CN110379350B - Color cast correction information setting method and device, image processing method and device, and display device - Google Patents
Color cast correction information setting method and device, image processing method and device, and display device Download PDFInfo
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Abstract
The invention discloses a color cast correction information setting method and device, an image processing method and device and display equipment, and relates to the technical field of image processing to reduce color cast of an image displayed by a display panel. The setting method comprises the steps of receiving pixel arrangement information of a first display area and at least one second display area, and obtaining a brightness adjusting parameter of each color pixel in each second display area according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area; a corrected power supply signal voltage expression for each color pixel in each second display region is obtained as color shift correction information based on each color pixel luminance adjustment parameter and corresponding color pixel drive information in each second display region. The processing method applies the set expression of the corrected supply signal voltage. The color cast correction information setting method provided by the invention is used for image processing.
Description
Technical Field
The present invention relates to the field of image processing technologies, and in particular, to a color shift correction method and apparatus, an image processing method and apparatus, and a display device.
Background
With the development of display technology, electronic display products such as mobile phones and tablet computers have more and more functions, and higher use experience is brought to users. For example: the existing electronic display products such as mobile phones and tablet computers are all provided with components such as front-facing cameras and earphones, so that the use experience of users is improved. However, the screen occupation of the electronic display product is limited to a certain extent by components such as the front camera and the receiver.
In order to solve the above problems, when the display panel is manufactured, the pixel area included in the display panel is divided into a low-density pixel area and a normal-density pixel area, and meanwhile, the front camera, the receiver and other components are arranged below the low-density pixel area, so that the front camera, the receiver and other components can play the functions thereof, and the screen occupation ratio of the electronic display product is improved. However, since the pixel region included in the display panel is divided into the low-density pixel region and the normal-density pixel region, the color shift of the image displayed on the display panel is large.
Disclosure of Invention
The invention aims to provide a color cast correction method and device, an image processing method and device and a display device, so as to reduce the color cast of an image displayed by a display panel.
In order to achieve the above object, the present invention provides a color shift correction information setting method. The color shift correction information setting method includes:
receiving pixel arrangement information of a display area, wherein the pixel arrangement information of the display area comprises pixel arrangement information of a first display area and pixel arrangement information of at least one second display area, and the pixel density of the at least one second display area is smaller than that of the first display area;
obtaining a brightness adjusting parameter r of each color pixel in each second display area according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area;
and obtaining a corrected power supply signal voltage expression of each color pixel in each second display area as color shift correction information according to each color pixel brightness adjusting parameter r and corresponding color pixel driving information in each second display area.
Compared with the prior art, in the color cast correction information setting method provided by the invention, based on the characteristic that the ratio of the brightness of the images displayed by the two display areas to the number of different primary color pixels contained in the two display areas is related, the brightness adjusting parameter r of each color pixel in each second display area can be obtained according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area; then, according to the brightness adjustment parameter r of each color pixel in each second display region and the corresponding color pixel driving information, a corrected power supply signal voltage expression of each color pixel in each second display region can be obtained as color shift correction information. Based on this, before displaying the image, the power supply signal voltage of the corresponding color pixel in each second display region can be controlled according to the corrected power supply signal voltage expression of each color pixel in each second display region, and then the brightness of the corresponding color pixel in each second display region can be controlled, so that the difference value between the brightness of the first display region and the brightness of each second display region is smaller than the preset difference value, and thus the color cast of the image caused by the different density proportions of the pixels of the various colors in the first display region and the second display region can be reduced.
The invention also provides a color cast correction information setting device. The color shift correction information setting device includes:
the receiving and sending unit is used for receiving pixel arrangement information of a display area, wherein the pixel arrangement information of the display area comprises pixel arrangement information of a first display area and pixel arrangement information of at least one second display area, and the pixel density of the at least one second display area is smaller than that of the first display area;
the adjusting parameter setting unit is used for obtaining the brightness adjusting parameter r of each color pixel in each second display area according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area;
and a correction information setting unit for obtaining a correction power supply signal voltage expression for each color pixel in each second display region as color shift correction information, based on each color pixel luminance adjustment parameter r and corresponding color pixel drive information in each second display region.
Compared with the prior art, the color cast correction information setting device provided by the invention has the same beneficial effects as the color cast correction information setting method, and the details are not repeated herein.
The invention also provides an image processing method. The image processing method comprises the following steps:
receiving image information;
and correcting the color cast of the image information according to the color cast correction information, wherein the color cast correction information is the color cast correction information set by the color cast correction information setting method.
Compared with the prior art, the image processing method provided by the invention has the same beneficial effect as the color cast correction information setting method, and is not repeated herein.
The present invention also provides an image processing apparatus, comprising:
a transceiver for receiving image information;
and the processor is used for correcting the color cast of the image information according to the color cast correction information, wherein the color cast correction information is set by adopting the color cast correction information setting method.
Compared with the prior art, the image processing apparatus provided by the present invention has the same beneficial effects as the above-mentioned color shift correction information setting method, and is not described herein again.
The invention also provides a computer storage medium. The computer storage medium stores instructions that, when executed, implement the color shift correction information setting method and/or the image processing method.
Compared with the prior art, the beneficial effects of the computer storage medium provided by the invention are the same as those of the color cast correction information setting method, and are not described herein again.
