CN112511761A

CN112511761A - Curved screen display compensation method, device, equipment, storage medium and shooting equipment

Info

Publication number: CN112511761A
Application number: CN202011319552.0A
Authority: CN
Inventors: 李志林
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-03-16
Anticipated expiration: 2040-11-23
Also published as: CN112511761B

Abstract

The application discloses a curved surface screen display compensation method, a curved surface screen display compensation device, a curved surface screen display compensation equipment, a storage medium and shooting equipment, wherein the method comprises the following steps: when the curved screen is in a bright screen state, controlling a shooting device to carry out planar shooting on the curved screen to obtain a detection image of the curved screen; detecting the detection image based on a preset mura detection strategy, and determining abnormal pixels displaying abnormity in the curved screen; determining compensation data of the abnormal pixel based on a preset compensation elimination mura strategy; and compensating the abnormal pixel by using the compensation data of the abnormal pixel. Like this, through carrying out the planarization to the curved surface screen and shoot, can accurately detect the regional demonstration condition of curved surface in the curved surface screen to improve the accuracy that follow-up mura detected, and the accuracy of demura (compensation elimination mura), guarantee the display effect of curved surface screen.

Description

Curved screen display compensation method, device, equipment, storage medium and shooting equipment

Technical Field

The present disclosure relates to display technologies, and in particular, to a curved-surface screen display compensation method, apparatus, device, storage medium, and shooting device.

Background

In the display screen production and manufacturing process, for example: organic Light-Emitting diodes (OLEDs), Mini LEDs or uuleds, etc. have a phenomenon of uneven display brightness of a produced display screen due to the influence of many factors, such as a production process, used materials, and an environment, and are called mura defects. In actual production, manufacturers can perform display compensation according to parameters such as the characteristic size, the area, the brightness difference and the like of mura. However, the existing demura (compensation elimination mura) method is designed for a flat display screen, and when the demura is performed on a curved screen, a curved surface area at the edge of the curved screen adopts an approximate plane correction method, so that the correction effect of the curved surface area is poor.

Disclosure of Invention

In order to solve the above technical problem, embodiments of the present application desirably provide a curved surface screen display compensation method, apparatus, device, storage medium, and shooting device.

The technical scheme of the application is realized as follows:

in a first aspect, a curved screen display compensation method is provided, the method comprising:

when the curved screen is in a bright screen state, controlling a shooting device to carry out planar shooting on the curved screen to obtain a detection image of the curved screen;

detecting the detection image based on a preset mura detection strategy, and determining abnormal pixels displaying abnormity in the curved screen;

determining compensation data of the abnormal pixel based on a preset compensation elimination mura strategy;

and compensating the abnormal pixel by using the compensation data of the abnormal pixel.

In a second aspect, a curved-surface screen display compensation device is provided, the device comprising:

the control unit is used for controlling the shooting equipment to carry out planar shooting on the curved screen when the curved screen is in a bright screen state so as to obtain a detection image of the curved screen;

the detection unit is used for detecting the detection image based on a preset mura detection strategy and determining abnormal pixels which are displayed abnormally in the curved screen; determining compensation data of the abnormal pixel based on a preset compensation elimination mura strategy;

and the compensation unit is used for compensating the abnormal pixel by using the compensation data of the abnormal pixel.

In a third aspect, there is provided a curved screen display compensation apparatus, the apparatus comprising: a processor and a memory configured to store a computer program capable of running on the processor,

wherein the processor is configured to perform the steps of the method of the first aspect when executing the computer program.

In a fourth aspect, a computer storage medium is provided, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method of the first aspect.

In a fifth aspect, there is provided a photographing apparatus including: the device comprises a camera, a positioning device and a driving device; wherein the content of the first and second substances,

the driving device is used for driving the camera to move and rotate;

the positioning device is used for detecting whether the normal of the camera is aligned with the normal of the curved screen;

the camera is used for shooting the curved screen when the curved screen is in a bright screen state to obtain a detection image of the curved screen; the detection image is used for determining compensation data of the abnormal pixel so as to compensate the abnormal pixel through the compensation data of the abnormal pixel.

The embodiment of the application provides a curved surface screen display compensation method, a curved surface screen display compensation device, a curved surface screen display compensation equipment, a storage medium and a shooting equipment, wherein the method comprises the following steps: when the curved screen is in a bright screen state, controlling a shooting device to carry out planar shooting on the curved screen to obtain a detection image of the curved screen; detecting the detection image based on a preset mura detection strategy, and determining abnormal pixels displaying abnormity in the curved screen; determining compensation data of the abnormal pixel based on a preset compensation elimination mura strategy; and compensating the abnormal pixel by using the compensation data of the abnormal pixel. Like this, through carrying out the planarization to the curved surface screen and shoot, can accurately detect the regional demonstration condition of curved surface in the curved surface screen to improve the accuracy that follow-up mura detected, and the accuracy of demura (compensation elimination mura), guarantee the display effect of curved surface screen.

