CN107705753B - Brightness compensation method of AMOLED display panel - Google Patents

Brightness compensation method of AMOLED display panel Download PDF

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CN107705753B
CN107705753B CN201710912931.2A CN201710912931A CN107705753B CN 107705753 B CN107705753 B CN 107705753B CN 201710912931 A CN201710912931 A CN 201710912931A CN 107705753 B CN107705753 B CN 107705753B
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pixel
sub
blue
white
pixel unit
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CN107705753A (en
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邓宇帆
周明忠
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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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]
    • G09G3/3225—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] using an active matrix
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Abstract

The invention discloses a brightness compensation method of an AMOLED display panel, wherein the AMOLED display panel comprises a plurality of pixel units which are arranged in an array, each pixel unit comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, and for any one pixel unit: normally compensating a red sub-pixel, a green sub-pixel and a white sub-pixel in the pixel unit so that actual brightness values of the red sub-pixel, the green sub-pixel and the white sub-pixel are equal to ideal brightness values; and overcompensating the blue sub-pixel in the pixel unit to enable the actual brightness value of the blue sub-pixel to be larger than the ideal brightness value, so that the blue light proportion in the white sub-pixel in the pixel unit is improved. The brightness compensation method can improve the color cast (yellowing) problem of the white sub-pixel caused by aging.