The invention also provides a display device. The display device comprises the color shift correction information setting device and/or the image processing device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:
FIG. 1 is a first schematic structural diagram of a display device in the prior art;
FIG. 2 is a diagram illustrating a second structure of a display device according to the prior art;
FIG. 3 is a schematic structural diagram of a display device in the prior art;
FIG. 4 is a schematic diagram of a display panel according to the prior art;
fig. 5 is a schematic view of a structure of a light emitting device in the prior art;
fig. 6 is a structural diagram of a conventional 2T1C pixel compensation circuit;
fig. 7 is a first flowchart of a color shift correction information setting method according to an embodiment of the present invention;
fig. 8 is a second flowchart of a color shift correction information setting method according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a conventional pentile pixel arrangement of a display panel;
FIG. 10 is a gamma curve of a red pixel of an original image;
FIG. 11 is a gamma curve for a green pixel of an original image;
FIG. 12 is a gamma curve of a blue pixel of an original image;
fig. 13 is a third flowchart of a color shift correction information setting method according to an embodiment of the present invention;
FIG. 14 is a first flowchart of an image processing method according to an embodiment of the present invention;
FIG. 15 is a flowchart illustrating a second image processing method according to an embodiment of the present invention;
FIG. 16 is a gamma curve for a red pixel of a processed image;
FIG. 17 is a gamma curve for a green pixel of a processed image;
FIG. 18 is a gamma curve for a blue pixel of a processed image;
fig. 19 is a first schematic structural diagram of an image processing terminal according to an embodiment of the present invention;
fig. 20 is a schematic structural diagram of a second image processing terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural diagram of a display device. As shown in fig. 1, the display apparatus includes a display panel 100 and a display control device 200.
As shown in fig. 2, the display control apparatus 200 mainly includes a central processing unit 210, a display controller 220 and a driving chip 230. As shown in fig. 3, the display controller 220 includes a frame memory control module 221, an image processing module 222, a timing control module 223, and a display memory 224; the driving chip 230 shown in fig. 2 includes a scan driving unit 231 and a data driving unit 232. The frame memory control module 221 is electrically connected with the video memory 224, the central processing unit 210 is in communication connection with the frame memory control module 221, the image processing module 222 is connected with the frame memory control module 221, the image processing module 222 is in communication connection with the time sequence control module 223, and the time sequence control module 223 is connected with the scanning driving unit 231 and the data driving unit 232 through scanning control links. It should be understood that the conventional timing controller is only used to generate the sync signal and has no processing function for the video signal, but with the development of display control technology, the currently used timing controller has been integrated with an image processing function so that the timing controller can process the video signal.
As shown in fig. 3, the display panel 100 may be of various types, such as an Organic Light-Emitting Diode (OLED) display panel, but is not limited thereto. For the OLED display panel, as shown in fig. 3 and 4, the display panel should include a display driving circuit and arrayed light emitting devices EL arranged in a stack. And a pixel compensation circuit DC for arraying the display driving circuit. The arrayed pixel compensation circuit DC is electrically connected to the arrayed light emitting devices EL. The arrayed pixel compensation circuit PDC is electrically connected to the scan driving unit 231 and the data driving unit 232 shown in fig. 3 at the same time, and of course, the pixel compensation circuit PDC should be connected to some wirings required for pixel compensation, such as power supply wirings.
As shown in fig. 4, each pixel of the display panel includes a pixel compensation circuit PDC and a light emitting device EL.
As shown in fig. 5, the light emitting device EL shown in fig. 4 has a sandwich structure, and specifically includes a cathode layer CA, AN anode layer AN, and a light emitting functional layer LFU located between the anode layer AN and the cathode layer CA. As shown in fig. 5, the light emitting functional layer LFU includes an electron injection layer EIL, an electron transport layer ETL, a light emitting layer LU, a hole transport layer HTL, and a hole injection layer HIL, which are stacked.
When the light emitting device EL shown in fig. 5 needs to emit light, the anode layer AN injects holes into the hole injection layer HIL and transports the holes to the light emitting layer through the hole transport layer HTL. Meanwhile, the cathode layer CA injects electrons into the electron injection layer EIL and is transported to the light emitting layer LU through the electron transport layer ETL. Finally, the electrons and holes are combined into excitons in the light-emitting layer LU, and the energy of the excitons is transferred and released as light, thereby achieving the purpose of light emission of the light-emitting device EL shown in fig. 4.
The pixel compensation circuit DC shown in fig. 4 may be any one of a 2T1C pixel compensation circuit and a 3T1C pixel compensation circuit, but is not limited thereto. In any case, however, the pixel compensation circuit includes a storage capacitor Cst, a switching transistor, and a driving transistor DTFT for driving the light emitting device EL to emit light, specifically, see the 2T1C pixel compensation circuit shown in fig. 6. In the 2T1C pixel compensation circuit, the switching transistor STFT is controlled to be turned on by a GATE signal supplied from the GATE signal terminal GATE, and the DATA signal supplied from the DATA signal terminal DATA causes the DATA voltage to be written into the storage capacitor Cst via the switching transistor STFT. The storage capacitor Cst controls the driving transistor DTFT to maintain a conductive state so that the power signal provided from the power signal terminal ELVDD drives the light emitting device EL to emit light through the driving transistor DTFT, it being understood that the cathode of the light emitting device should be connected to the power common terminal ELVSS. It should be understood that the above-described switching transistor STFT and driving transistor DTFT are generally both selected thin film transistors. The type of the thin film transistor may be an NMOS type thin film transistor or a PMOS type thin film transistor, which is different only in the on condition. For an NMOS type thin film transistor, a high level is turned on, and a low level is turned off; for a PMOS type thin film transistor, the low level is on and the high level is off.
Functional components such as a front camera and an earphone are further arranged on the existing display panel so as to improve the use experience of a user. However, these functional components also affect the screen fraction of the display panel. In order to improve the screen occupation ratio of the display panel, these functional components may be disposed below the display panel. For example: the color of the front camera is still arranged below the display panel in the prior art, and the display panel is lower in the pixel density setting of the pixel area corresponding to the front camera, so that the light transmittance of the display panel is increased, and the display panel has higher screen occupation ratio on the premise of ensuring the image acquisition function of the front camera. However, since the pixel density of the area of the display panel corresponding to the front camera is set to be relatively low, the pixel density of the other area of the display panel is normal, or the pixel density of the other area of the display panel is higher than that of the area of the display panel corresponding to the front camera, the image brightness of the area of the display panel corresponding to the front camera is lower than that of the other area, and thus the color cast problem is likely to occur in the image displayed by the display panel. Here, the area of the display panel corresponding to the non-front camera is defined as a normal density area, i.e., a first display area I shown in fig. 9, and the area of the display panel corresponding to the front camera is defined as a low density area, i.e., a second display area II shown in fig. 9. It should be understood that the second display area may be one or multiple, and is determined according to the number of the front cameras.
