and determining the pixel brightness of each pixel at the bent part of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bent part of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bent part of the curved surface display panel corresponding to different observation angles.
Optionally, the determining, according to the attenuation coefficient of the pixel brightness at the sampling position of the curved display panel along with the observation angle, the attenuation coefficient corresponding to each pixel at the bending position of the curved display panel at different observation angles includes: obtaining an attenuation coefficient-observation angle curve according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; and determining attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel according to the attenuation coefficient-observation angle curve.
Optionally, the determining, according to the attenuation coefficient of the pixel brightness at the sampling position of the curved display panel along with the observation angle, the attenuation coefficient corresponding to each pixel at the bending position of the curved display panel at different observation angles includes: and determining attenuation coefficients corresponding to different observation angles of each pixel at the bent part of the curved surface display panel by adopting an interpolation method according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
Optionally, the performing brightness compensation according to the pixel brightness of each pixel at the curved portion of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-curved portion of the curved surface display panel in the camera shooting direction includes: acquiring a pixel brightness reference value of the curved surface display panel according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction; acquiring a gray scale-brightness relation of each pixel of the curved surface display panel; determining a compensation gray-scale value corresponding to each gray scale of each pixel of the curved surface display panel according to the pixel brightness reference value of the curved surface display panel and the gray scale-brightness relation of each pixel of the curved surface display panel; and displaying according to the compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel.
In a second aspect, an embodiment of the present invention further provides a brightness compensation apparatus for a curved display panel, including:
the shooting brightness acquisition module is used for acquiring the pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of the camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved surface display panel is located;
the attenuation coefficient acquisition module is used for acquiring the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle;
the normal brightness acquisition module is used for determining the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling part of the curved surface display panel along with the observation angle and the pixel brightness of each pixel at the bending part in the camera shooting direction;
and the brightness compensation module is used for performing brightness compensation according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction.
Optionally, the sampling position of the curved display panel is a central position of a non-bending position of the curved display panel; the attenuation coefficient acquisition module includes: the brightness acquisition unit is used for acquiring the pixel brightness of the pixel at the central position of the non-bending part of the curved surface display panel at different observation angles; the attenuation coefficient acquisition unit is used for determining the attenuation coefficient of the pixel brightness of the sampling position of the curved surface display panel along with the observation angle according to the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at different observation angles and the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at the observation angle of 0 degree; the observation angle is an included angle between a pixel brightness obtaining direction and a normal direction of the pixel.
Optionally, the normal brightness obtaining module includes: the attenuation coefficient determining unit is used for determining attenuation coefficients corresponding to pixels at the bent part of the curved surface display panel at different observation angles according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles; and the normal brightness acquisition unit is used for determining the pixel brightness of each pixel at the bent part of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bent part of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bent part of the curved surface display panel corresponding to different observation angles.
Optionally, the attenuation coefficient determining unit includes: the attenuation curve acquiring subunit is used for acquiring an attenuation coefficient-observation angle curve according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; and the attenuation coefficient determining subunit is used for determining the attenuation coefficients corresponding to the different observation angles of the pixels at the bending part of the curved surface display panel according to the attenuation coefficient-observation angle curve.
Optionally, the attenuation coefficient determining unit is specifically configured to: and determining attenuation coefficients corresponding to different observation angles of each pixel at the bent part of the curved surface display panel by adopting an interpolation method according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
Optionally, the brightness compensation module includes: a reference value obtaining unit, configured to obtain a pixel brightness reference value of the curved surface display panel according to pixel brightness of each pixel at a bend of the curved surface display panel in a normal direction and pixel brightness of each pixel at a non-bend of the curved surface display panel in a camera shooting direction; the gray scale obtaining unit is used for obtaining the gray scale-brightness relation of each pixel of the curved surface display panel; the compensation gray scale obtaining unit is used for determining a compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel according to the pixel brightness reference value of the curved surface display panel and the gray scale-brightness relation of each pixel of the curved surface display panel; and the display unit is used for displaying according to the compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel.
