CN114582281A - Method and apparatus for panel display gamma correction - Google Patents
Method and apparatus for panel display gamma correction Download PDFInfo
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- CN114582281A CN114582281A CN202210264513.8A CN202210264513A CN114582281A CN 114582281 A CN114582281 A CN 114582281A CN 202210264513 A CN202210264513 A CN 202210264513A CN 114582281 A CN114582281 A CN 114582281A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a method and a device for correcting panel display gamma, belongs to the technical field of display parameter setting, and can at least partially solve the problems of long time consumption and low efficiency of the conventional method for correcting panel display gamma. The display area of the display panel comprises a transmission area for arranging the sensor under the screen and a main display area except the transmission area, wherein pixels in the transmission area are electrically connected with a first reference voltage end, and pixels in the main display area are electrically connected with a second reference voltage end; the method comprises the following steps: determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area and the display brightness of the main display area; determining gamma parameters of the main display area as correction gamma parameters of the main display area according to the display brightness distribution of the main display area and a preset standard gamma curve; and correcting the initial gamma parameter of the transmission region according to the correction gamma parameter of the main display region to obtain a correction gamma parameter of the transmission region, and determining the gamma parameter of the transmission region as the correction gamma parameter of the transmission region.
Description
Technical Field
The invention belongs to the technical field of display parameter setting, and particularly relates to a method and a device for gamma correction of panel display.
Background
Before the display panel leaves a factory, gamma (gamma) correction is needed, that is, a gamma parameter (gamma value of a gamma vector under each binding point gray scale) is set according to the actual display brightness of the display panel, so that the corrected display brightness meets a preset standard gamma curve (that is, the display brightness under each binding point gray scale is the brightness of the standard gamma curve under the corresponding binding point gray scale).
In a Display device using an off-screen sensor, such as an off-screen Camera (FDC) technology, the Camera (sensor) is disposed at a back side (a side facing away from a light emitting surface) of a Display panel, and an image is captured through a transmissive region (or FDC region) of the Display panel, where the transmissive region is a part of the Display region. In order to make the transmissive region both transmissive and displayable, the pixel design needs to be different from the main display region (or Normal region) except the transmissive region, such as the pixel density of the transmissive region is lower, or each driving circuit in the transmissive region drives a plurality of pixels.
Because of different pixel designs, the transmission region and the main display region have different display brightness under the same display parameters, and in order to ensure that the display effect of the two regions both conform to the standard gamma curve, gamma correction needs to be performed on the two regions respectively, resulting in long Tact Time (beat Time) for correction and low production efficiency.
Disclosure of Invention
The invention at least partially solves the problems of long time consumption and low efficiency of the existing panel display gamma correction method, and provides a panel display gamma correction method and a panel display gamma correction device.
In a first aspect, an embodiment of the present invention provides a method for gamma correction of panel display, where a display area of a display panel includes a transmissive area for setting an off-screen sensor and a main display area except the transmissive area, pixels in the transmissive area are electrically connected to a first reference voltage terminal, and pixels in the main display area are electrically connected to a second reference voltage terminal; the method comprises the following steps:
determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area and the display brightness of the main display area;
according to the display brightness distribution of the main display area and a preset standard gamma curve, determining gamma parameters of the main display area as correction gamma parameters of the main display area;
and correcting the initial gamma parameter of the transmission region according to the correction gamma parameter of the main display region to obtain a transmission region correction gamma parameter, and determining the gamma parameter of the transmission region as the transmission region correction gamma parameter.
Optionally, the determining, according to the difference between the display brightness of the transmissive area and the display brightness of the main display area, that the voltage provided to the first reference voltage end is the first correction reference voltage includes:
determining the voltage provided for the first reference voltage end as a first correction reference voltage according to a pre-obtained standard difference value;
the standard difference value is a difference value between the display brightness of the transmission area and the display brightness of the main display area when a first initial reference voltage is provided to the first reference voltage end, a second initial reference voltage is provided to the second reference voltage end, and the transmission area and the main display area both display standard gray scales.
Optionally, the determining, according to the difference between the display brightness of the transmissive area and the display brightness of the main display area, that the voltage provided to the first reference voltage end is the first correction reference voltage includes:
providing a first initial reference voltage to the first reference voltage end, providing a second initial reference voltage to the second reference voltage end, enabling the transmission area and the main display area to display standard gray scales, measuring the display brightness of the transmission area and the display brightness of the main display area, and determining a standard difference value between the display brightness of the transmission area and the display brightness of the main display area;
and determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the standard deviation value.