In view of the above problems, embodiments of the present invention provide a method for setting color shift correction information. The color shift correction information set by the color shift correction information setting method can correct the color shift of the image. As shown in fig. 7, the color shift correction information setting method includes:
step S110: receiving pixel arrangement information of a display area, wherein the pixel arrangement information of the display area comprises pixel arrangement information of a first display area and pixel arrangement information of at least one second display area, and the pixel density of the at least one second display area is smaller than that of the first display area. It should be understood that the pixel density of the second display region is less than the pixel density of the first display region herein, which means that the density of the at least one color pixel in the second display region is less than the density of the first display region.
Step S120: and obtaining the brightness adjusting parameter r of each color pixel in each second display area according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area.
Step S130: a corrected power supply signal voltage expression for each color pixel in each second display region is obtained as color shift correction information on the basis of each color pixel luminance adjustment parameter r and corresponding color pixel drive information in each second display region.
As can be seen from the specific process of the color shift correction information setting method, based on the characteristic that the ratio of the brightness of the images displayed in the two display regions to the number of pixels with different primary colors (i.e., different colors) contained in the two display regions is related, the brightness adjustment parameter r of each color pixel in each second display region can be obtained according to the pixel arrangement information of the first display region and the pixel arrangement information of each second display region; then, according to the brightness adjustment parameter r of each color pixel in each second display region and the corresponding color pixel driving information, a corrected power supply signal voltage expression of each color pixel in each second display region can be obtained as color shift correction information. Based on this, before displaying the image, the power supply signal voltage of the corresponding color pixel in each second display region can be controlled according to the corrected power supply signal voltage expression of each color pixel in each second display region, and then the brightness of the corresponding color pixel in each second display region can be controlled, so that the difference value between the brightness of the first display region and the brightness of each second display region is smaller than the preset difference value, and thus the color cast of the image caused by the different density proportions of the pixels of the various colors in the first display region and the second display region can be reduced.
In some embodiments, as shown in fig. 8, obtaining the per-color pixel luminance adjustment parameter r within each second display region according to the pixel arrangement information of the first display region and the pixel arrangement information of each second display region includes:
step S121: and obtaining the quantity proportion of each color pixel of the first display area according to the pixel arrangement information of the first display area.
Step S122: and obtaining the number proportion of the pixels of various colors in each second display area according to the pixel arrangement information of each second display area.
Step S123: and obtaining the brightness adjusting parameter r of each color pixel in each second display area according to the quantity proportion of each color pixel in the first display area and the quantity proportion of each color pixel in each second display area, so that the brightness proportion of each color pixel in the first display area is equal to that in the second display area. It should be understood that, the density of the same color pixel in two different display areas is different, and then the color image displayed by the color pixel in the display area with the lower density has lower brightness, and the color image displayed by the color pixel in the display area with the higher density has higher brightness. However, the color shift problem occurs in the entire image when the images displayed in the first display area and the second display area are viewed as an entire image due to the difference between the ratio of the number of pixels of each color in the first display area and the ratio of the number of pixels of each color in the second display area. Based on this, the brightness of each color contained in the second display region should be adjusted to ensure that the brightness ratios of the pixels of each color in the first display region and the second display region are equal, so that the brightness ratios of the pixels of each color in the first display region and the second display region can be ensured to be equal.
To describe the color shift correction information setting method provided in the embodiment of the present invention in detail, a display panel with a pentile pixel arrangement mode is taken as an example to describe a color shift correction information setting process of the display panel.
Fig. 9 shows a schematic diagram of a pixel arrangement of a display panel according to a pentile pixel arrangement. As shown in fig. 9, the pixel types of the display panel include two types, the first type of pixel includes a red pixel R and a green pixel G, and the second type of pixel includes a blue pixel B and a green pixel G. One first-type pixel point and one second-type pixel point form a repeating unit. The display panel shown in fig. 9 includes a first display region I and a second display region II.
The pixel arrangement diagram of the display panel shown in fig. 9 includes 1/2 where the density of the red pixels R of the second display region is equal to the density of the red pixels R of the first display region, 1/2 where the density of the blue pixels R of the second display region is equal to the density of the blue pixels R of the first display region, and 1/4 where the density of the green pixels R of the second display region is equal to the density of the green pixels R of the first display region. Meanwhile, the ratio of the number of red pixels, the number of green pixels, and the number of blue pixels of the first display region is 1: 2: 1. the ratio of the number of red pixels, the number of green pixels and the number of blue pixels in the second display region is 1: 1: 1.
fig. 10 shows a gamma curve of a red pixel of an original image. The a curve in fig. 10 is a gamma curve of the red pixel in the first display region, and the b curve in fig. 10 is a gamma curve of the red pixel in the second display region. As can be seen from curves a and b in fig. 10: the ratio of the emission luminance L1R of the red pixel in the first display region to the emission luminance L2R of the red pixel in the second display region is equal to the ratio of the density of the red pixel in the first display region to the density of the red pixel in the second display region, i.e., L1R/L2R is 2.
Fig. 11 shows a gamma curve of a green pixel of an original image. The curve a in fig. 11 is a gamma curve of the green pixels in the first display region, and the curve b in fig. 11 is a gamma curve of the green pixels in the second display region. As can be seen from curves a and b in fig. 11: the ratio of the green pixel light emission luminance L1G of the first display region to the green pixel light emission luminance L2G of the second display region is equal to the ratio of the green pixel density of the first display region to the green pixel density of the second display region, i.e., L1G/L2G is 4.