Drawings

FIG. 1 is a first flowchart of a curved-screen display compensation method according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a first composition structure of a shooting device in an embodiment of the present application;

FIG. 3 is a schematic diagram of a second composition structure of the photographing apparatus in the embodiment of the present application;

FIG. 4 is a schematic view of a positioning principle of the positioning device in the embodiment of the present application;

FIG. 5 is a second flowchart of a compensation method for curved-screen display according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a first division structure of a display area of a curved screen in an embodiment of the present application;

FIG. 7 is a diagram illustrating a second division structure of a display area of a curved screen according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a pixel array of a curved panel according to an embodiment of the present application;

FIG. 9 is a schematic longitudinal cross-sectional view of the curved screen of FIG. 7;

FIG. 10 is a schematic perspective view of a display screen;

FIG. 11 is a schematic view of mura stripes in a display screen;

FIG. 12 is a flowchart illustrating a display compensation method for a main screen display area according to an embodiment of the present disclosure;

FIG. 13 is a flowchart illustrating a method for compensating a display of an off-screen display area according to an embodiment of the present application

FIG. 14 is a schematic diagram of a structure of a curved panel display compensation device according to an embodiment of the present application;

FIG. 15 is a schematic diagram of the structure of a curved panel display compensation device according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a basic principle of a photographing apparatus in an embodiment of the present application.

Detailed Description

So that the manner in which the features and elements of the present embodiments can be understood in detail, a more particular description of the embodiments, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.

The curved screen detected by the embodiment of the application comprises at least one display area, and when the curved screen comprises at least two display areas, part of the display areas only comprise a plane area or a curved display area, and part of the display areas comprise both the plane area and the curved area.

Here, when the curved screen includes at least two display areas, the pixel structures and optical characteristics of different display areas are different, and therefore, different display areas should use different mura detection strategies to perform mura stripe detection, and similarly, different compensation elimination mura strategies (also referred to as demura strategies) should be used to perform mura stripe compensation.

Fig. 1 is a first flowchart of a curved-screen display compensation method in an embodiment of the present application, and as shown in fig. 1, the method may specifically include:

step 101: when the curved screen is in a bright screen state, controlling a shooting device to carry out planar shooting on the curved screen to obtain a detection image of the curved screen;

in some embodiments, the photographing apparatus includes: the device comprises a camera, a positioning device and a driving device, wherein the driving device is used for driving the camera to move and rotate, and the positioning device is used for detecting whether the normal of the camera is aligned with the normal of the curved screen;

correspondingly, the controlling and shooting device carries out planar shooting on the curved screen to obtain a detection image of the curved screen, and the method comprises the following steps: controlling the driving device to drive the camera to move and rotate, and when the positioning device detects that the normal of the camera is aligned with the normal of the target shooting area, controlling the camera to shoot the target shooting area to obtain a detection sub-image corresponding to the target shooting area; the target shooting area is an area perpendicular to the normal of the camera in the curved screen.

Specifically, the driving device drives the camera to move and rotate, so that the camera has 6 degrees of freedom, namely, the degree of freedom of movement along the directions of three orthogonal coordinate axes of x, y and z and the degree of freedom of rotation around the three coordinate axes.

In some embodiments, the drive device comprises a fixed bracket, a connecting piece and a rotating piece; wherein the fixed bracket comprises a moving track; the first end of the connecting piece is connected to the moving track of the fixed bracket through the first rotating piece and moves in a first direction and a second direction along the moving track; the connecting piece is a telescopic connecting piece and can be telescopic along a third direction; the first rotating member can rotate the connecting member about the first direction and the second direction; the second rotating member can rotate the camera around the third direction.

In some embodiments, the moving rail on the fixed bracket is a circular arc rail, and the bending direction of the circular arc rail is consistent with the bending direction of the curved screen.

It should be noted that, the connecting piece moves in the circular arc-shaped track, and the moving track is consistent with the curved track of the curved screen, which is more convenient for aligning the normal line of the camera with the normal line of the curved screen.

Fig. 2 is a schematic diagram of a first component structure of a shooting device in an embodiment of the present application, and as shown in fig. 2, the shooting device includes a camera 21, a positioning device (not shown in fig. 2), and a driving device 22, an electronic device 23 including a curved screen is fixed on a fixing device 24, the driving device 22 includes a fixing bracket, a connecting member, a first rotating member, and a second rotating member, two ends of the connecting member are respectively connected to the fixing bracket and the camera through the first rotating member and the second rotating member, the fixing bracket includes a moving track, the connecting member moves in a first direction and a second direction along the moving track, and the connecting member is a telescopic connecting member capable of being extended and retracted in a third direction; the first rotating piece can enable the connecting piece to rotate around a first direction and a second direction; the second rotating piece can enable the camera to rotate around the third direction, the fixed support is an arc-shaped support, and the bending direction of the arc-shaped support is consistent with that of the curved screen.

It should be noted that, when the fixed bracket is an arc-shaped bracket, the moving track arranged on the fixed bracket naturally matches with the shape of the fixed bracket, and when the fixed bracket is a non-arc-shaped bracket, such as a flat plate-shaped bracket, the moving track can be only arranged as an arc-shaped track.

