CN110910826A - Brightness compensation method and device of display panel and display module - Google Patents
Brightness compensation method and device of display panel and display module Download PDFInfo
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- CN110910826A CN110910826A CN201911315750.7A CN201911315750A CN110910826A CN 110910826 A CN110910826 A CN 110910826A CN 201911315750 A CN201911315750 A CN 201911315750A CN 110910826 A CN110910826 A CN 110910826A
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The invention discloses a brightness compensation method, a brightness compensation device and a display module of a display panel. The brightness compensation method comprises the following steps: calculating a brightness attenuation value of the first display area according to the equivalent working time of the first display area; calculating the gray scale variable quantity of the first display area according to the brightness attenuation value; and according to the gray scale variable quantity, carrying out inverse proportion amplification on the input voltage of the first display area by using the feedback circuit so as to reach a preset voltage value. According to the method, the brightness attenuation value is calculated according to the equivalent working time of the first display area, the gray scale variation is calculated according to the brightness attenuation value, the feedback circuit is used for carrying out inverse proportion amplification on the input voltage of the first display area, the voltage input quantity is increased, and the purpose of increasing the luminous current of the first display area is achieved, so that the brightness of the first display area is compensated and is kept consistent with the brightness of the second display area.
Description
Technical Field
The invention relates to the technical field of display, in particular to a brightness compensation method, a brightness compensation device and a display module of a display panel.
Background
With the increasing development of the Organic Light-Emitting Diode (OLED) display industry, more and more foldable flexible devices (such as mobile phones, tablet computers, etc.) are widely used in daily life. At present, a whole screen is mostly divided into two screens by a foldable flexible screen through a rotating shaft, and the working form of inward folding and outward folding is formed, so that the two screens can be displayed in a coordinated mode and can also be displayed independently. Typically, the foldable flexible screen is in a folded state such that one screen is in an operational state and the other screen is in a dormant state. However, due to the characteristics of the OLED device and the light emitting material, the light emitting efficiency will be reduced as the light emitting time increases, which may cause the problem that the luminance of the screen in a long-term operation state is reduced in advance, so that the luminance of the two screens is not uniform.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, the present invention provides a brightness compensation method, a brightness compensation device and a display module for a display panel, so as to solve the problem that the brightness of two screens is inconsistent due to long-time operation of a foldable flexible screen.
A first aspect of the present invention provides a brightness compensation method for a display panel, the display panel including at least two display regions, a first display region of the at least two display regions being connected to a feedback circuit, the method comprising:
calculating a brightness attenuation value of the first display area according to the equivalent working time of the first display area;
calculating the gray scale variable quantity of the first display area according to the brightness attenuation value;
and according to the gray scale variable quantity, carrying out inverse proportion amplification on the input voltage of the first display area by using the feedback circuit so as to achieve a preset voltage value.
Further, the calculating the brightness attenuation value of the first display region according to the equivalent working time of the first display region includes:
acquiring the accumulated working time and the current brightness value of the first display area;
calculating the equivalent working time according to the accumulated working time, the current brightness value and a preset brightness value;
and calculating the brightness attenuation value according to the equivalent working time and the current brightness value.
Further, the equivalent operating time is calculated by the following formula:
wherein, TARepresents the equivalent operating time, LARepresenting said current luminance value, TSRepresents the cumulative operating time, L0Representing the preset luminance value.
Further, the brightness attenuation value is calculated by the following formula:
where α denotes the brightness attenuation value, n denotes an acceleration factor, and C and β denote constant coefficients.
Further, the gray-scale variation amount is calculated by the following formula:
wherein | Δ Gray | represents the Gray scale variation amount, Gray_inAn input gray level representing said first display area, α0Represents a preset compensation value, α represents the brightness attenuation value, and gamma represents the gamma coefficient of the display panel.