The method and the device for compensating the brightness of the curved surface display panel provided by the embodiment of the invention have the advantages that the pixel brightness of each pixel on the whole curved surface display panel in the camera shooting direction is obtained by obtaining the pixel brightness of each pixel on the curved surface display panel in the direction perpendicular to the plane of the non-curved part of the curved surface display panel through the camera in the direction perpendicular to the plane of the non-curved part, the pixel brightness of each pixel on the curved part in the normal direction is obtained according to the attenuation coefficient of the pixel brightness along with the observation angle and the pixel brightness of each pixel on the curved part in the camera shooting direction, and then the pixel brightness of each pixel on the curved part in the normal direction and the pixel brightness of each pixel on the non-curved part in the camera shooting direction are integrated to compensate the brightness. And when obtaining the attenuation coefficient of the pixel brightness along with the observation angle, selecting the pixel from a sampling position on the curved surface display panel to measure the pixel brightness and the observation angle. The brightness compensation scheme provided by the embodiment of the invention can integrate the pixel brightness in the normal direction of each pixel at the bending part and the pixel brightness in the normal direction of each pixel at the non-bending part, and then carry out brightness compensation according to the integrated pixel brightness, thereby avoiding the problem that the difference between the pixel brightness at the bending part and the pixel brightness at the non-bending part acquired in the shooting direction of a camera is larger, avoiding the phenomena of whole surface brightness deviation and the like after the brightness compensation of a curved surface display panel, and obtaining good Demura compensation effect.
Drawings
FIG. 1 is a flowchart illustrating a method for compensating brightness of a curved display panel according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a curved display panel according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a bend provided by an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another curved display panel according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a brightness compensation method for a curved display panel according to another embodiment of the present invention;
FIG. 6 is a graph of attenuation coefficient versus viewing angle for a pixel at a sample, according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating a brightness compensation method for a curved display panel according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a luminance compensation apparatus for a curved display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
An embodiment of the present invention provides a method for compensating brightness of a curved display panel, and referring to fig. 1, fig. 1 is a flowchart of a method for compensating brightness of a curved display panel according to an embodiment of the present invention, where the method for compensating brightness of a curved display panel includes:
s101, acquiring pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of a camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved display panel is located.
Referring to fig. 2, fig. 2 is a cross-sectional view of a curved display panel according to an embodiment of the present invention, and in particular, fig. 2 is a cross-sectional view of a curved display panel 11 along a direction perpendicular to two curved sides, where the curved display panel 11 includes a non-curved portion B in a middle area and curved portions a on two sides of the non-curved portion B. The shooting direction of the camera for pixel brightness acquisition of the curved surface is a direction perpendicular to the plane of the non-curved portion B of the curved surface display panel 11, i.e., a direction x in fig. 2. When the camera obtains the pixel brightness of each pixel on the whole curved display panel 11, for the pixel at the non-curved portion B, the camera shooting direction is the normal direction of the pixel, and for the pixel at the curved portion a, the camera shooting direction and the normal direction of the pixel have a certain included angle, as shown in fig. 3, fig. 3 is a cross-sectional view of a curved portion provided by the embodiment of the present invention, and exemplarily, for the pixel N-1, the camera shooting direction x and the normal direction of the pixel N-1 existAngle phin-1For the pixel N, there is an angle phi between the camera shooting direction x and the normal direction of the pixel Nn. As can be seen from fig. 3, an included angle exists between the camera shooting direction x of the pixel at the bending portion a and the normal direction of the pixel, so that the difference between the pixel brightness of the curved-surface display panel 11 obtained at the bending portion a and the pixel brightness of the non-bending portion B in the camera shooting direction x is large, the pixel brightness of the curved-surface display panel 11 is measured and Demura compensated only by the pixel brightness in the camera shooting direction x, and the entire surface of the curved-surface display panel 11 is easily deviated, and the included angle exists between the camera shooting direction x of each pixel and the normal direction of the pixel, and the pixel brightness in the normal direction of each pixel at the bending portion a needs to be obtained, so that the pixel brightness of the entire curved-surface display panel can be accurately measured and Demura compensated.