It should be noted that the first direction, the second direction and the third direction are three axial directions of XYZ axes, and in practical applications, the positioning device may only include one rotating member, and the rotating member may be a spherical rotating shaft, so that the camera has rotational degrees of freedom in three directions.

In some embodiments, the drive device comprises a stationary bracket, a first connector, a second connector, a third connector, a first rotating member, a second rotating member, and a third rotating member; wherein the fixed bracket comprises a moving track; the first end of the first connecting piece is connected to the moving track of the fixed bracket through the first rotating piece and moves in a first direction and a second direction along the moving track; the second end of the first connecting piece is connected with the first end of the second connecting piece through the second rotating piece, the second end of the second connecting piece is connected with the first end of the third connecting piece through the third rotating piece, and the second end of the third connecting point is fixedly provided with the camera; at least one of the first connecting piece, the second connecting piece and the third connecting piece is a telescopic connecting piece which can be telescopic along a third direction; the first rotating piece can enable the first connecting piece to rotate around the first direction, the second rotating piece can enable the second connecting piece to rotate around the second direction, and the third rotating piece can enable the third connecting piece to rotate around the third direction.

Fig. 3 is a schematic diagram of a second component structure of the shooting device in the embodiment of the present application, and as shown in fig. 3, the shooting device includes a camera 31, a positioning device (not shown in fig. 3), and a driving device 32, an electronic device 33 including a curved screen is fixed on a fixing device 34, the driving device 32 includes a fixed bracket, three connecting members, and three rotating members, and the fixed bracket includes a moving track; the first end of the first connecting piece is connected to the moving track of the fixed bracket through the first rotating piece and moves in a first direction and a second direction along the moving track; the second end of the first connecting piece is connected with the first end of the second connecting piece through a second rotating piece, the second end of the second connecting piece is connected with the first end of the third connecting piece through a third rotating piece, and the second end of the third connecting point is fixedly provided with a camera; at least one of the first connecting piece, the second connecting piece and the third connecting piece is a telescopic connecting piece and can be telescopic along a third direction; the first rotating piece can enable the first connecting piece to rotate around the first direction, the second rotating piece can enable the second connecting piece to rotate around the second direction, the third rotating piece can enable the third connecting piece to rotate around the third direction, the fixed support is an arc-shaped support, and the bending direction of the arc-shaped support is consistent with that of the curved screen.

It should be noted that the circular arc-shaped bracket may be the bracket including the flat plate portion and the curved portion as shown in fig. 2, and thus the circular arc-shaped bracket may be set in a fixed state, or may only include the curved portion as shown in fig. 3, and the circular arc-shaped bracket may also be set in a movable state.

It should be noted that, although the driving device can drive the camera to move and rotate, the relative position between the camera and the curved screen cannot be identified. Therefore, a laser positioning device is additionally arranged on the camera or the tail end of the driving device, and the laser positioning can adopt a parallel laser positioning mode.

In some embodiments, the positioning device includes a laser emitting end and a laser receiving end, the laser emitting end emits parallel laser to the curved screen along a normal direction of the camera, and the laser receiving end receives the laser reflected by the curved screen.

It should be noted that the alignment of the normal direction can ensure that the laser emitted from the positioning device is reflected vertically, and if the alignment is not performed, the light will be deflected.

Fig. 4 is a schematic diagram of a positioning principle of a positioning device in an embodiment of the present application, as shown in fig. 4, the positioning device may be disposed on a camera 41, and it is ensured that emitted laser of the positioning device is parallel to a direction of appearance of the camera, when the emitted laser reaches a curved screen 42, if a normal of the camera is aligned with a normal of a facing curved surface, the emitted laser is vertically reflected by the curved surface, the reflected laser is also parallel to the normal of the camera, and is detected by the positioning device, the camera 41 indicated by a solid line in fig. 4, if the normal of the camera is not aligned with the normal of the facing curved surface, the emitted laser is reflected by the curved surface to other directions, and the camera 41 indicated by a dashed solid line in fig. 4, the emitted laser of the dashed line and the reflected laser of the dashed line are different in directions, and the positioning device cannot.

Step 102: detecting the detection image based on a preset mura detection strategy, and determining abnormal pixels displaying abnormity in the curved screen;

as shown in fig. 11, which shows mura stripes actually appearing in the project, it can be seen from fig. 11 that vertical mura stripes are obviously present in the under-screen display area, and a certain color cast phenomenon is also present.

Specifically, the brightness value of each pixel is obtained from the detection image, and when the brightness value of the pixel meets the brightness standard, the pixel is a normal pixel; if the brightness standard is not satisfied, the pixel is an abnormal pixel.

Here, the luminance standard is a detection standard for an abnormal pixel and is also a correction standard for an abnormal pixel. The brightness criterion may be a fixed brightness value, or a range of brightness values. For example, when the brightness standard is a fixed brightness value, the brightness value may be an average value, a regression value, or an industry standard value of the brightness of the pixels of the curved panel.

It should be noted that the photographing device is a high-precision CCD camera conventionally used by demura, and mainly acquires gray data to obtain brightness without acquiring RGB color images. That is to say, the brightness of the pixels is acquired by shooting the screen by controlling the three pixels of RGB to be respectively lightened in a time-sharing manner.