Furthermore, the feedback circuit is an inverse proportion amplifying circuit and comprises a feedback resistor, the feedback resistor is adjustable,
wherein, according to the gray scale variation, the inverse proportion amplification is performed on the input voltage of the first display area by using the feedback circuit so as to reach a preset voltage value, and the method comprises the following steps:
converting the gray scale variable quantity into a voltage variable quantity according to a gray scale-voltage curve;
and according to the voltage variation, realizing inverse proportion amplification of the input voltage by adjusting the resistance value of the feedback resistor.
Furthermore, the inverse proportion amplifying circuit further comprises an operational amplifier, a first resistor and a second resistor, wherein the inverse input end of the operational amplifier is electrically connected with the voltage supply end of the display panel through the first resistor, the homodromous input end of the operational amplifier is grounded through the second resistor, the output end of the operational amplifier is electrically connected with the first display area and is used for outputting the amplified voltage to the first display area, two ends of the feedback resistor are respectively electrically connected with the inverse input end and the output end of the operational amplifier,
wherein the resistance value of the feedback resistor is adjusted by the following formula:
wherein R isfRepresenting the resistance, R, of the feedback resistor1Represents the resistance value of the first resistor, | Δ V | represents the voltage variation, VinRepresents the input voltage provided by the voltage providing terminal for the display panel.
A second aspect of the present invention provides a luminance compensation apparatus, the display panel including at least two display regions, the apparatus comprising a microprocessor and a feedback circuit, the feedback circuit being connected to a first display region of the at least two display regions, the microprocessor being configured to:
calculating a brightness attenuation value of the first display area according to the equivalent working time of the first display area;
calculating the gray scale variable quantity of the first display area according to the brightness attenuation value;
and according to the gray scale variable quantity, carrying out inverse proportion amplification on the input voltage of the first display area by using the feedback circuit so as to achieve a preset voltage value.
Further, the feedback circuit is an inverse proportion amplifying circuit and comprises a feedback resistor, an operational amplifier, a first resistor and a second resistor, the reverse input end of the operational amplifier is electrically connected with the voltage supply end of the display panel through the first resistor, the same-direction input end of the operational amplifier is grounded through the second resistor, the output end of the operational amplifier is electrically connected with the first display area and used for outputting the amplified voltage to the first display area, and two ends of the feedback resistor are respectively electrically connected with the reverse input end and the output end of the operational amplifier.
A third aspect of the present invention provides a display module, which includes a display panel, wherein the display panel includes at least two display regions, and the module further includes a power module and the brightness compensation device of the display panel.
The brightness compensation method of the display panel provided by the embodiment of the invention adds the design of the feedback circuit for the display panel, and the feedback circuit is connected with the first display area which is always in a working state. The method comprises the steps of firstly calculating a brightness attenuation value of a first display area according to the equivalent working time of the first display area, calculating a gray scale variable quantity according to the brightness attenuation value, then carrying out inverse proportion amplification on the input voltage of the first display area by using a feedback circuit according to the gray scale variable quantity, namely completing inverse proportion adjustment on the input voltage of the first display area through the feedback circuit, increasing the voltage input quantity, and achieving the purpose of increasing the luminous current of the first display area, so that the brightness of the first display area is compensated and is kept consistent with the brightness of a second display area.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flowchart illustrating a method for compensating brightness of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a step 101 of a brightness compensation method for a display panel according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a connection between a feedback circuit and a first display region according to an embodiment of the invention;
fig. 5 is a schematic diagram illustrating a digital potentiometer according to an embodiment of the invention connected to a microprocessor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present invention. Specifically, the display panel may be a foldable flexible display panel, and includes at least two display regions, and the shape and area of each display region may be set differently according to specific situations, which is not limited in the present invention. In addition, the number of the display regions is not particularly limited in the present invention, and for example, two or more display regions may be included.
Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 2, the display panel 1 in the display device includes two display regions, i.e., a first display region 11 and a second display region 12. Specifically, the first display area 11 and the second display area 12 may be two screens of the display panel 1, respectively, wherein the first display area 11 is a screen that is always in an operating state, and is connected to the feedback circuit 3, and the second display area 12 is in a sleep state. Meanwhile, the feedback Circuit 3 is further connected to the microprocessor 4 and a Driver IC (Driver IC)5, respectively, and the Driver IC 5 and a Flexible Printed Circuit (FPC) 7 are connected to a Power IC 6. The power chip 6 provides voltage output for the display panel 1, and the driving chip 5 is used for driving and controlling the magnitude of the output voltage of the power chip 6. That is, the light emission of the two screens is driven by the power supply chip 6 in common with the driving chip 5.
As shown in fig. 1, the method for compensating brightness of a display panel according to an embodiment of the present invention includes the following steps:
step 101: calculating a brightness attenuation value of the first display area according to the equivalent working time of the first display area;
step 102: calculating the gray scale variable quantity of the first display area according to the brightness attenuation value;
step 103: and according to the gray scale variable quantity, carrying out inverse proportion amplification on the input voltage of the first display area by using the feedback circuit so as to reach a preset voltage value.
The brightness compensation method of the display panel provided by the embodiment of the invention adds the design of the feedback circuit for the display panel, and the feedback circuit is connected with the first display area which is always in a working state. The method comprises the steps of firstly calculating a brightness attenuation value of a first display area according to the equivalent working time of the first display area, calculating a gray scale variable quantity according to the brightness attenuation value, then carrying out inverse proportion amplification on the input voltage of the first display area by using a feedback circuit according to the gray scale variable quantity, namely completing inverse proportion adjustment on the input voltage of the first display area through the feedback circuit, increasing the voltage input quantity, and achieving the purpose of increasing the luminous current of the first display area, so that the brightness of the first display area is compensated and is kept consistent with the brightness of a second display area.
In an embodiment of the present invention, as shown in fig. 3, step 101 specifically includes the following steps:
step 1011: and acquiring the accumulated working time and the current brightness value of the first display area.
Specifically, the accumulated operating time represents the total operating time of the first display region 11 after the display panel 1 is shipped from the factory, and the accumulated operating time can be acquired by the internal clock record of the microprocessor 4. The current brightness value represents the current display brightness of the first display region 11, which may be retrieved by a register in the microprocessor 4.
Step 1012: and calculating the equivalent working time according to the accumulated working time, the current brightness value and the preset brightness value.
In one specific embodiment, the equivalent operating time may be calculated by the following equation:
wherein, TADenotes the equivalent operating time, LARepresenting the current brightness value, TSRepresents the cumulative operating time, L0Representing a preset luminance value.
L0Which represents a standard brightness value preset at the time of factory shipment of the display panel 1. It will be appreciated that in actual operation, due to the nature of the OLED device and the light-emitting material, the luminous efficiency thereof will decay, which causes the display luminance of the first display region 11 to gradually decrease as the operating time accumulates. The accumulated working time T can be calculated by using the formulaSEquivalently, the first display region 11 is displayed with an average brightnessThe working time of (c).
Step 1013: and calculating a brightness attenuation value according to the equivalent working time and the current brightness value.
In one specific embodiment, the brightness attenuation value may be calculated by the following formula:
where α denotes a luminance attenuation value, n denotes an acceleration factor, and C and β denote constant coefficients, which are determined by specific characteristics of the display panel 1.
In this embodiment, the accumulated working time and the current brightness value of the first display region 11 may be obtained by the microprocessor 4, and the equivalent working time may be calculated according to the accumulated working time and the current brightness value, so as to obtain the brightness attenuation value of the first display region 11.
In an embodiment of the invention, after obtaining the luminance attenuation value α, the gray-scale variation of the first display region 11 can be calculated by the following formula:
wherein, | Δ Gray | represents Gray scale variation amount, Gray_inIndicating the input gray level of the first display area 11, α0Representing a preset compensation value and gamma representing the gamma coefficient of the display panel 1, wherein α0It is determined when the display panel 1 is shipped, and it is determined by the material and manufacturing process of the OLED.