S102, obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle.
Because the included angle between the camera shooting direction x of each pixel in the bend a and the normal direction of the pixel is different, if the pixel brightness in the normal direction of each pixel in the bend a is to be obtained, the change relationship between the pixel brightness of each pixel and the observation angle needs to be obtained, that is, the attenuation coefficient of the pixel brightness in the bend a along with the observation angle is obtained, optionally, the included angle between the pixel brightness obtaining direction and the normal direction of the pixel can be set as the observation angle. A sampling position can be selected, the attenuation coefficient of the pixel brightness of the pixel at the sampling position along with the observation angle is obtained, and the attenuation coefficient of the observation angle of each pixel at the bending position A in the camera shooting direction is calculated.
Optionally, the sampling position of the curved display panel 11 may be the central position of the non-curved position B of the curved display panel 11, as shown in fig. 4, fig. 4 is a schematic structural diagram of another curved display panel provided in the embodiment of the present invention, and the pixel brightness of each observation angle is measured by using the pixel at the central position of the non-curved position B.
Specifically, obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved display panel 11 with the observation angle includes: acquiring the pixel brightness of the pixel at the central position of the non-bending part B of the curved surface display panel 11 at different observation angles; and determining the attenuation coefficient of the pixel brightness of the curved display panel at the sampling position along with the observation angle according to the pixel brightness of the pixel at the central position of the non-bent part B of the curved display panel 11 at different observation angles and the pixel brightness of the pixel at the central position of the non-bent part B of the curved display panel 11 at the observation angle of 0 deg.
And obtaining the attenuation coefficients of the plurality of observation angles according to the attenuation coefficients of the plurality of observation angles, and obtaining the change relation of the pixel brightness of the central pixel along with the observation angles. Illustratively, as shown in fig. 4, the pixel brightness Lv in the normal direction of the pixel at the center position is obtained, and then a series of observation angles θ are selected1、θ2……θn… …, obtaining the pixel brightness Lv corresponding to the observation angle1、Lv2……Lvn… …, the attenuation coefficient D (theta) is obtained according to the corresponding relation between the observation angle and the pixel brightness. In a specific example, a damping coefficient D (θ) may be definedn)＝Lvnand/Lv. And may be based on D (θ)1)、D(θ2) And obtaining the variation relation of the pixel brightness along with the observation angle by waiting for each attenuation coefficient.
S103, determining the pixel brightness of each pixel at the bending position of the curved surface display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle and the pixel brightness of each pixel at the bending position in the camera shooting direction.
The attenuation coefficient of each pixel at the bend A in the camera shooting direction can be calculated according to the attenuation coefficient of the pixel brightness at the sampling position along with the observation angle, and the pixel brightness of each pixel at the bend A in the normal direction can be obtained according to the pixel brightness and the attenuation coefficient of each pixel at the bend A in the camera shooting direction. Illustratively, with continued reference to FIG. 3, if the pixel brightness of pixel N in the camera capture direction is LunObservation angle of phinFrom the attenuation coefficient D (θ) in the above examplen) The pixel N attenuation coefficient D (phi) can be estimatedn) Then the pixel brightness Lu in the normal direction of the pixel N is equal to Lθn/D(Φn)。
Alternatively, with continued reference to fig. 3, from the place where the curved display panel 11 starts to bend, there are rows 1 and 2 … … N … … of pixels, and the viewing angle of each row of pixels in the camera shooting direction is the same, i.e., the attenuation coefficients of the pixels in the row of the pixel N are all D (Φ)n) The attenuation coefficients of the pixels in the row of the pixel N-1 are all D (phi)n-1). The observation angle does not need to be measured one by one, and the observation angle of the current row of pixels can be obtained only by measuring one pixel or a plurality of pixels in the current row, so that the measurement time of the whole measurement process is saved.