Step 103: determining compensation data of the abnormal pixel based on a preset compensation elimination mura strategy;

and determining the difference value of the brightness value of the abnormal pixel and the brightness standard, and taking the difference value as compensation data of the abnormal pixel.

It should be noted that some panel factories only compensate brightness difference and not color difference, such a luminence Demura generally only needs to detect gray scale images, and because the Mura presented in different gray scales is different, high, medium and low gray scales are generally detected, and finally, the data of Demura is averaged, and of course, different panel factories are specifically set to select according to their actual requirements.

Illustratively, the brightness of each pixel in 32 gray scale should be 60 nits, and if the brightness of some pixels is found to be not 60 nits in demura, the difference between the actual brightness value and 60 nits is the compensation value of the pixel, the compensation value is stored in the storage unit of the pixel control unit, and the brightness of the pixel is controlled to be 60 nits by the pixel control circuit when the pixel actually emits light.

Step 104: and compensating the abnormal pixel by using the compensation data of the abnormal pixel.

Specifically, the compensation data of the abnormal pixel is stored in a flash memory cell of a Flexible Printed Circuit (FPC); controlling a display driving chip to load compensation data from the flash memory unit; and controlling the display driving chip to compensate the original data by using the compensation data of the abnormal pixel and then outputting the compensated data.

That is, the Display Driver IC (DDIC) loads the compensation data to the flash memory, generates the compensation data and stores the compensation data, and the DDIC extracts the compensation data from the flash memory to Display the compensation data together each time the curved panel is lit, thereby realizing mura-free Display.

By adopting the technical scheme, the display condition of the curved surface area in the curved surface screen can be accurately detected by performing planar shooting on the curved surface screen, so that the accuracy of subsequent mura detection is improved, the accuracy of demura (compensation elimination mura) is improved, and the display effect of the curved surface screen is ensured.

In order to realize comprehensive screen display of the electronic equipment, the under-screen camera shooting technology is developed, and the under-screen camera shooting technology camera is arranged below the screen of the mobile terminal. In a photographing scene, light rays can transmit through a camera area at the top end of the full-face screen and then enter a camera to form an image on the image sensor, and photographing is achieved. The camera area in the full screen display scene can be used as a part of the display screen to carry out normal display, and the full screen display effect is realized. The camera shooting technology under the screen can display and shoot a common screen camera area, and a user can not see the camera under the screen through the screen under any condition, so that the full-screen display of electronic products such as mobile phones is realized.

When the under-screen camera shooting technology is applied, a display panel of a camera area is made into low pixel density (Pixels Per inc, PPI) display, or pixel arrangement is changed to increase gaps, so that the light transmittance is increased.

Fig. 5 is a second flowchart of the curved-screen display compensation method in the embodiment of the present application, and as shown in fig. 5, the method may specifically include:

step 501: when the curved screen is in a bright screen state, controlling a shooting device to carry out planar shooting on the curved screen to obtain a first detection sub-image corresponding to a planar area and a second detection sub-image corresponding to a curved area;

step 502: determining brightness information of a first display area and brightness information of a second display area in the curved screen from the first detection sub-image and the second detection sub-image;

it should be noted that, when the curved screen includes at least two display areas, the pixel structures and optical characteristics of different display areas are different, and therefore, different display areas should use different mura detection strategies to perform mura stripe detection, and similarly, different compensation and elimination mura strategies (also referred to as demura strategies) should be used to perform mura stripe compensation.

Fig. 6 is a schematic view of a first dividing structure of a display area of a curved screen in an embodiment of the present application, and as shown in fig. 6, the display panel includes a lower display area 61 and a main display area 62, a camera is disposed below the lower display area 61, and a pixel density of the lower display area 61 may be smaller than a pixel density of the main display area 62, or the lower display area 61 adopts a transparent electrode to increase light transmittance.

Fig. 7 is a schematic diagram of a second dividing structure of a display area of a curved screen in the embodiment of the present application, and as shown in fig. 7, the display panel includes a lower screen display area 71, a transition display area 72, and a main screen display area 73, and physical pixel densities in the lower screen display area 71, the transition display area 72, and the main screen display area 73 may be sequentially increased.

For example, the third pixel density of the main screen display region 73 is 400ppi, the second pixel density of the transitional display region 72 is 200ppi, and the first pixel density of the under-screen display region 71 is 100 ppi.

Fig. 8 is a schematic structural diagram of a curved-screen pixel array in the embodiment of the present application, and as shown in fig. 8, a main screen display area 73 in the diagram is a normal display screen area, pixels are arranged according to a conventional method, including but not limited to a standard RGB/Delta arrangement/Pentile arrangement, and a pixel density is 400 ppi. The off-screen display area 71 in the figure is a transparent display area and is arranged in the same physical pixel arrangement as the transitional display area 72, which may be the same as the main-screen display area 73, but the size of the pixels is increased to 200ppi physical pixel density. The off-screen display area 71 reduces 3/4 driving circuit wiring in a mode of connecting 4 physical pixels in a rectangular partition area in parallel, display blocks after parallel connection are similar to those shown by grey transparent grids in the figure, metal wiring of the driving circuit can be greatly reduced in a mode of connecting multiple pixel blocks in parallel, transparency is increased, diffraction effect is reduced, and the display pixel density of the main-screen display area 73 after parallel connection is 100 ppi. The drive circuit of the main screen display area 73 is connected to the transitional display area 72 by a wiring, and is disposed under the pixels of the transitional display area 72.