Optionally, the standard gray scale is a gray scale that makes the display brightness of the main display area closest to a preset standard brightness when a second initial reference voltage is provided to a second reference voltage terminal.
Optionally, the determining, according to the display brightness distribution of the main display area and a preset standard gamma curve, the gamma parameter of the main display area as a main display area correction gamma parameter includes:
enabling the main display area to display a preset binding point gray scale, and detecting the binding point gray scale brightness of the detection position of the main display area;
and determining the gamma value of the main display area under the binding point gray scale according to the difference value between the binding point gray scale brightness and the brightness of the standard gamma curve under the corresponding binding point gray scale.
Optionally, the detection position is located between the geometric center of the display area and the transmission area.
Optionally, the display area has a height direction and a width direction perpendicular to each other;
along the height direction, the transmission area is positioned on the first side of the central line of the display area;
the detection position is positioned on a first side of a central line of the display area along the height direction, and the distance between the detection position and the central line is equal to one fourth of the maximum size of the display area along the height direction;
along the width direction, the detection position is located on a center line of the display area.
Optionally, the correcting the initial gamma parameter of the transmissive region according to the primary display region correction gamma parameter to obtain a transmissive region correction gamma parameter, and determining the gamma parameter of the transmissive region as the transmissive region correction gamma parameter includes:
and correcting the initial gamma parameters of the transmission region through secondary nonlinear fitting according to the correction gamma parameters of the main display region to obtain the correction gamma parameters of the transmission region, and determining the gamma parameters of the transmission region as the correction gamma parameters of the transmission region.
Optionally, the gamma correction parameter of the transmissive region is calculated by the following formula:
Y＝a(X+b)；
wherein, Y is a gamma vector representing the gamma parameter of the transmissive region, X is a gamma vector representing the gamma parameter of the main display region, and a and b are respectively preset coefficients.
In a second aspect, an embodiment of the present invention provides a device for gamma correction of panel display, where a display area of a display panel includes a transmissive area for setting an off-screen sensor and a main display area except the transmissive area, pixels in the transmissive area are electrically connected to a first reference voltage terminal, and pixels in the main display area are electrically connected to a second reference voltage terminal; the device comprises:
a control module for performing the steps of: determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area and the display brightness of the main display area; determining the gamma parameter of the main display area as a correction gamma parameter of the main display area according to the display brightness distribution of the main display area and a preset standard gamma curve; correcting the initial gamma parameter of the transmission region according to the correction gamma parameter of the main display region to obtain a correction gamma parameter of the transmission region, and determining the gamma parameter of the transmission region as the correction gamma parameter of the transmission region;
the driving module is used for driving the display panel to display;
and the detection module is used for detecting the display brightness of the display panel.
Drawings
Fig. 1 is a schematic view of a display area structure of a display panel according to an embodiment of the invention;
fig. 2 is a schematic circuit structure diagram of a driving circuit of a pixel of a display panel according to an embodiment of the invention;
FIG. 3 is a flowchart of a method for gamma correction of a panel display according to an embodiment of the present invention;
FIG. 4 is a gamma curve of the main display region and the transmissive region before adjusting the voltage provided to the first reference voltage terminal in the method for gamma correction of panel display according to the embodiment of the present invention;
FIG. 5 is a gamma curve of the main display area and the transmissive area after adjusting the voltage provided to the first reference voltage terminal in the method for gamma correction of panel display according to the embodiment of the present invention;
FIG. 6 is a flowchart of another panel display gamma correction method according to the present invention;
FIG. 7 is a block diagram of an apparatus for gamma correction of a panel display according to an embodiment of the present invention.
Wherein the reference numerals are: 11. a transmission region; 12. a main display area; 3. the position is detected.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention and are not limiting of the invention.
It is to be understood that the embodiments of the invention and the features of the embodiments can be combined with each other without conflict.
It is to be understood that, for the convenience of description, only portions related to embodiments of the present invention are shown in the drawings, and portions not related to embodiments of the present invention are not shown in the drawings.
It is to be understood that the functions and steps noted in the flowcharts and block diagrams of the embodiments of the present invention may occur out of the order noted in the figures without conflict.
It is to be understood that the flowchart and block diagrams of the embodiments of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatus, devices and methods according to various embodiments of the present invention. Each block in the flowchart or block diagrams may represent a unit, module, segment, code, which comprises executable instructions for implementing the specified function(s). Furthermore, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions or by a combination of hardware and computer instructions.
It should be understood that each unit and module related in the embodiments of the present invention may correspond to only one physical structure, may also be composed of multiple physical structures, or multiple units and modules may also be integrated into one physical structure.