It will be appreciated that a reduction in the luminous efficiency of the OLED device and the light-emitting material will result in an input Gray scale value Gray for the first display region 11_inAnd output Gray scale value Gray_outA difference value is generated between the Gray scale values, and in the present embodiment, the difference value | Δ Gray | is obtained by inputting the Gray scale value Gray_inPreset compensation value α0And a brightness attenuation value α.
Then, the Gray scale variation | Δ Gray | is converted into a voltage variation | Δ V | according to the Gray scale-voltage curve.
Fig. 4 is a schematic diagram illustrating a connection between a feedback circuit and a first display region according to an embodiment of the invention. As shown in fig. 4, in the present embodiment, the feedback circuit 3 is an inverse proportion amplifying circuit, and includes a feedback resistor 31, a first resistor 32, a second resistor 33, and an operational amplifier 34. An inverting input terminal ("-") of the operational amplifier 34 is electrically connected to the voltage supply terminal of the display panel 1 through the first resistor 32, a homonymous input terminal ("+" terminal) of the operational amplifier 34 is grounded through the second resistor 33, and an output terminal of the operational amplifier 34 is electrically connected to the first display region 11 for outputting the amplified voltage to the first display region 11. The feedback resistor 31 is adjustable, and may be an adjustable varistor, and two ends of the adjustable varistor are electrically connected to the inverting input terminal and the output terminal of the operational amplifier 34, respectively.
Here, the output voltage V of the feedback circuit 3out(i.e. the voltage amplified and compensated by the feedback circuit 3) can be obtained by the following formula according to the inverse proportion operation of the feedback circuit:
wherein R isfRepresents the resistance value, R, of the feedback resistor 311Represents the resistance value, V, of the first resistor 32inRepresents the input voltage provided by the voltage providing terminal for the display panel 1, the input voltage is generally the data voltage, and can be represented as Vdata。
Further, the pixel current amplified and compensated by the feedback circuit 3 can be based on the output voltage VoutAnd a data voltage VdataObtained by the following formula:
IOLED＝K×(Vout-Vdata)2，
wherein, IOLEDThe pixel current (i.e., the input current of the first display region 11) after the amplification and compensation by the feedback circuit 3 is shown, and K is a coefficient of the light emitting element in the display panel 1.
From the above two equations, the following equation can be obtained:
it can be understood that to increase the luminance of the first display region 11, I needs to be increasedOLEDThe input amount of (2). As can be seen from the above formula, due to the K value and R1The value is fixed and the data voltage V is supplied to the first display region 11 and the second display region 12dataAlso, for the first display region 11 to which the feedback circuit 3 is added, by increasing the resistance value R of the feedback resistor 31fThe input current to the first display region 11 can be increased to improve the luminance.
Therefore, after obtaining the voltage variation | Δ V | (i.e. the voltage to be compensated), the voltage compensation can be performed on the first display area 11 by adjusting the resistance of the feedback resistor 31, so that the input voltage of the first display area 11 reaches the preset value Vdata+ | Δ V |, i.e., let Vout＝Vdata+ | Δ V |. Specifically, the resistance value of the feedback resistor 31 can be calculated by the following formula:
the resistance value R of the feedback resistor 31 will be described in detailfDetermination of (1):
by the formula
The following formula can be obtained:
which is related to formula Vout＝VdataThe + | Δ V | can be combined to give the formula:
it can be seen that the resistance value R of the first resistor 32 is reduced1And a data voltage VdataIs fixed, the resistance R of the feedback resistor 31fIs related to the voltage variation | Δ V |, so it is slightThe controller 4 may control the resistance value R of the feedback resistor 31 in the feedback circuit 3 by the calculated voltage variation | Δ V |fSo that the voltage of the first display region 11 is increased by the input amount | Δ V |, and the light emitting current of the screen is increased, so that the brightness is compensated.