The pixel arrangement of the transitional display area 72 is identical to that of the main screen display area 73, but the granularity of the pixels is increased by two times, ppi is reduced by half, and the pixel driving circuits of the transitional display area 72 are reduced by half, so that half of the space is left for the arrangement of the driving circuits of the under-screen display area 71.

The OLED pixels and the driving circuit of the under-screen display area 71, the transitional display area 72 and the main-screen display area 73 are arranged according to the method, and the driving circuit is connected to the display Drive IC, so that the technical scheme of full-screen display is realized.

The sub-pixels of the under-screen display area 71 in the figure use transparent electrodes including but not limited to ITO material, and the shape of the pixels of the under-screen display area 71 includes but not limited to rounded rectangles, ovals, circles, and for filling the transition areas of high and low pixels. The pixel driving circuit of the under-screen display area 71 includes, but is not limited to, 7T1C/5T1C/2T 1C.

In practical applications, the display screen of each display area may be an Organic Light-Emitting Diode (OLED). For example, an Active-matrix organic light emitting diode (AMOLED) or a Passive-matrix organic light emitting diode (PMOLED) may be used.

Fig. 9 is a schematic longitudinal sectional view of the curved panel shown in fig. 7, in which, as shown in fig. 9, a lower panel camera is disposed below a lower panel display region, driving circuits for a lower panel display region and a transitional display region are disposed below a transitional display region, and a driving circuit for a main panel region is disposed below a main panel display region. Other stacked layers, such as a glass cover plate, are included over the display area.

It should be noted that the driving circuit of the under-screen display area is arranged below the transition display area to increase the light transmittance of the under-screen display area so as to ensure the image capturing effect of the camera, and the driving circuit of the under-screen display area may also be arranged below the under-screen display area.

In practical applications, if the off-screen display area has no extra space to arrange the pixel driving circuits, the transition area may be increased to arrange the pixel driving circuits. In addition, the transition area also has the effect of display transition, when the pixel density of the transparent display area is lower and the pixel density of the main screen display area is higher, an obvious display boundary exists at the junction of the transparent display area and the main screen display area, and the overall screen display effect is poor. By increasing the transition area, the display effect is gradually transited from the non-transparent display area to the transparent display area, so that an obvious boundary between the non-transparent display area and the transparent display area is avoided, and the display quality is improved.

In practical applications, the pixel driving circuits of the display panel are opaque. As shown in fig. 10, the pixel anode of the conventional display panel is opaque (black dots in fig. 10), such a design would result in an optical periodic grating structure, and the pixel structure of the under-screen display area is different from the pixel structure of the main-screen display area, and there is no TFT structure under the under-screen display area, so the optical characteristics of the screen display are also different. Such a screen design is highly likely to cause mura stripes, and actually, the mura stripes shown in fig. 11 are also appeared, which affects the overall display effect of the display screen.

In practical applications, the light transmittance is lower as the first pixel density in the under-screen display area is higher, and therefore, the first pixel density and the number of the first pixel driving circuits can be reduced by increasing the size of the first pixel, so that the transmittance is increased.

Step 503: detecting the first display area based on a first mura detection strategy, and determining a first abnormal pixel of the first display area; detecting the second display area based on a second mura detection strategy, and determining second abnormal pixels of the second display area;

in some embodiments, the first mura detection strategy includes that a first pixel brightness value in the first display area satisfies a first brightness criterion, and the first pixel is a normal pixel; if the first brightness standard is not met, the first pixel is an abnormal pixel; the second mura detection strategy comprises that the brightness value of a second pixel in the first display area meets a second brightness standard, and the second pixel is a normal pixel; and if the second brightness standard is not met, the second pixel is an abnormal pixel.

In some embodiments, the first display area is a display area under a screen where the camera is located, and the second display area is a main screen display area.

Different display areas should employ different mura detection strategies for mura streak detection.

Step 504: determining compensation data of abnormal pixels in the first display area based on a first compensation elimination mura strategy; determining compensation data of abnormal pixels in the second display area based on a second compensation elimination mura strategy;

similarly, different display areas should be compensated for mura fringes using different demura strategies.

Step 505: compensating the abnormal pixel by using the compensation data of the abnormal pixel;

specifically, the compensation data of the abnormal pixel is stored in a flash memory unit of a flexible circuit board; controlling a display driving chip to load compensation data from the flash memory unit; and controlling the display driving chip to compensate the original data by using the compensation data of the abnormal pixel and then outputting the compensated data.

The embodiment of the application also specifically provides a display compensation method for the display area of the main screen and a display compensation method for the display area under the screen.