It should be understood that the units and modules referred to in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.
In a first aspect, an embodiment of the invention provides a method for gamma correction of a panel display.
The embodiment of the invention is used for carrying out gamma (gamma) correction on the display panel, namely, used for determining the gamma parameter of the display panel.
Referring to fig. 1, a Display panel to which the embodiment of the present invention is applied is provided in a Display device using an off-screen sensor, for example, an off-screen Camera (FDC) technology. That is, the display panel has a display region for displaying, the display region includes a "transmissive region 11 (or FDC region)" for disposing the off-screen sensor, and the region other than the transmissive region 11 in the display region is a "main display region 12 (or Normal region)"; the transmissive region 11 is transmissive and can display light, and the main display region 12 can display light but is opaque. Thus, in the display device, the camera (sensor) may be disposed at a position corresponding to the transmissive region 11 on the back side (the side away from the light exit surface) of the display panel, and an external image may be captured through the transmissive region 11.
It should be understood that since the camera is disposed in the transmissive area 11, the entire display side of the display panel may be the display area completely, so as to achieve full-screen display.
For example, the above display device may be any product with a display function, such as a mobile phone, a tablet computer, a desktop computer, a notebook computer, a television, and the like, and will not be described in detail herein.
In the display area of the display panel according to the embodiment of the invention, a plurality of pixels (or called sub-pixels) for displaying are provided, and each pixel can display under the driving of a corresponding driving circuit. The pixel (driving circuit) needs to operate under the driving of a plurality of driving signals, one of which is a "reference voltage (Vref)" or an "initialization voltage (Vinit)", and the driving signal is provided through a reference voltage terminal Vref (or an initialization voltage terminal). That is, one position in each pixel (driver circuit) is electrically connected to the reference voltage terminal VREF.
For example, the driving circuit of the 7T1C structure shown in fig. 2 includes seven transistors (a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7) and a storage capacitor CST, and an organic light emitting diode OLED as a light emitting device, i.e., the display panel may be an Organic Light Emitting Diode (OLED) display panel.
Different positions of each transistor are electrically connected to different signal sources, such as a control signal line EM, a GATE line GATE, a data line GATE, a reset line RST, a reset voltage terminal VINT, a first voltage terminal VDD, a second voltage terminal VSS, and the like; a first pole of the fifth transistor T5 is electrically connected to the reference voltage terminal VREF.
In the above driving circuit of the 7T1C structure, the light emission luminance (i.e., the display luminance of the pixel) of the organic light emitting diode OLED is determined by the gate-source voltage Vgs of the driving transistor (i.e., the third transistor T3) therein, and Vgs can be calculated by the following formula:
Vgs＝Vdata-|Vth|-Vref；
wherein, Vdata is a data voltage provided by the data line GATE, Vth is a threshold voltage of the driving transistor, and Vref is a reference voltage provided by the reference voltage terminal Vref.
It can be seen that the display brightness of the pixel is related to the reference voltage provided by the reference voltage terminal electrically connected to the pixel, i.e., changing the reference voltage can change the display brightness of the pixel without changing other parameters.
It should be understood that the display panel of the embodiment of the present invention is not necessarily an Organic Light Emitting Diode (OLED) display panel, and the driving circuit therein is not limited to the above specific form of 7T1C, wherein the gate-source voltage (Vgs) of the driving transistor does not necessarily conform to the above specific formula.
That is, regardless of the type of the display panel and the specific form of the driving circuit, it is feasible as long as the pixel (driving circuit) thereof is electrically connected to a reference voltage terminal Vref for supplying a reference voltage (Vref), and the reference voltage can affect the display luminance of the pixel.
In the display panel of the embodiment of the invention, the transmissive region 11 and the main display region 12 are both required to display, so that pixels are disposed therein. Obviously, the pixels are usually opaque to display, and the transmissive region 11 transmits light while displaying, so that it needs to have a higher transmittance, and therefore, the pixel design in the transmissive region 11 is different from that of the main display region 12.
For example, the transmission region 11 may have a lower pixel density than the main display region 12, that is, the transmission region 11 may have a higher transmittance because the number of pixels in the transmission region 11 is smaller in the same area.
For example, the area of each pixel in the transmissive region 11 may be small, and the transmittance of the transmissive region 11 may be high.
For example, each driving circuit in the transmissive region 11 may drive a plurality of pixels (each driving circuit in the main display region 12 drives one pixel), so that the area occupied by the driving circuits (such as transistors, wirings, and the like) in the transmissive region 11 is small, and the transmittance is high.