And S104, performing brightness compensation according to the pixel brightness of each pixel at the bent part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bent part of the curved surface display panel in the camera shooting direction.
The brightness of each pixel at the bending part A in the normal direction is integrated with the brightness of each pixel at the non-bending part B in the normal direction shot by a camera, and the brightness is stored, so that the pixel brightness of the curved surface display panel obtained by the processor is the pixel brightness in the normal direction of the pixel, the pixel brightness data are accurate, and the brightness compensation is conveniently carried out according to the pixel brightness data.
The brightness compensation device for the curved display panel provided by the embodiment of the invention obtains the pixel brightness of each pixel on the whole curved display panel in the camera shooting direction by using the camera in the direction perpendicular to the plane of the non-curved part of the curved display panel, obtains the pixel brightness of each pixel on the curved part in the normal direction according to the attenuation coefficient of the pixel brightness along with the observation angle and the pixel brightness of each pixel on the curved part in the camera shooting direction, and then integrates the pixel brightness of each pixel on the curved part in the normal direction and the pixel brightness of each pixel on the non-curved part in the camera shooting direction to perform brightness compensation on the curved display panel. And when obtaining the attenuation coefficient of the pixel brightness along with the observation angle, selecting the pixel from a sampling position on the curved surface display panel to measure the pixel brightness and the observation angle. The brightness compensation scheme provided by the embodiment of the invention can integrate the pixel brightness in the normal direction of each pixel at the bending part and the pixel brightness in the normal direction of each pixel at the non-bending part, and then carry out brightness compensation according to the integrated pixel brightness, thereby avoiding the problem that the difference between the pixel brightness at the bending part and the pixel brightness at the non-bending part acquired in the shooting direction of a camera is larger, avoiding the phenomena of whole surface brightness deviation and the like after the brightness compensation of a curved surface display panel, and obtaining good Demura compensation effect.
In another embodiment of the present invention, a specific obtaining method of the attenuation coefficient of the pixel at the bend B is described in detail, referring to fig. 5, fig. 5 is a flowchart of another luminance compensation method for a curved display panel according to an embodiment of the present invention, where the luminance compensation method for a curved display panel includes:
s501, acquiring pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of a camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved display panel is located.
S502, obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle.
S503, determining attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
The attenuation coefficients of the pixel brightness of each pixel with the observation angle are approximately the same, and when the attenuation coefficient of the pixel brightness of the pixel at the sampling position with the observation angle is obtained, the attenuation coefficient of the pixel brightness of each pixel at the bending position with the observation angle is obtained.
For example, interpolation may be used to determine the attenuation coefficients corresponding to different viewing angles for each pixel at a bend of the curved display panel according to the attenuation coefficients of the pixel brightness at the sampling location of the curved display panel varying with the viewing angle. When the attenuation coefficient of each pixel at the bend is determined, the pixel brightness of each observation angle cannot be measured, the pixel brightness and the observation angles are measured to obtain a plurality of attenuation coefficients, a relation curve graph of the observation angles and the attenuation coefficients is drawn according to the attenuation coefficients, and the approximate attenuation coefficient of the observation angle without the pixel brightness measurement is obtained by adopting an interpolation method.
Specifically, determining the attenuation coefficients corresponding to different observation angles of each pixel at the bending position of the curved display panel according to the attenuation coefficients of the pixel brightness at the sampling position of the curved display panel 11 along with the observation angle may include: obtaining an attenuation coefficient-observation angle curve according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; and determining attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel according to the attenuation coefficient-observation angle curve.