Fig. 12 shows a gamma curve of a blue pixel of an original image. The a curve in fig. 12 is a gamma curve of the blue pixel in the first display region, and the b curve in fig. 12 is a gamma curve of the blue pixel in the second display region. As can be seen from curves a and b in fig. 12: the ratio of the blue pixel light emission luminance L1B of the first display region to the blue pixel light emission luminance L2B of the second display region is equal to the ratio of the blue pixel density of the first display region to the blue pixel density of the second display region, i.e., L1B/L2B is 2.
When the ratio of the light emitting brightness of the red pixel R, the green pixel G and the blue pixel in the first display region is L1R: L1G: L1B, the second display is performedThe ratio of the light emitting luminance of the red pixel R, the green pixel G and the blue pixel in the region is L2R: L2G: L2B. Since L1R/L2R is 2, L1G/L2G is 4, and L1B/L2B is 2, L2R: L2G: L2B is L1R/2: L1G1/4: L1B/2 is L1R: L1G/2: L1B. Therefore, for the display panel with the pentile pixel arrangement mode, the color cast of the original image is mainly caused by that the number ratio of each color pixel in the first display area is different from that in each second display area. Based on this, since the ratio of the light emission luminances of the red pixel R, the green pixel G, and the blue pixel B in the first display region is L1R: L1G: L1B, and the ratio of the light emission luminances of the red pixel R, the green pixel G, and the blue pixel B in the second display region is L1R: L1G/2: L1B, in order to ensure that the proportion of the emission luminance of the red pixel R, the green pixel G and the blue pixel B in the first display region is equal to the proportion of the emission luminance of the red pixel R, the green pixel G and the blue pixel B in the second display region, the red pixel luminance adjusting parameter R in the second display region R Blue pixel brightness adjustment parameter r ═ 1 B Green pixel brightness adjustment parameter r ═ 1 G ＝2。
In addition, when the ratio of the number of red pixels, the number of green pixels and the number of blue pixels in the first display region is 1: 2: 1, the ratio of the number of red pixels, the number of green pixels and the number of blue pixels in the second display area is 1: 1: 1, therefore, according to the difference value of the two, the brightness adjusting parameter r of the red pixel in the second display area can also be obtained R Blue pixel brightness adjustment parameter r ═ 1 B Green pixel brightness adjustment parameter r ═ 1 G ＝2。
In some embodiments, as shown in fig. 13, the corrected power supply signal voltage V of each color pixel in each second display region is obtained as color shift correction information based on each color pixel luminance adjustment parameter L1G and corresponding color pixel drive information in each second display region ELVDD The method comprises the following steps:
step S131: obtaining a pixel driving current expression of each color pixel in each second display area according to the pixel brightness adjusting parameter L1G and the pixel driving current expression of each color pixel in each second display area; the pixel drive current expression of each color pixel in each second display region is as follows:
i is the pixel drive current, V, of each color pixel in each second display region ELVDD0 For each color pixel in the second display region data0 K is a constant, which is a conduction factor of the driving transistor, for the initial data signal voltage of each color pixel in the second display region.
It should be understood that the pixel drive current formula
The luminance of the pixel is proportional to the driving current, so to ensure that the luminance of the same color displayed in the first display area and the luminance of the same color displayed in the second display area are equal, the derivation process of the expression of the driving current of each color pixel in the second display area is as follows:
step S132: a corrected power supply signal voltage expression for each color pixel in each second display region is obtained from the pixel drive current expression for each color pixel in each second display region. The corrected power supply signal voltage expression for each color pixel in each second display region is:
In an exemplary manner, the first and second electrodes are,
as can be seen from this, it is possible to see,
it can be seen that the corrected power supply signal voltage V for each color pixel in each second display region can be obtained from the initial power supply signal voltage and the initial data signal voltage for that color pixel in the second display region contained in the image information ELVDD . When the number r is equal to 2, the reaction solution,
it should be understood that when r is 1, it is explained that the pixel density of the color of the first display region and the second display region is the same, and V is the same when V ELVDD ＝V ELVDD0 Therefore, the corrected power supply signal voltage V of the color pixel in the second display region is adopted ELVDD And controlling the power supply signal voltage of the color pixel in the second display area corresponding to the control image information, which is equivalent to the power supply signal voltage of the color pixel in the second display area corresponding to the control image information.
In consideration of the linear relationship between the data signal voltage and the gray scale, therefore, as shown in fig. 13, after obtaining the expression of the corrected power supply signal voltage for each color pixel in each second display region, obtaining the expression of the corrected power supply signal voltage for each color pixel in each second display region as the color shift correction information based on the luminance adjustment parameter for each color pixel in each second display region and the corresponding color pixel driving information further includes:
step S133: converting the corrected power supply signal voltage expression of each color pixel in each second display region according to the relation between the data signal voltage and the gray scale so that the corrected power supply signal voltage expression of each color pixel in each second display region is:
It should be understood that the relationship between the data signal voltage and the gray level is V data0 A × gray + b, and therefore,
can be converted into
From the above, V ELVDD As a function of the degree of gray, i.e. V ELVDD F (gray), so that the corrected power supply signal voltage V of each color pixel in each second display region ELVDD The linear relation exists with the gray-scale value of the color pixel in the second display area, so that when the color cast processing is carried out on the image information, the corrected power supply signal voltage V of each color pixel in each second display area can be obtained according to the gray-scale value of the color pixel in the second display area contained in the image information ELVDD 。
When the r is 2, the reaction time is as short as possible,
as shown in fig. 7 and fig. 19, the embodiment of the present invention further provides a color shift correction information setting apparatus 300. The color shift correction information includes:
the transceiver unit 310 is configured to receive pixel arrangement information of a display area, where the pixel arrangement information of the display area includes pixel arrangement information of a first display area and pixel arrangement information of at least one second display area, and a pixel density of the at least one second display area is smaller than a pixel density of the first display area;
and an adjusting parameter setting unit 320, communicatively connected to the transceiver unit 310, configured to obtain, according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area, a pixel brightness adjusting parameter r for each color in each second display area.