In the display panel applicable to the embodiment of the present invention, the display area includes the transmissive area 11 for setting the under-screen sensor (such as a camera) and the main display area 12 excluding the transmissive area 11, the pixels in the transmissive area 11 are electrically connected to the first reference voltage terminal, and the pixels in the main display area 12 are electrically connected to the second reference voltage terminal.
In the embodiment of the present invention, the pixels (driving circuits) of the transmissive area 11 and the main display area 12 are respectively electrically connected to different reference voltage terminals (a first reference voltage terminal, a second reference voltage terminal), for example, each pixel of the transmissive area 11 is electrically connected to the first reference voltage terminal through a first reference voltage line; and each pixel of the main display area 12 is electrically connected to a second reference voltage terminal through a second reference voltage line, and the first reference voltage line and the second reference voltage line are insulated from each other.
The first reference voltage terminal and the second reference voltage terminal can obviously provide different reference voltages respectively and independently. Therefore, in the embodiment of the present invention, the acquired reference voltages for driving the pixels of the transmissive area 11 and the pixels of the main display area 12 may be different.
In some related arts, the pixels (driving circuits) of the transmissive area and the main display area are electrically connected to the same reference voltage terminal, for example, each pixel is finally electrically connected to one reference voltage terminal through a reference voltage line. Thus, in the related art, the reference voltages acquired by the pixels of the transmissive area and the main display area are necessarily the same and cannot be different.
It should be understood that the number of reference voltage terminals in the embodiment of the present invention is determined by whether they can provide different voltages, i.e., if multiple "ports (connectors)" are physically separated, they are one reference voltage terminal if the same voltage is necessarily provided.
Referring to fig. 3, the method for panel display gamma correction according to the embodiment of the present invention includes:
s101, determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area 11 and the display brightness of the main display area 12.
As mentioned above, since the pixel design in the transmissive area 11 is different from the pixel design in the main display area 12, the Display Brightness Values (DBV) of the two areas are different under the condition that other display parameters are the same, so that the brightness of the two areas is obviously different, which affects the display effect, especially when displaying a pure color picture.
As described above, the reference voltage can affect the display brightness of the pixels, and the pixels in the transmissive region 11 and the main display region 12 of the display panel according to the embodiment of the present invention are electrically connected to different reference voltage terminals, so that different reference voltages can be obtained; therefore, a new voltage (first correction reference voltage) to be supplied to the first reference voltage terminal, that is, the reference voltage (Vref) to be supplied to the transmissive area 11 alone can be determined so as to reduce the display luminance difference based on the luminance difference when the transmissive area 11 and the main display area 12 are displayed at the respective original reference voltages (first initial reference voltage, second initial reference voltage).
Thus, at the first calibration reference voltage, the display luminance of the transmissive region 11 can approach the display luminance of the main display region 12 (the main display region 12 is still displayed at the second initial reference voltage).
For example, the gamma curves (i.e. the display brightness at each gray level) of the transmissive region 11 and the main display region 12 at the first initial reference voltage and the second initial reference voltage can be referred to fig. 4, where the two gamma curves are greatly different; after the first initial reference voltage is adjusted to the first calibration reference voltage, the gamma curves corresponding to the transmissive region 11 and the main display region 12 can be referred to fig. 5, wherein the difference between the two gamma curves is greatly reduced.
Therefore, by adjusting the reference voltage of the transmissive region 11, the difference between the display brightness of the transmissive region 11 and the display brightness of the main display region 12 can be greatly reduced, and the display effect can be improved.
The first initial reference voltage and the second initial reference voltage are "original" reference voltages set in the transmissive area 11 and the main display area 12 before adjustment, and the values of the first initial reference voltage and the second initial reference voltage may be the same or different.
S102, according to the display brightness distribution of the main display area 12 and a preset standard gamma curve, determining the gamma parameter of the main display area 12 as a main display area correction gamma parameter.
According to the distribution of the display brightness of the main display area 12 at each gray level and a preset standard gamma curve, gamma correction (which may be conventional gamma correction including brightness detection) is performed on the main display area 12 to obtain gamma parameters of the main display area 12 (the gamma parameters for correcting the main display area, for example, are gamma values at each gray level of the binding point).
S103, correcting the initial gamma parameter of the transmission region 11 according to the main display region correction gamma parameter to obtain a transmission region correction gamma parameter, and determining the gamma parameter of the transmission region 11 as the transmission region correction gamma parameter.
After the gamma correction parameters of the main display area 12 are obtained, the initial gamma parameters of the transmissive area 11 can be adjusted according to the gamma correction parameters to obtain the adjusted gamma parameters (transmissive area correction gamma parameters) of the transmissive area 11.