Referring to fig. 6, fig. 6 is a graph of attenuation coefficient versus observation angle of a pixel at a sampling location according to an embodiment of the present invention, and it can be seen from the above example that a series of observation angles θ of the pixel at the sampling location is selected1、θ2……θn… …, obtaining the pixel brightness Lv corresponding to the observation angle1、Lv2……Lvn… …, obtaining attenuation coefficient D (theta) according to the corresponding relation between observation angle and pixel brightness1)、D(θ2)……D(θn) … … are provided. If the horizontal axis represents the observation angle theta and the vertical axis represents the attenuation coefficient D, a coordinate point (theta) is arranged on the coordinate system1，D(θ1))、(θ2，D(θ2))……(θn，D(θn) … …, and the above coordinate points are successively connected smoothly, resulting in the attenuation coefficient-observation angle curve shown in fig. 6.
Referring to fig. 6, if the viewing angle of the pixel N in the camera shooting direction at the bend is ΦnThe curve shown in FIG. 6 can be obtained with an observation angle of φnCorresponding attenuation coefficient D (phi)n). That is, the attenuation coefficient of the pixel N in the camera shooting direction is acquired using interpolation.
S504, determining the pixel brightness of each pixel at the bending position of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bending position of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bending position of the curved surface display panel corresponding to different observation angles.
And S505, performing brightness compensation according to the pixel brightness of each pixel at the bent part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bent part of the curved surface display panel in the camera shooting direction.
In the embodiment, the attenuation coefficient of the pixel brightness of each pixel at the bend in the camera shooting direction is obtained by drawing the attenuation coefficient-observation angle curve graph of the pixel and by an interpolation method, so that the pixel brightness of each pixel at the bend in the normal direction can be more conveniently obtained.
In another embodiment of the present invention, a process of compensating for pixel brightness of a pixel is described in detail, and referring to fig. 7, fig. 7 is a flowchart of another method for compensating brightness of a curved display panel according to an embodiment of the present invention, where the method for compensating brightness of a curved display panel includes:
s701, acquiring pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of the camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved display panel is located.
S702, obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle.
S703, determining attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
And S704, determining the pixel brightness of each pixel at the bend of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bend of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bend of the curved surface display panel corresponding to different observation angles.
S705, acquiring a pixel brightness reference value of the curved surface display panel according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction.
When the pixel luminance in the normal direction of each pixel at a non-bend and each pixel at a bend is obtained, the pixel luminance reference value may be obtained by averaging the pixel luminance in the normal direction of all the pixels or averaging the pixel luminance in the normal direction of some of the pixels, and is used as the reference value for adjusting the pixel luminance of each pixel in the normal direction, that is, the pixel luminance of each pixel in the normal direction needs to be adjusted to the pixel luminance reference value.
S706, obtaining the gray scale-brightness relation of each pixel of the curved surface display panel.
It should be noted that the gray scale values of the pixels on the curved display panel need to be loaded in the driving signals, and therefore, in order to ensure that the image can be normally displayed on the curved display panel, the pixel brightness values of the pixels need to be converted into the gray scale values.
And S707, determining a compensation gray-scale value corresponding to each gray scale of each pixel of the curved surface display panel according to the pixel brightness reference value of the curved surface display panel and the gray scale-brightness relation of each pixel of the curved surface display panel.
And S708, displaying according to the compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel.
According to the gray scale-brightness relation of each pixel of the curved surface display panel, when the pixel brightness in the normal direction of the pixel is a pixel brightness reference value, a corresponding compensation gray scale value is determined, the compensation gray scale value is used as an actual gray scale value of the pixel, and then a driving signal corresponding to the compensation gray scale value is input to the curved surface display panel, so that the curved surface display panel displays according to the compensation gray scale value.
It should be noted that, since the gray-scale values are digital data, directly detecting and compensating the gray-scale values of the pixels easily causes a large error in the compensation result, and considering that the pixel brightness values are analog data, the pixel brightness of each pixel in the normal direction is used for measurement and calculation, so that a better brightness compensation effect can be obtained.