And a correction information setting unit 330, communicatively connected to the adjustment parameter setting unit 320, for obtaining a corrected power supply signal voltage expression for each color pixel in each second display region as color shift correction information, based on the per-color pixel luminance adjustment parameter r and the corresponding color pixel driving information in each second display region. The corresponding color pixel drive information may be stored in an internal memory or an external memory.
The implementation process of the color shift correction information setting apparatus 300 according to the embodiment of the present invention refers to the color shift correction information setting method in the foregoing, and the beneficial effects thereof are the same as those of the color shift correction information setting method described above, which are not described herein again. It should be understood that the functions of the adjustment parameter setting unit 320 and the correction information setting unit 330 may be integrated into one processor. The processor may be a single processor or may be a collection of processing elements. For example: the processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention. For example: one or more microprocessors (digital signal processors, DSP for short), or one or more Field Programmable Gate arrays (FPGA for short).
In some embodiments, as shown in fig. 8 and fig. 19, the adjustment parameter setting unit 320 is specifically configured to obtain a ratio of the number of pixels of each color in the first display area according to the pixel arrangement information of the first display area; obtaining the quantity proportion of various color pixels of each second display area according to the pixel arrangement information of each second display area; and obtaining the brightness adjusting parameter r of each color pixel in each second display area according to the quantity proportion of each color pixel in the first display area and the quantity proportion of each color pixel in each second display area, so that the brightness proportion of each color pixel in the first display area is equal to that in the second display area.
In some embodiments, as shown in fig. 13 and fig. 19, the correction information setting unit 330 is specifically configured to obtain a pixel driving current expression for each color pixel in each second display region according to the pixel driving current formula and the brightness adjustment parameter for each color pixel in each second display region; obtaining a corrected power supply signal voltage expression of each color pixel in each second display area according to the pixel driving current expression of each color pixel in each second display area; the pixel drive current expression of each color pixel in each second display region is as follows:
the corrected power supply signal voltage for each color pixel in each second display region is expressed as
I is the pixel drive current, V, of each color pixel in each second display region ELVDD Correcting power supply signal voltage, V, for each color pixel in each second display region ELVDD0 For the initial power supply signal voltage, V, of each color pixel in the second display region data0 K is a constant for the initial data signal voltage of each color pixel in the second display region.
In some embodiments, as shown in fig. 13 and 19, the correction information setting unit 330 is further configured to convert the corrected power supply signal voltage expression for each color pixel in each second display region according to the relationship between the data signal voltage and the gray scale such that the corrected power supply signal voltage expression for each color pixel in each second display region is
gray is a gray level value of each color pixel in the second display region, a is a slope of a relation between the data signal voltage and the gray level, and b is an intercept of the relation between the data signal voltage and the gray level.
The embodiment of the invention also provides an image processing method. As shown in fig. 14, the image processing method includes:
step S210: receiving image information;
step S240: and correcting the color cast of the image information according to the color cast correction information. The color shift correction information is the color shift correction information set by the color shift correction information setting method. Therefore, in the image processing method provided by the embodiment of the invention, the color cast of the image information only needs to be corrected by utilizing the color cast correction information, and the display panel does not need to be greatly changed, so that the cost is favorably reduced.
Compared with the prior art, the image processing method provided by the embodiment of the invention has the same beneficial effects as the color cast correction information setting method, and is not repeated herein.
In some embodiments, for an image displayed on a display panel with a pentile pixel arrangement, due to the particularity of the pixel arrangement, it is necessary to perform pixel rendering on the image information before correcting color shift according to the color shift correction information. Based on this, as shown in fig. 14, before correcting color shift of the image information according to the color shift correction information after receiving the image information, the image processing method further includes:
step S220: and rendering the pixels contained in the image information by adopting a pixel rendering method. The Pixel rendering method is an spr (sub Pixel rendering) technique, which is a Pixel rendering method set for a pentile Pixel arrangement manner.
In some embodiments, in view of processing only the pixel information of the second display region corresponding to the image information when correcting the color shift of the image information according to the color shift correction information, as shown in fig. 14, the image processing method further includes, after receiving the image information and before correcting the color shift of the image information according to the color shift correction information:
step S230: and judging whether the pixel coordinates contained in the image information are positioned in the second display area. If so, step S240 is performed. Otherwise, ending.
It should be understood that, as shown in fig. 14, if there is step S220, the execution sequence of step S220 and step S230 is not limited, and step S220 may be executed before step S230, or step S230 may be executed before step S220. When step S230 is performed before step S220, then step S230 should be performed before step S240 is performed.
In some embodiments, since the color shift correction information is a correction power supply signal voltage expression for each color pixel in each second display region, correcting the color shift of the image information according to the color shift correction information includes:
and controlling the power supply signal voltage of the corresponding color pixel of the image information corresponding to the second display area according to the corrected power supply signal voltage expression of each color pixel in each second display area as the color cast correction information, so that the difference value between the brightness of the first display area and the brightness of each second display area is smaller than a preset difference value, wherein the preset difference value can be set according to the actual situation, and when the preset difference value is equal to 0, the picture displayed by the display panel has no color cast at all. However, it is almost impossible that the picture displayed by the display panel has no color cast at all, and therefore, the allowable size of the picture displayed by the display panel has color cast can be controlled by presetting the size of the difference.