Since the reference voltage of the transmission region 11 has only "one value", referring to FIG. 5, adjusting the reference voltage of the transmission region 11 can make the gamma curves of the two regions close to each other, but may not make the gamma curve of the transmission region 11 completely fit to the standard gamma curve. Therefore, after the gamma correction parameter of the main display area is calculated, the gamma parameter of the transmissive area 11 can be "fine-tuned" according to the gamma correction parameter, so as to further improve the display effect of the transmissive area 11.
It should be understood that this step is a "calculation" process based on the main display region correction gamma parameter, the initial gamma parameter of the transmissive region 11, without actually measuring the display brightness of the transmissive region 11, and therefore takes a short time compared to the conventional gamma correction process.
It should be understood that after the first calibration reference voltage, the gamma parameter for main display area calibration, and the gamma parameter for transmission area calibration are obtained, they can also be written (burned) into the driving chip of the display panel, so that the display panel can subsequently operate according to the corresponding display parameters.
It should be understood that the above numbering and description sequence of the steps S101 and S102 do not represent the necessary execution sequence of the two steps, that is, the first correction reference voltage, the transmission region correction gamma parameter, or both parameters may be determined first in the embodiment of the present invention.
In the embodiment of the invention, the gamma correction is carried out on the main display area 12 of the display panel, so that the display brightness of the main display area 12 is ensured to accord with a standard gamma curve; meanwhile, the reference voltage adjustment and the gamma parameter adjustment are carried out on the transmission area 11, so that the display brightness of the display panel can be ensured to basically accord with a standard gamma curve (the transmission area 11 is small in area, and the influence on the whole display effect is small even if a slight difference exists), the display brightness of the two areas of the display panel is close, and the display effect is fully improved.
On the other hand, in the embodiment of the present invention, the gamma correction that requires brightness detection is performed only once, and the adjustment of the transmission region 11 is completed by simple calculation and parameter setting, which hardly consumes Time, so that Tact Time (beat Time) for correction is short, and the production efficiency is high.
Alternatively, referring to fig. 6, determining the voltage supplied to the first reference voltage terminal as the first correction reference voltage (S101) according to the difference between the display luminance of the transmissive area 11 and the display luminance of the main display area 12 includes:
s1011, providing a first initial reference voltage to the first reference voltage terminal, providing a second initial reference voltage to the second reference voltage terminal, so that both the transmissive region 11 and the main display region 12 display standard gray scales, measuring the display brightness of the transmissive region 11 and the display brightness of the main display region 12, and determining a standard difference between the display brightness of the transmissive region 11 and the display brightness of the main display region 12.
S1012, determining the voltage provided to the first reference voltage terminal as the first corrected reference voltage according to the standard deviation value.
The first calibration reference voltage is used to make the display brightness of the transmissive area 11 and the main display area 12 close, so it should be determined according to the difference between the "original" display brightness of the transmissive area 11 and the main display area 12.
Therefore, as a way of the embodiment of the present invention, under the initial condition (i.e. under the condition that the transmissive area 11 adopts the first initial reference voltage and the main display area 12 adopts the second initial reference voltage), the transmissive area 11 and the main display area 12 both display a determined standard gray scale, and measure the difference (standard difference) between the actual display brightness of the two areas under the standard gray scale, so as to adjust the reference voltage of the transmissive area 11 according to the standard difference, and obtain the reasonable first calibration reference voltage.
For example, the adjustment direction (increase or decrease) and the adjustment amount of the reference voltage of the transmission region 11 may be determined based on the standard deviation value; then, correspondingly adjusting the first initial reference voltage (certainly, both areas still display the standard gray scale, and the main display area 12 still adopts the second initial reference voltage); then, the brightness difference between the two regions is determined again, and the reference voltage of the transmission region 11 is adjusted again according to the new brightness difference; the above steps are repeated until the brightness difference between the two regions reaches the preset range, and the reference voltage of the current transmission region 11 is used as the first initial reference voltage.
For another example, the accurate adjustment amount may be directly calculated according to a predetermined calculation formula (e.g., a theoretical formula) based on the standard deviation, and the first calibration reference voltage is obtained by correspondingly adjusting the reference voltage of the transmission region 11.
Optionally, determining the voltage provided to the first reference voltage terminal as the first correction reference voltage according to the difference between the display brightness of the transmissive area 11 and the display brightness of the main display area 12 (S101) includes:
and S1013, determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the standard difference value acquired in advance.