Fig. 12 is a schematic flowchart of a display compensation method for a main screen display area in an embodiment of the present application, and as shown in fig. 12, the method specifically includes:

step 1201: lightening the curved screen;

step 1202: CCD contraposition focusing;

step 1203: CCD collects RGB independent image data of the curved screen;

step 1204: the PC analyzes the collected image data;

step 1205: generating compensation data by a PC (personal computer) end algorithm;

step 1206: burning the compressed compensation data to a flash on the FPC;

step 1207: DDIC loads compensation data;

step 1208: the DDIC decompresses the data;

step 1209: DDIC application compensation data;

step 1210: and (5) normally displaying by using the curved screen.

After the curved screen is lightened, the independent RGB images are collected through demura equipment, the collected data are compared by the PC, the data are transmitted to the DDIC, the DDIC loads the compensation data to the Flash, the compensation data are generated and then stored, and when the curved screen is lightened each time, the DDIC extracts the compensation data from the Flash and displays the compensation data together, so that mura-free display can be realized.

But conventional demura as above is not sufficient to achieve full correction for the under-screen display area. For the display area under the screen, because the single-pixel brightness is different from the display area of the main screen, an independent demura process needs to be performed on the display area under the screen, and the specific process is shown in fig. 13 and includes:

step 1301: lightening the curved screen, and collecting the brightness values of pixels with high, medium and low gray scales;

step 1302: analyzing the original data to obtain the standard brightness values of the pixels with different gray scales;

step 1303: determining a difference between the measured luminance value and the standard luminance value for each pixel;

step 1304: the difference value is used as compensation data of the pixel under the current gray scale;

step 1305: similarly, obtaining compensation data of other gray scales;

step 1306: storing the compensation data to a flash;

step 1307: DDIC loads compensation data;

step 1308: fitting the compensation value of each pixel of 0-255 gray scales through a correction algorithm;

step 1309: calculating the original gray-scale value and the compensation value of each pixel;

step 1310: obtaining new gray-scale values of all pixels;

step 1311: and displaying the picture by using the new gray-scale value as output data.

Therefore, in the process of demura for the off-screen display area, separate demura operation needs to be performed on the off-screen display area. The specific execution steps are as follows:

1. when the demura is carried out on the main screen display area, the main screen display area (namely a second display area) is separated from the acquired image, and the independent processing is carried out according to the pixel brightness information of the main screen display area and the mura detection flow and the demura flow of the main screen display area.

2. And after the main screen display area is removed, performing independent processing according to the mura detection flow and the demura flow of the screen lower display area according to the pixel brightness information of the screen lower display area.

3. For the problems of color cast, interference and the like additionally existing in the area under the screen, a special correction algorithm needs to be loaded at a DDIC end, so that the two problems are further independently corrected;

4. after the correction of the two areas is finished, uniform brightness matching is carried out, and the brightness difference of the two display areas is eliminated;

it should be noted that, after the step 3, matching should be achieved, however, the matching results in different environments may only match the current environment well, because the main screen and the auxiliary screen are corrected separately, it is difficult to avoid the total deviation between the two times, and by pulling through the main screen and the auxiliary screen to perform correction, the environmental error caused by brightness correction in different pictures can be eliminated sufficiently.

5. And the existing demura equipment is reformed, and the automatic demura processing flow under the screen for the demura in the two areas is realized.

By adopting the technical scheme, the flexible curved screen part is accurately aligned with the screen through laser positioning and a multi-degree-of-freedom rotating and translating device, an image of the flattened curved screen is obtained through curved surface movement of the camera, and the flexible curved screen is subjected to a demura process according to a conventional or unique demura process aiming at a screen area or an area under the screen, so that correction of a display effect is realized.

In order to implement the method of the embodiment of the present application, based on the same inventive concept, an embodiment of the present application further provides a curved panel display compensation apparatus, as shown in fig. 14, the apparatus includes:

the control unit 1401 is used for controlling the shooting equipment to carry out planar shooting on the curved screen when the curved screen is in a bright screen state, so as to obtain a detection image of the curved screen;

a detecting unit 1402, configured to detect the detected image based on a preset mura detection policy, and determine an abnormal pixel in the curved screen, where the abnormal pixel is displayed; determining compensation data of the abnormal pixel based on a preset compensation elimination mura strategy;

a compensation unit 1403 for compensating the abnormal pixel with the compensation data of the abnormal pixel.

the control unit 1401 is specifically configured to control the driving device to drive the camera to move and rotate, and when the positioning device detects that a normal line of the camera is aligned with a normal line of a target shooting area, control the camera to shoot the target shooting area to obtain a detection sub-image corresponding to the target shooting area; the target shooting area is an area perpendicular to the normal of the camera in the curved screen.

In some embodiments, the target photographing region includes: a plane area and a curved area of the curved screen;

the detecting an image includes: the first detection subimage is obtained by shooting the plane area, and the second detection subimage is obtained by shooting the curved surface area;

a detecting unit 1402, specifically configured to determine, from the first detection sub-image and the second detection sub-image, luminance information of a first display area and luminance information of a second display area in the curved screen; detecting the first display area based on a first mura detection strategy, and determining a first abnormal pixel of the first display area; and detecting the second display area based on a second mura detection strategy, and determining second abnormal pixels of the second display area.