As shown in fig. 15, correcting color shift of image information according to the color shift correction information includes:
step S241: setting a correction power supply signal voltage V of each color pixel in each second display region according to the color shift correction information ELVDD 。
Step S242: correcting power supply signal voltage V according to each color pixel in each second display region ELVDD And controlling the corresponding color pixels in each second display area to emit light, so that the difference value between the brightness of the first display area and the brightness of each second display area is smaller than a preset difference value.
If the corrected power supply signal voltage expression of each color pixel in each second display region is
Setting correction of each color pixel in each second display region according to the color shift correction informationVoltage V of power supply signal ELVDD The method comprises the following steps: according to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage V of each color pixel in the second display region ELVDD0 And an initial data signal voltage V of each color pixel in the second display region data0 Obtaining a corrected power supply signal voltage V for each color pixel in each second display region ELVDD 。
If the corrected power supply signal voltage expression of each color pixel in each second display region is
Setting a correction power supply signal voltage V of each color pixel in each second display region according to the color shift correction information ELVDD The method comprises the following steps: according to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage V of each color pixel in the second display region ELVDD0 And obtaining a gray level gray value of each color pixel in the second display region to obtain a corrected power supply signal voltage V of each color pixel in each second display region ELVDD 。
For example: fig. 9 shows a schematic diagram of a pixel arrangement of a display panel according to a pentile pixel arrangement. The corrected power supply signal voltage expression for each color pixel in the second display region is:
after receiving the image information, according to the corrected power supply signal voltage expression of each color pixel in each second display region and the initial power supply signal voltage V of each color pixel in the second display region ELVDD0 And an initial data signal voltage V of each color pixel in the second display region data0 Obtaining a corrected power supply signal voltage V for each color pixel in the second display region ELVDD . Then, the corrected power supply signal voltage V of each color pixel in the second display region is used ELVDD For image informationAnd controlling the power supply voltage in the second display area.
Fig. 16 shows the gamma curve of a red pixel of the processed image. The a curve in fig. 16 is a gamma curve of the red pixel in the first display region, and the b curve in fig. 16 is a gamma curve of the red pixel in the second display region. As can be seen from curves a and b in fig. 16: the ratio of the emission luminance L1R of the red pixel in the first display region to the emission luminance L2R of the red pixel in the second display region is equal to the ratio of the density of the red pixel in the first display region to the density of the red pixel in the second display region, i.e., L1R/L2R is 2.
Fig. 17 shows the gamma curve of the green pixels of the processed image. The a curve in fig. 17 is a gamma curve of green pixels in the first display region, and the b curve in fig. 17 is a gamma curve of green pixels in the second display region. As can be seen from curves a and b in fig. 17: the ratio of the green pixel light emission luminance L1G of the first display region to the green pixel light emission luminance L2G of the second display region is equal to the ratio of the green pixel density of the first display region to the green pixel density of the second display region, i.e., L1G/L2G is 2.
Fig. 18 shows the gamma curve of the blue pixels of the processed image. The a curve in fig. 18 is a gamma curve of the blue pixel in the first display region, and the b curve in fig. 18 is a gamma curve of the blue pixel in the second display region. As can be seen from curves a and b in fig. 18: the ratio of the blue pixel light emission luminance L1B of the first display region to the blue pixel light emission luminance L2B of the second display region is equal to the ratio of the blue pixel density of the first display region to the blue pixel density of the second display region, i.e., L1B/L2B is 2.
When the ratio of the light emission luminances of the red pixel R, the green pixel G, and the blue pixel B in the first display region is L1R: L1G: L1B, the ratio of the light emission luminances of the red pixel R, the green pixel G, and the blue pixel B in the second display region is L2R: L2G: L2B. Since L1R/L2R is 2, L1G/L2G is 2, and L1B/L2B is 2, L2R: L2G: L2B is L1R/2: L1G/2: L1B/2 is L1R: L1G: L1B. Therefore, for the display panel with the pentile pixel arrangement mode, the proportion of the number of the pixels of various colors in the first display area is the same as that of the pixels of various colors in each second display area, so that the proportion of the light-emitting brightness of the red pixel R, the green pixel G and the blue pixel B in the first display area is equal to the proportion of the light-emitting brightness of the red pixel R, the green pixel G and the blue pixel B in the second display area, and the problem of color cast of a processed image is avoided.
The embodiment of the invention also provides an image processing device. As shown in fig. 14 and 19, the image processing apparatus 400 is configured to execute the above-described image processing method. The image processing apparatus 400 includes:
a transceiver 410 for receiving image information;
the processor 420 is configured to correct color shift of the image information according to color shift correction information, where the color shift correction information is color shift correction information set by using the color shift correction information setting method.
Compared with the prior art, the beneficial effects of the image processing apparatus 400 provided by the embodiment of the present invention are the same as the beneficial effects of the color shift correction information setting method described above, and are not described herein again.
It is to be understood that the color shift correction information described above can be stored in the memory 430, as shown in fig. 19, for ready retrieval by the processor 420. Based on this, the image processing apparatus 400 further includes a memory 430, and the memory 430 is used for storing the color shift correction information set by the color shift correction information setting method.
In some embodiments, as shown in fig. 19, the processor 420 is specifically configured to control the power supply signal voltage of the corresponding color pixel of the image information corresponding to the second display region according to the corrected power supply signal voltage expression of each color pixel in each second display region as the color shift correction information, so that the difference between the luminance of the first display region and the luminance of each second display region is smaller than the preset difference.
As shown in fig. 15 and 19, the processor 420 is specifically configured to set the correction power supply signal voltage V of each color pixel in each second display region according to the color shift correction information ELVDD (ii) a According to the correction electricity of each color pixel in each second display regionSource signal voltage V ELVDD And controlling the corresponding color pixels in each second display area to emit light, so that the difference value between the brightness of the first display area and the brightness of each second display area is smaller than a preset difference value.