As the feedback resistor 31, it may be specifically a sliding rheostat or a digital potentiometer. In one embodiment, the feedback resistor 31 is a digital potentiometer, which has higher precision and can automatically adjust the resistance value through the microcontroller 4. The digital potentiometer may be a digital potentiometer such as a model X9313 or a MAX5438, which is not limited in the present invention.
Taking model X9313 digital potentiometer as an example, as shown in FIG. 5, VHAnd VLRespectively representing a high voltage terminal and a low voltage terminal, VWIndicating sliding end, VCCRepresenting the supply voltage, VSSGround, INC for the "increase" input pin, U/D for the up/down input pin, and CS for the chip select input. INC, U/D and CS are respectively connected with I/O interface of microprocessor 4, so that slide port V can be controlled by microprocessor 4WThereby to the resistance R of the digital potentiometerfReal-time adjustment is performed to achieve voltage compensation for the first display region 11.
The brightness compensation method provided by the embodiment of the invention adopts the design of a digital potentiometer for the feedback resistor in the feedback circuit, monitors the brightness attenuation condition of the first display area in real time through the microprocessor, calculates the corresponding voltage quantity to be compensated according to the brightness attenuation condition, and sends a control instruction to the resistance value R of the digital potentiometer according to the voltage quantity to be compensatedfAnd the real-time adjustment is carried out, so that the brightness compensation of the first display area is realized, and the precision is improved. In addition, the digital potentiometer realizes the adjustment of the input voltage under the condition of not changing the working state of the power supply chip, and ensures the working stability of the system power supply.
The embodiment of the invention also provides a brightness compensation device of the display panel, and the display panel comprises at least two display areas. In one embodiment, as shown in fig. 2, the display panel 1 includes a first display area 11 and a second display area 12, which may be two screens of the display panel 1 respectively, wherein the first display area 1 is a screen in a frequently-operating state, and the second display area 12 is a screen in a sleep-mode.
The brightness compensation device in this embodiment includes a microprocessor 4 and a feedback circuit 3, and the feedback circuit 3 is connected to the first display region 11. The microprocessor 4 is configured to calculate a brightness attenuation value of the first display region 11 according to the equivalent operating time of the first display region 11, calculate a gray scale variation of the first display region 11 according to the brightness attenuation value, and perform inverse proportion amplification on the input voltage of the first display region 11 by using the feedback circuit 3 according to the gray scale variation to reach a preset voltage value.
The brightness compensation device of the display panel provided by the embodiment of the invention comprises a microprocessor and a feedback circuit, wherein the feedback circuit is connected with the first display area which is always in a working state. The microprocessor firstly calculates the brightness attenuation value of the first display area according to the equivalent working time of the first display area, calculates the gray scale variation according to the brightness attenuation value, and then performs inverse proportion amplification on the input voltage of the first display area by using the feedback circuit according to the gray scale variation, namely, the inverse proportion adjustment of the input voltage of the first display area is completed through the feedback circuit, so that the voltage input quantity is increased, the purpose of increasing the luminous current of the first display area is achieved, and the brightness of the first display area is compensated and kept consistent with the brightness of the second display area.
In an embodiment of the present invention, as shown in fig. 4, the feedback circuit 3 is an inverse proportion amplifying circuit, and includes a feedback resistor 31, a first resistor 32, a second resistor 33, and an operational amplifier 34. An inverting input terminal ("-") of the operational amplifier 34 is electrically connected to the voltage supply terminal of the display panel 1 through the first resistor 32, a homonymous input terminal ("+" terminal) of the operational amplifier 34 is grounded through the second resistor 33, and an output terminal of the operational amplifier 34 is electrically connected to the first display region 11 for outputting the amplified voltage to the first display region 11. The feedback resistor 31 is adjustable, and may be an adjustable varistor, and two ends of the adjustable varistor are electrically connected to the inverting input terminal and the output terminal of the operational amplifier 34, respectively.
In one embodiment, the microprocessor 4 first obtains the accumulated operating time and the current brightness value of the first display region 11, calculates the equivalent operating time according to the accumulated operating time, the current brightness value and the preset brightness value, and then calculates the brightness attenuation value according to the equivalent operating time and the current brightness value.