The standard deviation value is a difference value between the display brightness of the transmissive region 11 and the display brightness of the main display region 12 when the first initial reference voltage is provided to the first reference voltage terminal, the second initial reference voltage is provided to the second reference voltage terminal, and the transmissive region 11 and the main display region 12 both display the standard gray scale.
The influence of the reference voltage on their display effect is substantially the same for a plurality of display panels of the same model, i.e. they are substantially similar in the difference (standard deviation) of the display luminance between the transmissive area 11 and the main display area 12 in the initial condition (when the transmissive area 11 uses a first initial reference voltage and the main display area 12 uses a second initial reference voltage), and correspondingly, the reference voltage (first correction reference voltage) required for their transmissive area 11 is also similar.
Therefore, as another mode of the embodiment of the present invention, a standard deviation value of a first display panel of a certain model of display panels may be obtained in advance (for example, the above mode of step S1011 is adopted); accordingly, the first calibration reference voltages of the other display panels of the model may be determined according to the pre-acquired standard deviation value.
For example, the other display panels may directly use the first correction reference voltage of the first display panel (so that the first correction reference voltages of the other display panels are still derived from the "pre-acquired standard deviation").
Therefore, for a certain type of display panel, except for the first display panel, the first correction reference voltages of other types of display panels can be directly set according to the known standard difference value without carrying out actual operations such as display brightness acquisition and the like, so that the efficiency of the correction process can be further improved.
Optionally, the standard gray scale is a gray scale that makes the display brightness of the main display area 12 closest to the preset standard brightness when the second initial reference voltage is provided to the second reference voltage terminal.
As a manner of the embodiment of the present invention, the "standard gray scale" is a gray scale that makes the display brightness of the main display area 12 closest to the preset standard brightness.
The standard brightness is preset, and is, for example, a brightness value (Lmax) specified by a client; accordingly, the second initial reference voltage is provided to the main display area 12, and the display luminance values of the main display area under a plurality of gray scales are detected, and the gray scale corresponding to the luminance value closest to the Lmax luminance value is selected as the standard gray scale.
Of course, the selection of the standard gray level is not limited to this, and may be the maximum gray level, or the median gray level, for example.
Optionally, referring to fig. 6, determining the gamma parameter of the main display area 12 as the main display area correction gamma parameter according to the display brightness distribution of the main display area 12 and a preset standard gamma curve (S102) includes:
and S1021, displaying a preset binding gray scale on the main display area 12, and detecting the binding gray scale brightness of the detection position 3 of the main display area 12.
S1022, determining the gamma value of the main display area 12 at the binding point gray scale according to the difference between the binding point gray scale brightness and the brightness of the standard gamma curve at the corresponding binding point gray scale.
Each display panel usually has a part of specific gray scale capable of setting gamma value, and such gray scale is called binding point gray scale; the gamma value settings for any two adjacent binding gray levels can affect the display brightness of each gray level during the period. For example, for a display panel having 256 gray levels, 14 binding gray levels may be predetermined.
The standard gamma curve is a preset display brightness value curve (DBV curve) that the display panel should have, that is, the standard gamma curve specifies the brightness that the display panel should have for each gray level.
As a manner of the embodiment of the present invention, when performing gamma correction on the main display area 12, the main display area 12 may be respectively caused to display (at the second initial reference voltage) each binding point gray scale, and when displaying each binding point gray scale, the display brightness (binding point gray scale brightness) of the main display area 12 is actually acquired by a luminance meter or the like, and a gamma value under the binding point gray scale is set according to a difference between the binding point gray scale brightness and the brightness specified by the standard gamma curve at the corresponding binding point gray scale; and the sum of the gamma values under all the binding point gray levels forms the correction gamma parameter of the main display area.
Optionally, the detection position 3 is located between the geometric center of the display area and the transmissive area 11.
Optionally, the display area has a height direction and a width direction perpendicular to each other; along the height direction, the transmission area 11 is positioned on the first side of the central line of the display area; along the height direction, the detection position 3 is positioned on the first side of the central line of the display area, and the distance between the detection position and the central line is equal to one fourth of the maximum size of the display area along the height direction; the detection position 3 is located on the center line of the display area in the width direction.
As one mode of the embodiment of the present invention, referring to fig. 1, when the display brightness of the main display area 12 is collected, the detection position 3 (e.g. the position where the brightness meter is aligned) may be located between the geometric center of the display area and the transmissive area 11. Further, the method can be as follows: the detection position 3 is located on the middle line of the display area in the width direction, and on the same side of the middle line as the transmissive area 11 in the height direction, and is spaced apart from the middle line by a distance equal to one quarter (h/4) of the height (h) of the display area.