The embodiment of the present invention further provides a brightness compensation device for a curved display panel, and referring to fig. 8, fig. 8 is a schematic structural diagram of the brightness compensation device for a curved display panel according to the embodiment of the present invention, where the brightness compensation device for a curved display panel includes:
a shooting brightness obtaining module 81, configured to obtain pixel brightness of each pixel on the entire curved display panel in the shooting direction of the camera; the shooting direction of the camera is perpendicular to the plane where the non-bending part of the curved surface display panel is located;
the attenuation coefficient acquisition module 82 is used for acquiring the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle;
the normal brightness obtaining module 83 is configured to determine the pixel brightness of each pixel at the bend of the curved display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling position of the curved display panel along with the observation angle and the pixel brightness of each pixel at the bend in the camera shooting direction;
and the brightness compensation module 84 is configured to perform brightness compensation according to the pixel brightness of each pixel at the curved portion of the curved display panel in the normal direction and the pixel brightness of each pixel at the non-curved portion of the curved display panel in the camera shooting direction.
The brightness compensation device for the curved display panel provided by the embodiment of the invention obtains the pixel brightness of each pixel on the whole curved display panel in the camera shooting direction by using the camera in the direction perpendicular to the plane of the non-curved part of the curved display panel, obtains the pixel brightness of each pixel on the curved part in the normal direction according to the attenuation coefficient of the pixel brightness along with the observation angle and the pixel brightness of each pixel on the curved part in the camera shooting direction, and then integrates the pixel brightness of each pixel on the curved part in the normal direction and the pixel brightness of each pixel on the non-curved part in the camera shooting direction to perform brightness compensation on the curved display panel. And when obtaining the attenuation coefficient of the pixel brightness along with the observation angle, selecting the pixel from a sampling position on the curved surface display panel to measure the pixel brightness and the observation angle. The brightness compensation scheme provided by the embodiment of the invention can integrate the pixel brightness in the normal direction of each pixel at the bending part and the pixel brightness in the normal direction of each pixel at the non-bending part, and then carry out brightness compensation according to the integrated pixel brightness, thereby avoiding the problem that the difference between the pixel brightness at the bending part and the pixel brightness at the non-bending part acquired in the shooting direction of a camera is larger, avoiding the phenomena of whole surface brightness deviation and the like after the brightness compensation of a curved surface display panel, and obtaining good Demura compensation effect.
On the basis of the above embodiment, the sampling position of the curved display panel may be the central position of the non-bending position of the curved display panel; the attenuation coefficient obtaining module may include: the brightness acquisition unit is used for acquiring the pixel brightness of the pixel at the central position of the non-bending part of the curved surface display panel at different observation angles; the attenuation coefficient acquisition unit is used for determining the attenuation coefficient of the pixel brightness of the sampling position of the curved surface display panel along with the observation angle according to the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at different observation angles and the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at the observation angle of 0 degrees; the observation angle is an included angle between the pixel brightness obtaining direction and the normal direction of the pixel.
Optionally, the normal brightness obtaining module may include: the attenuation coefficient determining unit is used for determining attenuation coefficients corresponding to pixels at the bent part of the curved surface display panel at different observation angles according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles; and the normal brightness acquisition unit is used for determining the pixel brightness of each pixel at the bend of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bend of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bend of the curved surface display panel corresponding to different observation angles.
Optionally, the attenuation coefficient determining unit may include: the attenuation curve acquiring subunit is used for acquiring an attenuation coefficient-observation angle curve according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; and the attenuation coefficient determining subunit is used for determining the attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel according to the attenuation coefficient-observation angle curve.