Specifically, the equivalent operating time can be calculated by the following formula:
wherein, TADenotes the equivalent operating time, LARepresenting the current brightness value, TSRepresents the cumulative operating time, L0Representing a preset luminance value.
The brightness attenuation value can be calculated by the following formula:
where α denotes a luminance attenuation value, n denotes an acceleration factor, and C and β denote constant coefficients, which are determined by specific characteristics of the display panel 1.
In this embodiment, the microprocessor 4 first obtains the accumulated operating time and the current brightness value of the first display region 11, and then calculates the equivalent operating time according to the accumulated operating time and the current brightness value, thereby obtaining the brightness attenuation value of the first display region 11.
In an embodiment of the present invention, after obtaining the luminance attenuation value α, the microprocessor 4 can calculate the gray-scale variation by the following formula:
wherein, | Δ Gray | represents Gray scale variation amount, Gray_inIndicating the input gray level of the first display area 11, α0Denotes a preset compensation value, and gamma denotes gamma of the display panel 1Coefficient of which α0It is determined when the display panel 1 is shipped, and it is determined by the material and manufacturing process of the OLED.
Next, the microprocessor 4 converts the Gray scale variation | Δ Gray | into a voltage variation | Δ V | according to the Gray scale-voltage curve.
After obtaining the voltage variation | Δ V | (i.e. the voltage to be compensated), the voltage compensation may be performed on the first display region 11 by adjusting the resistance of the feedback resistor 31, so that the input voltage of the first display region 11 reaches the preset value Vdata+ | Δ V |, i.e., let Vout＝Vdata+ | Δ V |. Specifically, the resistance value of the feedback resistor 31 can be calculated by the following formula:
as the feedback resistor 31, it may be specifically a sliding rheostat or a digital potentiometer. In one embodiment, the feedback resistor 31 is a digital potentiometer, which has higher precision and can automatically adjust the resistance value through a microcontroller.
The brightness compensation device provided by the embodiment of the invention adopts the design of a digital potentiometer for the feedback resistor in the feedback circuit, monitors the brightness attenuation condition of the first display area in real time through the microprocessor, calculates the corresponding voltage quantity to be compensated according to the brightness attenuation condition, and sends a control instruction to the resistance value R of the digital potentiometer according to the voltage quantity to be compensatedfAnd the real-time adjustment is carried out, so that the brightness compensation of the first display area is realized, and the precision is improved. In addition, the digital potentiometer realizes the adjustment of the input voltage under the condition of not changing the working state of the power supply chip, and ensures the working stability of the system power supply.
The embodiment of the invention also provides a display module, which comprises a display panel, wherein the display panel comprises at least two display areas, and the display module also comprises a power supply module and the brightness compensation device of the display panel described in the embodiment.
The brightness compensation device in the display module provided by the embodiment of the invention comprises a microprocessor and a feedback circuit, wherein the feedback circuit is connected with the first display area which is always in a working state. The microprocessor firstly calculates the brightness attenuation value of the first display area according to the equivalent working time of the first display area, calculates the gray scale variation according to the brightness attenuation value, and then performs inverse proportion amplification on the input voltage of the first display area by using the feedback circuit according to the gray scale variation, namely, the inverse proportion adjustment of the input voltage of the first display area is completed through the feedback circuit, so that the voltage input quantity is increased, the purpose of increasing the luminous current of the first display area is achieved, and the brightness of the first display area is compensated and kept consistent with the brightness of the second display area.
It should be noted that while the operations of the method of the present invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Rather, the steps depicted in the flowcharts may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (10)
1. A method for compensating brightness of a display panel, wherein the display panel comprises at least two display regions, and a first display region of the at least two display regions is connected to a feedback circuit, the method comprising:
calculating a brightness attenuation value of the first display area according to the equivalent working time of the first display area;
calculating the gray scale variable quantity of the first display area according to the brightness attenuation value;
and according to the gray scale variable quantity, carrying out inverse proportion amplification on the input voltage of the first display area by using the feedback circuit so as to achieve a preset voltage value.