In some embodiments, the detecting unit 1402 is specifically configured to determine compensation data of the abnormal pixels in the first display area based on a first compensation elimination mura policy; determining compensation data for anomalous pixels within the second display region based on a second compensation-elimination mura strategy.

In some embodiments, the first compensation-elimination mura strategy includes: determining a first difference value between the brightness value of the first abnormal pixel and a first brightness standard, and using the first difference value as compensation data of the first abnormal pixel;

the second compensation elimination mura strategy includes: and determining a second difference value between the brightness value of the second abnormal pixel and a second brightness standard, and using the second difference value as compensation data of the second abnormal pixel.

In some embodiments, the driving device drives the camera to move and rotate, so that the camera has 6 degrees of freedom.

In some embodiments, the drive device comprises a fixed bracket, a connecting piece and a rotating piece;

wherein the fixed bracket comprises a moving track; the first end of the connecting piece is connected to the moving track of the fixed bracket through the first rotating piece and moves in a first direction and a second direction along the moving track;

the connecting piece is a telescopic connecting piece and can be telescopic along a third direction;

the first rotating member can rotate the connecting member about the first direction and the second direction;

the second rotating member can rotate the camera around the third direction.

In some embodiments, the drive device comprises a stationary bracket, a first connector, a second connector, a third connector, a first rotating member, a second rotating member, and a third rotating member;

wherein the fixed bracket comprises a moving track; the first end of the first connecting piece is connected to the moving track of the fixed bracket through the first rotating piece and moves in a first direction and a second direction along the moving track;

the second end of the first connecting piece is connected with the first end of the second connecting piece through the second rotating piece, the second end of the second connecting piece is connected with the first end of the third connecting piece through the third rotating piece, and the second end of the third connecting point is fixedly provided with the camera;

at least one of the first connecting piece, the second connecting piece and the third connecting piece is a telescopic connecting piece which can be telescopic along a third direction;

the first rotating piece can enable the first connecting piece to rotate around the first direction, the second rotating piece can enable the second connecting piece to rotate around the second direction, and the third rotating piece can enable the third connecting piece to rotate around the third direction.

In some embodiments, the compensation unit 1403 is specifically configured to store the compensation data of the abnormal pixel to a flash memory unit of a flexible circuit board; controlling a display driving chip to load compensation data from the flash memory unit; and controlling the display driving chip to compensate the original data by using the compensation data of the abnormal pixel and then outputting the compensated data.

Based on the hardware implementation of each unit in the curved-surface screen display compensation device, the embodiment of the present application further provides a curved-surface screen display compensation device, as shown in fig. 15, the device includes: a processor 1501 and a memory 1502 configured to store computer programs operable on the processor;

wherein the processor 1501 is configured to execute the method steps in the previous embodiments when running the computer program.

Of course, in practice, the various components of the terminal are coupled together by a bus system 1503, as shown in FIG. 15. It is understood that the bus system 1503 is used to enable communications among the components connected thereto. The bus system 1503 includes a power bus, a control bus, and a status signal bus in addition to the data bus. For clarity of illustration, however, the various buses are designated as bus system 1503 in fig. 15.

In practical applications, the processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, and a microprocessor. It is understood that the electronic devices for implementing the above processor functions may be other devices, and the embodiments of the present application are not limited in particular.

The Memory may be a volatile Memory (volatile Memory), such as a Random-Access Memory (RAM); or a non-volatile Memory (non-volatile Memory), such as a Read-Only Memory (ROM), a flash Memory (flash Memory), a Hard Disk (HDD), or a Solid-State Drive (SSD); or a combination of the above types of memories and provides instructions and data to the processor.

In an exemplary embodiment, the present application further provides a computer-readable storage medium, such as a memory including a computer program, the computer program being executable by a processor of a curved screen display compensation device to perform the steps of the aforementioned method.

An embodiment of the present application further provides a shooting device, as shown in fig. 16, where the shooting device includes: a camera 1601, a positioning device 1602 and a driving device 1603; wherein the content of the first and second substances,

the driving device 1603 is used for driving the camera 1601 to move and rotate;

the positioning device 1602 is configured to detect whether a normal of the camera 1601 is aligned with a normal of a curved screen;

the camera 1601 is used for shooting the curved screen when the curved screen is in a bright screen state to obtain a detection image of the curved screen; the detection image is used for determining compensation data of the abnormal pixel so as to compensate the abnormal pixel through the compensation data of the abnormal pixel.

In some embodiments, the driving device 1603 drives the camera 1601 to move and rotate, so that the camera has 6 degrees of freedom, namely, a degree of freedom for moving in directions of three orthogonal coordinate axes x, y and z and a degree of freedom for rotating around the three coordinate axes.

In some embodiments, the drive apparatus 1603 includes a stationary bracket, a connection member, and a rotating member;

the second rotating member can rotate the camera around the third direction.