If the corrected power supply signal voltage expression of each color pixel in each second display region is
According to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage V of each color pixel in the second display region ELVDD0 And an initial data signal voltage V of each color pixel in the second display region data0 Obtaining a corrected power supply signal voltage V for each color pixel in each second display region ELVDD 。
If the voltage expression of the corrected power supply signal of each color pixel in each second display region is
According to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage V of each color pixel in the second display region ELVDD0 And obtaining a gray level gray value of each color pixel in the second display region to obtain a corrected power supply signal voltage V of each color pixel in each second display region ELVDD 。
In some embodiments, as shown in fig. 14 and 19, the processor 420 is further configured to render the pixels contained in the image information by using a pixel rendering method before correcting the color shift of the image information according to the color shift correction information.
In some embodiments, as shown in fig. 14 and 19, the processor 420 is further configured to perform color shift correction of the image information according to the color shift correction information when pixel coordinates included in the image information are located in the second display region before color shift correction of the image information according to the color shift correction information.
The embodiment of the invention also provides a computer storage medium. The computer storage medium stores instructions that, when executed, implement the color shift correction information setting method and/or the image processing method.
The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer storage media may be any available media that a computer can store or a data storage device, such as a server, data center, etc., that includes an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
As shown in fig. 19, an embodiment of the present invention also provides a display device. The display device includes an image processing terminal and a display panel. The image processing terminal includes the color shift correction information setting device 300 and/or the image processing device 400. It should be understood that, since, at the time of image processing, it is necessary to correct the power supply signal voltage V according to each color pixel in each second display region ELVDD And controlling the corresponding color pixel in each second display area to emit light, so that the pixel corresponding to the first display area and the pixel corresponding to the second display area cannot share the power supply signal terminal.
As shown in fig. 19, when the display device includes the color shift correction information setting apparatus 300 and the image processing apparatus 400, the transceiver 310 included in the color shift correction information setting apparatus 300 communicates with the transceiver 410 included in the image processing apparatus 400.
Compared with the prior art, the beneficial effects of the display device provided by the embodiment of the present invention are the same as the beneficial effects of the color shift correction information setting apparatus 300, and are not described herein again.
As shown in fig. 20, an embodiment of the present invention further provides an image processing terminal. The image processing terminal includes a processor 420, a memory 430, a transceiver 410, and a bus 440; the processor 420, memory 430 and transceiver 410 communicate with each other over a bus 440. The memory 430 is used for storing computer instructions, and the processor 420 is used for executing the computer instructions to execute the image processing method and/or the color shift correction information setting method.
The processor 420 according to the embodiment of the present invention may be a single processor, or may be a general term for multiple processing elements. For example, the processor 420 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present invention, such as: one or more microprocessors (digital signal processors, DSP for short), or one or more Field Programmable Gate arrays (FPGA for short).
The memory 430 may be a single storage device or a combination of multiple storage elements, and is used for storing executable program codes and the like. And the memory 430 may include a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, a Flash memory (Flash), and the like.
The bus 440 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 440 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 20, but this is not intended to represent only one bus or type of bus.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention 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 invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. A color shift correction information setting method is characterized by comprising the following steps:
receiving pixel arrangement information of a display area, wherein the pixel arrangement information of the display area comprises pixel arrangement information of a first display area and pixel arrangement information of at least one second display area, and the pixel density of the at least one second display area is smaller than that of the first display area;
obtaining the brightness adjusting parameter of each color pixel in each second display area according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display arear(ii) a And the number of the first and second groups,
adjusting parameters according to the brightness of each color pixel in each second display regionrAnd obtaining a correction power supply signal voltage expression for each color pixel in each second display region as color shift correction information corresponding to the color pixel drive information; wherein the content of the first and second substances,
the obtaining of the brightness adjustment parameter r of each color pixel in each second display area according to the pixel arrangement information of the first display area and the pixel arrangement information of each second display area includes:
obtaining the quantity proportion of each color pixel of the first display area according to the pixel arrangement information of the first display area;
obtaining the quantity proportion of various color pixels of each second display area according to the pixel arrangement information of each second display area; and (c) a second step of,
and obtaining a brightness adjusting parameter r of each color pixel in each second display area according to the quantity proportion of each color pixel in the first display area and the quantity proportion of each color pixel in each second display area, so that the brightness proportions of each color pixel in the first display area and the second display area are equal.
2. The method according to claim 1, wherein the parameter is adjusted according to the brightness of each color pixel in each of the second display regionsrAnd obtaining a correction power supply signal voltage for each color pixel in each second display region as color shift correction information corresponding to the color pixel drive information
The method comprises the following steps:
adjusting parameters according to the brightness of each color pixel in each second display regionrAnd a pixel drive current formula, obtaining a pixel drive current expression of each color pixel in each second display region; the pixel drive current expression of each color pixel in each second display region is as follows:
obtaining a corrected power supply signal voltage expression of each color pixel in each second display region according to the pixel driving current expression of each color pixel in each second display region, wherein the corrected power supply signal voltage expression of each color pixel in each second display region is as follows:
3. The method according to claim 2, wherein obtaining the corrected power supply signal voltage expression for each color pixel in each second display region as the color shift correction information based on the brightness adjustment parameter for each color pixel in each second display region and the corresponding color pixel drive information after obtaining the corrected power supply signal voltage expression for each color pixel in each second display region further comprises:
converting the corrected power supply signal voltage expression of each color pixel in each second display region according to the relation between the data signal voltage and the gray scale, so that the corrected power supply signal voltage expression of each color pixel in each second display region is as follows:
4. A color shift correction information setting apparatus, comprising:
the receiving and sending unit is used for receiving pixel arrangement information of a display area, wherein the pixel arrangement information of the display area comprises pixel arrangement information of a first display area and pixel arrangement information of at least one second display area, and the pixel density of the at least one second display area is smaller than that of the first display area;
a brightness parameter setting unit for obtaining brightness adjustment parameters of each color pixel in each second display region according to the pixel arrangement information of the first display region and the pixel arrangement information of each second display regionr；
A correction information setting unit for adjusting the parameter according to the brightness of each color pixel in each second display regionrAnd corresponding to the color pixel drive information, obtaining a corrected power supply signal voltage expression for each color pixel in each second display region as color shift correction information; wherein the content of the first and second substances,
the brightness parameter setting unit is specifically configured to obtain a number ratio of each color pixel of the first display area according to the pixel arrangement information of the first display area; obtaining the number proportion of various color pixels of each second display area according to the pixel arrangement information of each second display area; and obtaining a brightness adjusting parameter r of each color pixel in each second display area according to the number proportion of each color pixel in the first display area and the number proportion of each color pixel in each second display area, so that the brightness proportions of each color pixel in the first display area and the second display area are equal.