Optionally, the attenuation coefficient determining unit may be specifically configured to: and determining the attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel by adopting an interpolation method according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
Optionally, the brightness compensation module may include: a reference value obtaining unit, configured to obtain a pixel brightness reference value of the curved display panel according to pixel brightness of each pixel at a bend of the curved display panel in a normal direction and pixel brightness of each pixel at a non-bend of the curved display panel in a camera shooting direction; the gray scale obtaining unit is used for obtaining the gray scale-brightness relation of each pixel of the curved surface display panel; the compensation gray scale obtaining unit is used for determining a compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel according to the pixel brightness reference value of the curved surface display panel and the gray scale-brightness relation of each pixel of the curved surface display panel; and the display unit is used for displaying according to the compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A method for compensating brightness of a curved display panel, comprising:
acquiring pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of the camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved surface display panel is located;
obtaining the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; acquiring an included angle between a camera shooting direction and a normal of each pixel at a sampling position of the curved surface display panel, namely an observation angle;
determining the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling part of the curved surface display panel along with the observation angle and the pixel brightness of each pixel at the bending part in the camera shooting direction;
and performing brightness compensation according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction.
2. The method of claim 1, wherein the sampling location of the curved display panel is a center position of a non-curve location of the curved display panel;
the obtaining of the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle includes:
acquiring the pixel brightness of the pixel at the central position of the non-bending part of the curved surface display panel at different observation angles;
determining the attenuation coefficient of the pixel brightness of the sampling position of the curved surface display panel along with the observation angle according to the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at different observation angles and the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at the observation angle of 0 degree;
the observation angle is an included angle between a pixel brightness obtaining direction and a normal direction of the pixel.
3. The method of claim 2, wherein determining the pixel brightness of each pixel at the bend of the curved display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sample of the curved display panel with the observation angle and the pixel brightness of each pixel at the bend in the camera shooting direction comprises:
determining attenuation coefficients corresponding to the pixels at the bent part of the curved surface display panel at different observation angles according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles;
and determining the pixel brightness of each pixel at the bent part of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bent part of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bent part of the curved surface display panel corresponding to different observation angles.
4. The method of claim 3, wherein determining the attenuation coefficients corresponding to different viewing angles for each pixel at a curve of the curved display panel according to the attenuation coefficients of the pixel brightness at the sampling location of the curved display panel with the viewing angle comprises:
obtaining an attenuation coefficient-observation angle curve according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle;
and determining attenuation coefficients corresponding to different observation angles of each pixel at the bending part of the curved surface display panel according to the attenuation coefficient-observation angle curve.
5. The method of claim 3, wherein determining the attenuation coefficients corresponding to different viewing angles for each pixel at a curve of the curved display panel according to the attenuation coefficients of the pixel brightness at the sampling location of the curved display panel with the viewing angle comprises:
and determining attenuation coefficients corresponding to different observation angles of each pixel at the bent part of the curved surface display panel by adopting an interpolation method according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
6. The method of claim 1, wherein the performing the brightness compensation according to the pixel brightness of each pixel at the curve of the curved display panel in the normal direction and the pixel brightness of each pixel at the non-curve of the curved display panel in the camera shooting direction comprises:
acquiring a pixel brightness reference value of the curved surface display panel according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction;
acquiring a gray scale-brightness relation of each pixel of the curved surface display panel;
determining a compensation gray-scale value corresponding to each gray scale of each pixel of the curved surface display panel according to the pixel brightness reference value of the curved surface display panel and the gray scale-brightness relation of each pixel of the curved surface display panel;
and displaying according to the compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel.
7. A curved-surface display panel luminance compensation apparatus, comprising:
the shooting brightness acquisition module is used for acquiring the pixel brightness of each pixel on the whole curved surface display panel in the shooting direction of the camera; the shooting direction of the camera is a direction perpendicular to a plane where a non-bending part of the curved surface display panel is located;
the attenuation coefficient acquisition module is used for acquiring the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle; acquiring an included angle between a camera shooting direction and a normal of each pixel at a sampling position of the curved surface display panel, namely an observation angle;
the normal brightness acquisition module is used for determining the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction according to the attenuation coefficient of the pixel brightness at the sampling part of the curved surface display panel along with the observation angle and the pixel brightness of each pixel at the bending part in the camera shooting direction;
and the brightness compensation module is used for performing brightness compensation according to the pixel brightness of each pixel at the bending part of the curved surface display panel in the normal direction and the pixel brightness of each pixel at the non-bending part of the curved surface display panel in the camera shooting direction.