Obviously, due to the wire voltage drop and the like, the display brightness at different positions in the main display area 12 actually has slight differences under the same display parameters, and the geometric center of the display area should be taken as the detection position from the viewpoint of ensuring that the overall display brightness of the main display area 12 is closest to the standard gamma curve and improving the uniformity.
However, in the embodiment of the present invention, the gamma parameter of the transmissive area 11 is set according to the main display area correction gamma parameter, so the closer the sampling point determined by the main display area correction gamma parameter is to the transmissive area 11, the more the gamma parameter of the transmissive area 11 set according to the sampling point meets the requirement.
Therefore, the embodiment of the invention does not use the geometric center of the display area as the detection position as in some related arts, but sets the detection position between the geometric center of the display area and the transmissive area 11, thereby achieving the adjustment effect in both aspects.
Optionally, referring to fig. 6, the correcting the initial gamma parameter of the transmissive region 11 according to the main display region correction gamma parameter to obtain a transmissive region correction gamma parameter, and the determining the gamma parameter of the transmissive region 11 as the transmissive region correction gamma parameter (S103) includes:
and S1031, correcting the initial gamma parameters of the transmission region 11 through secondary nonlinear fitting according to the correction gamma parameters of the main display region to obtain the transmission region correction gamma parameters, and determining the gamma parameters of the transmission region 11 as the transmission region correction gamma parameters.
Optionally, the transmission region correction gamma parameter is calculated by the following formula:
Y＝a(X+b)；
wherein, Y is a gamma vector representing the gamma parameter for the transmissive region correction, X is a gamma vector representing the gamma parameter for the main display region correction, and a and b are respectively preset coefficients.
As a manner of the embodiment of the present invention, a second non-linear fitting may be performed on the initial gamma parameter originally set in the transmission region 11 according to the known transmission region correction gamma parameter to obtain the transmission region correction gamma parameter.
Further, the primary display correction gamma parameter is expressed in the form of a gamma vector X (X1, X2 … xn), where each X represents the gamma value of one binding gray level in the primary display 12. Thus, a gamma vector Y (Y1, Y2 … yn) representing the pass-through correction gamma parameters can be calculated by the formula Y ═ a (X + b), where each Y represents the gamma value of one binding gray level in the pass-through 11.
Wherein, a is the adjustment factor corresponding to the overall brightness difference between the transmissive area 11 and the main display area 12, and b is the adjustment factor corresponding to the brightness difference of the gray scale of each point, which are preset empirical values or statistical values.
For example, the actual display brightness of a plurality of display panels of the same model may be counted, and a and b may be calculated by a statistical calculation method such as a least square method. Wherein, for example, the value range of a is usually between 0.8 and 1.2, and further between 0.9 and 1.1; the value range of b (taking the maximum gamma value of 4096 as an example) is usually between-15 and 15, and further between-10 and 10.
In a second aspect, an embodiment of the present invention provides a device for gamma correction of a panel display.
The display area of the display panel applicable to the device for panel display gamma correction comprises a transmission area for arranging the under-screen sensor and a main display area except the transmission area, wherein pixels in the transmission area are electrically connected with a first reference voltage end, and pixels in the main display area are electrically connected with a second reference voltage end.
Referring to fig. 7, the apparatus for panel display gamma correction according to the embodiment of the present invention includes:
a control module for performing the steps of: determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area and the display brightness of the main display area; determining the gamma parameter of the main display area as a correction gamma parameter of the main display area according to the display brightness distribution of the main display area and a preset standard gamma curve; correcting the initial gamma parameter of the transmission region according to the correction gamma parameter of the main display region to obtain a correction gamma parameter of the transmission region, and determining the gamma parameter of the transmission region as the correction gamma parameter of the transmission region;
the driving module is used for driving the display panel to display;
and the detection module is used for detecting the display brightness of the display panel.
The panel display gamma correction device is used for realizing the panel display gamma correction method, and comprises a driving module and a detection module, wherein the driving module is used for controlling a display panel to display according to a required mode; the modules can realize the method for gamma correction of the panel display under the control of the control module.
It should be understood that the above control module may also specifically execute any step in the above method of panel display gamma correction.
It should be understood that the panel display gamma correction apparatus according to the embodiment of the invention may further include other structures, for example, a programming module for writing the determined first correction reference voltage, the main display area correction gamma parameter, and the transmissive area correction gamma parameter into the display panel.