5. The device according to claim 4, wherein the correction information setting unit is configured to adjust the parameter according to a luminance of each color pixel in each of the second display regionsrAnd a pixel drive current formula for obtaining a pixel drive current expression for each color pixel in each second display region; obtaining a corrected power supply signal voltage expression of each color pixel in each second display area according to the pixel driving current expression of each color pixel in each second display area;
the pixel drive current expression of each color pixel in each second display region is as follows:
the expression of the pixel driving current of each color pixel in each second display region is as follows:
6. The color shift correction information setting apparatus according to claim 5, wherein said correction information setting unit is further configured to convert the expression of the correction power supply signal voltage for each color pixel in each of said second display regions in accordance with a relational expression between the data signal voltage and the gradation so that the expression of the correction power supply signal voltage for each color pixel in each of the second display regions is:
；graythe gray scale value of each color pixel in the second display region, a is the slope of the relation between the data signal voltage and the gray scale, and b is the data signalThe intercept of the relationship between voltage and gray scale.
7. An image processing method, comprising:
receiving image information;
correcting color shift of image information based on color shift correction information set by the color shift correction information setting method according to any one of claims 1 to 3.
8. The image processing method according to claim 7,
after the receiving the image information and before the correcting the color cast of the image information according to the color cast correction information, the image processing method further comprises the following steps:
rendering pixels contained in the image information by adopting a pixel rendering method;
and/or the presence of a gas in the gas,
after receiving the image information and before correcting the color shift of the image information according to the color shift correction information, the image processing method further includes:
judging whether pixel coordinates contained in the image information are located in the second display area;
if so, performing color shift correction of the image information according to the color shift correction information;
and/or the presence of a gas in the gas,
the correcting color shift of the image information according to the color shift correction information includes:
setting a correction power supply signal voltage of each color pixel in each second display region according to the color shift correction information
；
Correcting the power supply signal voltage according to each color pixel in each second display region
Controlling the corresponding color image in each second display areaEmitting light so that the difference value between the brightness of the first display area and the brightness of each second display area is smaller than a preset difference value;
if the corrected power supply signal voltage expression of each color pixel in each second display region is
Setting the correction power supply signal voltage of each color pixel in each second display region according to the color shift correction information
The method comprises the following steps:
according to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage of each color pixel in the second display region
And initial data signal voltage of each color pixel in the second display region
Obtaining the corrected power supply signal voltage of each color pixel in each second display region
；
If the corrected power supply signal voltage expression of each color pixel in each second display region is
Setting the correction power supply signal voltage of each color pixel in each second display region according to the color shift correction information
The method comprises the following steps:
correction according to each color pixel in each second display regionA power supply signal voltage expression, and an initial power supply signal voltage of each color pixel in the second display region
And the gray scale value of each color pixel in the second display regiongrayObtaining the corrected power supply signal voltage of each color pixel in each second display region
。
9. An image processing apparatus characterized by comprising:
a transceiver for receiving image information;
a processor for correcting color shift of image information based on color shift correction information set by the color shift correction information setting method according to any one of claims 1 to 3.
10. The image processing apparatus according to claim 9,
the image processing apparatus further comprises a memory for storing color shift correction information set by the color shift correction information setting method according to any one of claims 1 to 3; and/or the presence of a gas in the gas,
the processor is further configured to render pixels contained in the image information by using a pixel rendering method before correcting color shift of the image information according to the color shift correction information; and/or the presence of a gas in the gas,
performing color shift correction of the image information based on color shift correction information when pixel coordinates contained in the image information are located within the second display region; and/or the presence of a gas in the atmosphere,
setting a correction power supply signal voltage of each color pixel in each second display region according to the color shift correction information
(ii) a According to each second displayCorrecting power supply signal voltage for each color pixel in display area
Controlling the corresponding color pixels in each second display area to emit light, so that the difference value between the brightness of the first display area and the brightness of each second display area is smaller than a preset difference value; wherein, the first and the second end of the pipe are connected with each other,
if the corrected power supply signal voltage expression of each color pixel in each second display region is
According to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage of each color pixel in the second display region
And an initial data signal voltage for each color pixel in the second display region
Obtaining the corrected power supply signal voltage of each color pixel in each second display region
(ii) a If the voltage expression of the corrected power supply signal of each color pixel in each second display region is
According to the corrected power supply signal voltage expression of each color pixel in each second display region, the initial power supply signal voltage of each color pixel in the second display region
And the gray scale value of each color pixel in the second display regiongrayObtaining the correction of each color pixel in each second display regionPositive power supply signal voltage
。
11. A computer storage medium having stored therein instructions which, when executed, implement the color shift correction information setting method according to any one of claims 1 to 3 and/or the image processing method according to claim 7 or 8.
12. A display device comprising the color shift correction information setting apparatus according to any one of claims 4 to 6 and/or the image processing apparatus according to claim 9 or 10.
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