A specific implementation can be seen in fig. 2.

In some embodiments, the driving device 1603 comprises a fixed bracket, a first connector, a second connector, a third connector, a first rotating member, a second rotating member, and a third rotating member;

A specific implementation can be seen in fig. 3.

In some embodiments, the positioning device includes a laser emitting end and a laser receiving end, the laser emitting end emits parallel laser to the curved screen along a normal direction of the camera, and the laser receiving end receives the laser reflected by the curved screen. See fig. 4.

Adopt the shooting device that this application embodiment provided, when shooing the curved surface screen, can realize the planarization and shoot, can accurately detect the regional demonstration condition of curved surface in the curved surface screen promptly to improve the accuracy that follow-up mura detected, and the accuracy of demura (compensation elimination mura), guarantee the display effect of curved surface screen.

The technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus, and device may be implemented in other ways. The above-described embodiments are merely illustrative, and for example, the division of a unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.

Claims

1. A curved surface screen display compensation method is characterized by comprising the following steps:

2. The method of claim 1, wherein the capture device comprises: the device comprises a camera, a positioning device and a driving device, wherein the driving device is used for driving the camera to move and rotate, and the positioning device is used for detecting whether the normal of the camera is aligned with the normal of the curved screen;

the control shooting equipment carries out the planarization shooting to the curved screen, obtains the detection image of curved screen, includes:

controlling the driving device to drive the camera to move and rotate, and when the positioning device detects that the normal of the camera is aligned with the normal of the target shooting area, controlling the camera to shoot the target shooting area to obtain a detection sub-image corresponding to the target shooting area;

the target shooting area is an area perpendicular to the normal of the camera in the curved screen.

3. The method according to claim 2, wherein the target photographing region includes: a plane area and a curved area of the curved screen;

the detecting the detected image based on a preset mura detection strategy to determine abnormal pixels displaying abnormity in the curved screen comprises the following steps:

determining brightness information of a first display area and brightness information of a second display area in the curved screen from the first detection sub-image and the second detection sub-image;

detecting the first display area based on a first mura detection strategy, and determining a first abnormal pixel of the first display area;

and detecting the second display area based on a second mura detection strategy, and determining second abnormal pixels of the second display area.

4. The method of claim 3, wherein the first mura detection strategy comprises a first pixel brightness value in the first display area satisfying a first brightness criterion, the first pixel being a normal pixel; if the first brightness standard is not met, the first pixel is an abnormal pixel;

the second mura detection strategy comprises that the brightness value of a second pixel in the first display area meets a second brightness standard, and the second pixel is a normal pixel; and if the second brightness standard is not met, the second pixel is an abnormal pixel.

5. The method of claim 3, wherein the first display area is an off-screen display area corresponding to an off-screen camera, and the second display area is a main-screen display area.

6. The method according to claim 3, wherein the determining compensation data for the abnormal pixel based on a preset compensation elimination mura strategy comprises:

determining compensation data of abnormal pixels in the first display area based on a first compensation elimination mura strategy;

determining compensation data for anomalous pixels within the second display region based on a second compensation-elimination mura strategy.

7. The method of claim 6, wherein the first compensation elimination mura strategy comprises: determining a first difference value between the brightness value of the first abnormal pixel and a first brightness standard, and using the first difference value as compensation data of the first abnormal pixel;

8. The method of claim 1, wherein the compensating the abnormal pixel with the compensation data of the abnormal pixel comprises:

storing the compensation data of the abnormal pixels to a flash memory unit of a flexible circuit board;

controlling a display driving chip to load compensation data from the flash memory unit;

and controlling the display driving chip to compensate the original data by using the compensation data of the abnormal pixel and then outputting the compensated data.

9. A curved panel display compensation apparatus, the apparatus comprising:

10. A curved screen display compensation apparatus, characterized in that the apparatus comprises: a processor and a memory configured to store a computer program capable of running on the processor,

wherein the processor is configured to perform the steps of the method of any one of claims 1 to 8 when running the computer program.

11. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.

12. A photographing apparatus characterized by comprising: the device comprises a camera, a positioning device and a driving device; wherein the content of the first and second substances,

the driving device is used for driving the camera to move and rotate;

13. The apparatus according to claim 12, wherein the driving means drives the camera to move and rotate so that the camera has 6 degrees of freedom.

14. The photographing apparatus according to claim 13, wherein the driving device includes a fixed bracket, a connecting member, and a rotating member;

the second rotating member can rotate the camera around the third direction.

15. The photographing apparatus according to claim 14, wherein the driving device includes a fixed bracket, a first link, a second link, a third link, a first rotating member, a second rotating member, and a third rotating member;

16. The photographing apparatus according to claim 14 or 15, wherein the moving rail on the fixing bracket is a circular arc rail, and a bending direction of the circular arc rail coincides with a bending direction of the curved screen.

17. The shooting device of claim 12, wherein the positioning device comprises a laser emitting end and a laser receiving end, the laser emitting end emits parallel laser to the curved screen along a normal direction of the camera, and the laser receiving end receives the laser reflected by the curved screen.