It will be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. The gamma correction method for panel display is characterized in that a display area of the display panel comprises a transmission area for arranging an off-screen sensor and a main display area except the transmission area, pixels in the transmission area are electrically connected with a first reference voltage end, and pixels in the main display area are electrically connected with a second reference voltage end; the method comprises the following steps:
determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area and the display brightness of the main display area;
determining the gamma parameter of the main display area as a correction gamma parameter of the main display area according to the display brightness distribution of the main display area and a preset standard gamma curve;
and correcting the initial gamma parameter of the transmission region according to the correction gamma parameter of the main display region to obtain a transmission region correction gamma parameter, and determining the gamma parameter of the transmission region as the transmission region correction gamma parameter.
2. The method of claim 1, wherein determining the voltage provided to the first reference voltage terminal as the first calibration reference voltage according to the difference between the display brightness of the transmissive area and the display brightness of the main display area comprises:
determining the voltage provided for the first reference voltage end as a first correction reference voltage according to a pre-obtained standard difference value;
the standard difference value is a difference value between the display brightness of the transmission area and the display brightness of the main display area when a first initial reference voltage is provided to the first reference voltage end, a second initial reference voltage is provided to the second reference voltage end, and the transmission area and the main display area both display standard gray scales.
3. The method of claim 1, wherein determining the voltage provided to the first reference voltage terminal as the first calibration reference voltage according to the difference between the display brightness of the transmissive area and the display brightness of the main display area comprises:
providing a first initial reference voltage to the first reference voltage end, providing a second initial reference voltage to the second reference voltage end, enabling the transmission area and the main display area to display standard gray scales, measuring the display brightness of the transmission area and the display brightness of the main display area, and determining a standard difference value between the display brightness of the transmission area and the display brightness of the main display area;
and determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the standard deviation value.
4. The method according to claim 2 or 3,
the standard gray scale is a gray scale which enables the display brightness of the main display area to be closest to the preset standard brightness when a second initial reference voltage is provided for a second reference voltage end.
5. The method of claim 1, wherein the determining the gamma parameter of the main display area as the main display area correction gamma parameter according to the display brightness distribution of the main display area and a preset standard gamma curve comprises:
displaying a preset binding point gray scale in the main display area, and detecting the binding point gray scale brightness of the detection position of the main display area;
and determining the gamma value of the main display area under the binding point gray scale according to the difference value between the binding point gray scale brightness and the brightness of the standard gamma curve under the corresponding binding point gray scale.
6. The method of claim 5,
the detection position is located between the geometric center of the display area and the transmission area.
7. The method of claim 6,
the display area has a height direction and a width direction which are perpendicular to each other;
along the height direction, the transmission area is positioned on a first side of the central line of the display area;
the detection position is positioned on a first side of a central line of the display area along the height direction, and the distance between the detection position and the central line is equal to one fourth of the maximum size of the display area along the height direction;
along the width direction, the detection position is located on a center line of the display area.
8. The method of claim 1, wherein the correcting the initial gamma parameter of the transmissive region according to the main display region correction gamma parameter to obtain a transmissive region correction gamma parameter, and the determining the gamma parameter of the transmissive region as the transmissive region correction gamma parameter comprises:
and correcting the initial gamma parameters of the transmission region through secondary nonlinear fitting according to the correction gamma parameters of the main display region to obtain the correction gamma parameters of the transmission region, and determining the gamma parameters of the transmission region as the correction gamma parameters of the transmission region.
9. The method of claim 8, wherein the transillumination gamma correction parameter is calculated by the following equation:
Y＝a(X+b)；
wherein, Y is a gamma vector representing the gamma parameter for the transmissive region correction, X is a gamma vector representing the gamma parameter for the main display region correction, and a and b are respectively preset coefficients.
10. The device for gamma correction of panel display is characterized in that a display area of the display panel comprises a transmission area for arranging an off-screen sensor and a main display area except the transmission area, pixels in the transmission area are electrically connected with a first reference voltage end, and pixels in the main display area are electrically connected with a second reference voltage end; the device comprises:
a control module for performing the steps of: determining the voltage provided to the first reference voltage end as a first correction reference voltage according to the difference value between the display brightness of the transmission area and the display brightness of the main display area; determining the gamma parameter of the main display area as a correction gamma parameter of the main display area according to the display brightness distribution of the main display area and a preset standard gamma curve; correcting the initial gamma parameter of the transmission region according to the correction gamma parameter of the main display region to obtain a correction gamma parameter of the transmission region, and determining the gamma parameter of the transmission region as the correction gamma parameter of the transmission region;
the driving module is used for driving the display panel to display;
and the detection module is used for detecting the display brightness of the display panel.
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