2. The method of claim 1, wherein calculating the luminance decay value of the first display region from the equivalent on-time of the first display region comprises:
acquiring the accumulated working time and the current brightness value of the first display area;
calculating the equivalent working time according to the accumulated working time, the current brightness value and a preset brightness value;
and calculating the brightness attenuation value according to the equivalent working time and the current brightness value.
3. The method of claim 2, wherein the equivalent operating time is calculated by the formula:
wherein, TARepresents the equivalent operating time, LARepresenting said current luminance value, TSRepresents the cumulative operating time, L0Representing the preset luminance value.
4. The method of claim 3, wherein the brightness decay value is calculated by the following equation:
where α denotes the brightness attenuation value, n denotes an acceleration factor, and C and β denote constant coefficients.
5. The method of claim 1, wherein the gray scale change amount is calculated by the following formula:
wherein | Δ Gray | represents the Gray scale variation amount, Gray_inAn input gray level representing said first display area, α0Represents a preset compensation value, α represents the brightness attenuation value, and gamma represents the gamma coefficient of the display panel.
6. The method of claim 1, wherein the feedback circuit is an inverse proportional amplifier circuit comprising a feedback resistor, the feedback resistor being adjustable,
wherein, according to the gray scale variation, the inverse proportion amplification is performed on the input voltage of the first display area by using the feedback circuit so as to reach a preset voltage value, and the method comprises the following steps:
converting the gray scale variable quantity into a voltage variable quantity according to a gray scale-voltage curve;
and according to the voltage variation, realizing inverse proportion amplification of the input voltage by adjusting the resistance value of the feedback resistor.
7. The method according to claim 6, wherein the inverse proportional amplifying circuit further comprises an operational amplifier, a first resistor, and a second resistor, wherein an inverting input terminal of the operational amplifier is electrically connected to the voltage supply terminal of the display panel through the first resistor, a non-inverting input terminal of the operational amplifier is grounded through the second resistor, an output terminal of the operational amplifier is electrically connected to the first display region for outputting the amplified voltage to the first display region, and both ends of the feedback resistor are electrically connected to the inverting input terminal and the output terminal of the operational amplifier, respectively,
wherein the resistance value of the feedback resistor is adjusted by the following formula:
wherein R isfRepresenting the resistance, R, of the feedback resistor1Represents the resistance value of the first resistor, | Δ V | represents the voltage variation, VinRepresents the input voltage provided by the voltage providing terminal for the display panel.
8. A brightness compensation apparatus for a display panel, wherein the display panel comprises at least two display regions, the apparatus comprising a microprocessor and a feedback circuit, the feedback circuit being connected to a first display region of the at least two display regions, the microprocessor being configured to:
calculating a brightness attenuation value of the first display area according to the equivalent working time of the first display area;
calculating the gray scale variable quantity of the first display area according to the brightness attenuation value;
and according to the gray scale variable quantity, carrying out inverse proportion amplification on the input voltage of the first display area by using the feedback circuit so as to achieve a preset voltage value.
9. The apparatus of claim 8, wherein the feedback circuit is an inverse proportional amplifying circuit, and comprises a feedback resistor, an operational amplifier, a first resistor, and a second resistor, wherein an inverting input terminal of the operational amplifier is electrically connected to the voltage supply terminal of the display panel through the first resistor, a non-inverting input terminal of the operational amplifier is grounded through the second resistor, an output terminal of the operational amplifier is electrically connected to the first display region for outputting the amplified voltage to the first display region, and two ends of the feedback resistor are electrically connected to the inverting input terminal and the output terminal of the operational amplifier, respectively.
10. A display module comprising a display panel including at least two display areas, the module further comprising a power supply module and a brightness compensation device of the display panel according to claim 8 or 9.
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