8. The apparatus of claim 7, wherein the sampling location of the curved display panel is a center position of a non-curved portion of the curved display panel;
the attenuation coefficient acquisition module includes:
the brightness acquisition unit is used for acquiring the pixel brightness of the pixel at the central position of the non-bending part of the curved surface display panel at different observation angles;
the attenuation coefficient acquisition unit is used for determining the attenuation coefficient of the pixel brightness of the sampling position of the curved surface display panel along with the observation angle according to the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at different observation angles and the pixel brightness of the central position pixel of the non-bending part of the curved surface display panel at the observation angle of 0 degree; the observation angle is an included angle between a pixel brightness obtaining direction and a normal direction of the pixel.
9. The apparatus of claim 7, wherein the normal brightness obtaining module comprises:
the attenuation coefficient determining unit is used for determining attenuation coefficients corresponding to pixels at the bent part of the curved surface display panel at different observation angles according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles;
and the normal brightness acquisition unit is used for determining the pixel brightness of each pixel at the bent part of the curved surface display panel in the normal direction according to the pixel brightness of each pixel at the bent part of the curved surface display panel in the camera shooting direction and the attenuation coefficients of each pixel at the bent part of the curved surface display panel corresponding to different observation angles.
10. The apparatus of claim 9, wherein the attenuation factor determining unit comprises:
the attenuation curve acquiring subunit is used for acquiring an attenuation coefficient-observation angle curve according to the attenuation coefficient of the pixel brightness at the sampling position of the curved surface display panel along with the observation angle;
and the attenuation coefficient determining subunit is used for determining the attenuation coefficients corresponding to the different observation angles of the pixels at the bending part of the curved surface display panel according to the attenuation coefficient-observation angle curve.
11. The apparatus of claim 9, wherein the attenuation factor determining unit is specifically configured to:
and determining attenuation coefficients corresponding to different observation angles of each pixel at the bent part of the curved surface display panel by adopting an interpolation method according to the attenuation coefficients of the pixel brightness at the sampling part of the curved surface display panel along with the observation angles.
12. The apparatus of claim 7, wherein the brightness compensation module comprises:
a reference value obtaining unit, configured to obtain a pixel brightness reference value of the curved surface display panel according to pixel brightness of each pixel at a bend of the curved surface display panel in a normal direction and pixel brightness of each pixel at a non-bend of the curved surface display panel in a camera shooting direction;
the gray scale obtaining unit is used for obtaining the gray scale-brightness relation of each pixel of the curved surface display panel;
the compensation gray scale obtaining unit is used for determining a compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel according to the pixel brightness reference value of the curved surface display panel and the gray scale-brightness relation of each pixel of the curved surface display panel;
and the display unit is used for displaying according to the compensation gray scale value corresponding to each gray scale of each pixel of the curved surface display panel.
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| CN111665021B (en) * | 2020-06-04 | 2022-07-19 | 昆山国显光电有限公司 | Method and device for testing brightness uniformity of display panel |
| CN111754906B (en) * | 2020-06-30 | 2022-09-27 | 上海天马微电子有限公司 | Method for detecting brightness uniformity of curved surface display screen |
| CN112259035B (en) * | 2020-10-30 | 2023-11-14 | 天马微电子股份有限公司 | Display control method, flexible display panel and display device |
| CN112634827B (en) * | 2021-01-27 | 2021-11-30 | 季华实验室 | Single-box correction plane tilt correction method and device, electronic equipment and storage medium |
| CN112985767B (en) * | 2021-02-06 | 2022-01-25 | 深圳精智达技术股份有限公司 | Method and related device for shooting pixel brightness of display panel |
| CN113707088B (en) * | 2021-08-26 | 2022-12-23 | 京东方科技集团股份有限公司 | Brightness compensation method and device and display device |
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