Description

Brightness compensation method of AMOLED display panel
Technical Field
The invention relates to the technical field of displays, in particular to a brightness compensation method of an AMOLED display panel.
Background
Organic Light Emitting Diodes (OLEDs) have a self-luminous property, and use a very thin Organic material coating and a glass substrate, so that when a current flows through the Organic material coating and the glass substrate, the Organic material emits Light, and the display screen of the OLED has a large viewing angle, and can significantly save electric energy, so that the application of the OLED is more and more widespread.
The core component of the OLED display device is an OLED display panel, and the structure of the OLED display panel generally includes: the pixel structure comprises a TFT array substrate, and an anode layer, a pixel definition layer, a first common layer for transmitting holes, a light emitting layer, a second common layer for transmitting electrons and a cathode layer which are sequentially manufactured on the TFT array substrate. The working principle of the OLED display panel is that under the action of an electric field between an anode and a cathode, holes are transmitted to a light-emitting layer through a first common layer, electrons are transmitted to the light-emitting layer through a second common layer, and the holes and the electrons are combined in the light-emitting layer to emit light. The sub-pixels disposed in the OLED display panel may be defined as sub-pixels including red (R), green (G), blue (B), and white (W) as one pixel unit. In each sub-pixel, a light emitting layer generating a specific wavelength of light for realizing one color is arranged.
The OLED display device may be classified into two major categories, i.e., direct addressing and thin film transistor Matrix addressing, of a Passive Matrix OLED (PMOLED) and an Active Matrix OLED (AMOLED) according to a driving method. The AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a large-sized display device with high definition. The AMOLED is a current-driven device, and when a current flows through an organic light emitting diode, the organic light emitting diode emits light, and the luminance is determined by the current flowing through the organic light emitting diode itself. Most of the existing integrated circuits only transmit voltage signals, so the pixel driving circuit of the AMOLED needs to complete the task of converting the voltage signals into current signals.
Since the AMOLED generates light by using a current passing through a thin film of an organic material, different organic materials emit light of different colors, and as the AMOLED is used, the organic material in the device is aged and the light emitting efficiency is lowered, resulting in a decrease in luminance and affecting the display quality of the product, the AMOLED display device must have a compensation measure to maintain its performance. In the conventional compensation measures, a measurement circuit is usually used to detect the electrical characteristics of each color sub-pixel, and then gray scale or voltage is adjusted to compensate, so that the actual brightness value of each sub-pixel reaches a target value (ideal brightness value).
However, for a white (W) sub-pixel, the combination of the red, green and blue light-emitting layers in the light-emitting layer typically produces white light. As different organic materials age at different rates, the different color components used to produce white light shift differently, specifically the blue portion may age faster than the red and green portions, thereby causing the display white point to shift, i.e., the color point of the white subpixel may shift yellow. The existing compensation measures only consider the overall compensation of the white sub-pixel, and do not consider the factor that the color point of the white sub-pixel is yellow over time, so the prior art still needs to be improved and developed.
Disclosure of Invention
In view of the above, the present invention provides a brightness compensation method for an AMOLED display panel, which improves the problem that the color point of a white sub-pixel is yellow over time while performing brightness compensation on each sub-pixel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a brightness compensation method of an AMOLED display panel, the AMOLED display panel comprises a plurality of pixel units arranged in an array, each pixel unit comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, wherein for any one pixel unit:
normally compensating a red sub-pixel, a green sub-pixel and a white sub-pixel in the pixel unit so that actual brightness values of the red sub-pixel, the green sub-pixel and the white sub-pixel are equal to ideal brightness values; and overcompensating the blue sub-pixel in the pixel unit to enable the actual brightness value of the blue sub-pixel to be larger than the ideal brightness value, so that the blue light proportion in the white sub-pixel in the pixel unit is improved.
The calculation formula for normally compensating the red sub-pixel, the green sub-pixel and the white sub-pixel in the pixel unit is as follows:
wherein x is selected from the group consisting ofR、xGOr xWAnd f is taken to be fR、fGOr fWCalculated x 'corresponds to x'R、x′GOr x'W；
The calculation formula for overcompensating the blue sub-pixel in the pixel unit is as follows:
in the above formula, xR、xG、xBAnd xWSequentially corresponding to input gray-scale values f of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unitR、fG、fBAnd fWSequentially correspond to a red sub-pixel, a green sub-pixel and a green sub-pixel in the pixel unit,Luminance attenuation proportionality coefficient, x 'of blue sub-pixel and white sub-pixel'R、x′G、x′BAnd x'WThe gray-scale values after compensation of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit sequentially correspond to one another, a is an adjustment coefficient constant, and Gamma is a Gamma value of the AMOLED display panel.
Specifically, the value of a is 0.05-0.1.
Further, the blue sub-pixels in the pixel units are overcompensated, and the blue light proportion of the white sub-pixels in the pixel units adjacent to the pixel units is improved; wherein, the calculation formula for overcompensating the blue sub-pixel in the pixel unit is adjusted as follows:
wherein x isWiIs the input gray-scale value of the white sub-pixel in the ith pixel unit, fWiThe luminance attenuation scale factor of the white sub-pixel corresponding to the ith pixel unit is 1, 2, … and k, wherein k is an integer and refers to the total number of the pixel units for increasing the blue light ratio.
Specifically, the value of k is 2-9.
In another aspect, the present invention provides a brightness compensation method for an AMOLED display panel, where the AMOLED display panel includes a plurality of pixel units arranged in an array, each pixel unit includes a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, where for any one pixel unit:
normally compensating the blue sub-pixel and the white sub-pixel in the pixel unit so that the actual brightness values of the blue sub-pixel and the white sub-pixel are equal to the ideal brightness value; and under-compensating the red sub-pixel and the green sub-pixel in the pixel unit to enable the actual brightness values of the red sub-pixel and the green sub-pixel to be smaller than an ideal brightness value so as to improve the proportion of blue light in the white sub-pixel in the pixel unit.
The calculation formula for normally compensating the blue sub-pixel and the white sub-pixel in the pixel unit is as follows:
wherein x is selected from the group consisting ofBOr xWAnd f is taken to be fBOr fWCalculated x 'corresponds to x'BOr x'W；
The calculation formula for under-compensating the red sub-pixel and the green sub-pixel in the pixel unit is as follows:
wherein x is1Is taken as xROr xG，f1Is corresponding to fROr fGX obtained by calculation1'corresponding is x'ROr x'G；
In the above formula, xR、xG、xBAnd xWSequentially corresponding to input gray-scale values f of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unitR、fG、fBAnd fWThe luminance attenuation proportionality coefficients x 'of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit correspond to'R、x′G、x′BAnd x'WThe gray-scale values after compensation of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit sequentially correspond to one another, a is an adjustment coefficient constant, and Gamma is a Gamma value of the AMOLED display panel.
Specifically, the value of a is 0.05-0.1.
Further, under-compensating the red sub-pixel and the green sub-pixel in the pixel unit, and also increasing the blue light proportion in the white sub-pixels in a plurality of pixel units adjacent to the pixel unit; wherein, the calculation formula for under-compensating the red sub-pixel and the green sub-pixel in the pixel unit is adjusted as follows:
wherein x isWiIs the input gray-scale value of the white sub-pixel in the ith pixel unit, fWiThe luminance attenuation scale factor of the white sub-pixel corresponding to the ith pixel unit is 1, 2, … and k, wherein k is an integer and refers to the total number of the pixel units for increasing the blue light ratio.
Specifically, the value of k is 2-9
Compared with the prior art, in an optimal technical scheme of the luminance compensation method of the AMOLED display panel provided by the embodiment of the invention, for any pixel unit, on the basis of compensating the luminance attenuation of the blue sub-pixel, the blue light of the same pixel unit or a pixel unit adjacent to the same pixel unit is further compensated by increasing the compensation amount (overcompensation) of the blue sub-pixel, so that the purpose of increasing the proportion of the blue light in the white sub-pixel is achieved, and the problem that the color point of the white sub-pixel is yellow along with time is also solved while the luminance compensation is performed on each sub-pixel. In another preferred technical solution, for any one pixel unit, on the basis of compensating the luminance attenuation of the red and green sub-pixels, the compensation amount of the red and green sub-pixels is slightly reduced (under-compensated), and the under-compensated part is supplemented by the red light and the green light in the white sub-pixel, thereby achieving the purpose of increasing the blue light proportion in the white sub-pixel, and improving the problem that the color point of the white sub-pixel is yellow over time while performing luminance compensation on each sub-pixel.
Drawings
Fig. 1 is a schematic structural diagram of an AMOLED display panel in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a display unit according to an embodiment of the present invention;
fig. 3 is a flowchart of the steps of the brightness compensation method of the AMOLED display panel in embodiment 1;
fig. 4 is a flowchart of the steps of the brightness compensation method of the AMOLED display panel in embodiment 2; .
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
Example 1
The present embodiment provides a brightness compensation method for an AMOLED display panel, as shown in fig. 1, the AMOLED display panel includes a plurality of pixel units P arranged in an array, where P ism,nRepresenting the pixel cell in the mth row and nth column. In the AMOLED display panel, as shown in FIG. 1, a pixel unit P is connected withm,nThe adjacent pixel unit includes Pm-1,n-1、Pm-1,n、Pm-1,n+1、Pm,n-1、Pm,n+1、Pm+1,n-1、Pm+1,nAnd Pm+1,n+1And m and n are integers. As shown in fig. 2, each pixel unit P includes a red subpixel R, a green subpixel G, a blue subpixel B, and a white subpixel W.
As shown in fig. 3, the brightness compensation method of the AMOLED display panel in the present embodiment includes the steps of:
and S11, acquiring the brightness attenuation proportion coefficient of each sub-pixel of the AMOLED display panel. The method for obtaining the brightness attenuation scale factor adopts the technical means commonly used in the art, and is not described in detail here.
For any one pixel unit P, such as P, in the AMOLED display panelm,n：
S12, for the pixel unit Pm,nRed seed of (1)The pixels R, G and W are normally compensated so that the actual luminance values of the red, green and white sub-pixels R, G and W are equal to the ideal luminance value.
Specifically, in the present embodiment, the pixel unit P is providedm,nThe calculation formula for performing normal compensation on the red sub-pixel R, the green sub-pixel G and the white sub-pixel W in (1) is as follows:
in the formula, the value of x is xR、xGOr xWAnd f is taken to be fR、fGOr fWCalculated x 'corresponds to x'R、x′GOr x'W. Wherein x isR、xGAnd xWSequentially correspond to the pixel units Pm,nInput gray-scale values of the red, green and white sub-pixels R, G and W, fR、fGAnd fWSequentially correspond to the pixel units Pm,nIn red, green and white sub-pixels R, G and W, and has a luminance attenuation proportionality coefficient x'R、x′GAnd x'WSequentially correspond to the pixel units Pm,nThe compensated gray-scale values of the red sub-pixel R, the green sub-pixel G and the white sub-pixel W in (1), and Gamma is a Gamma value of the AMOLED display panel.
S13, for the pixel unit Pm,nThe blue sub-pixel B is over-compensated, so that the actual brightness value of the blue sub-pixel B is greater than the ideal brightness value, thereby increasing the pixel unit Pm,nThe blue light proportion in the white subpixel W in (1). Specifically, the blue light component in the white subpixel W can be further compensated by overcompensating the blue subpixel B, so that the proportion of the blue light in the white subpixel W is increased.
Specifically, in the present embodiment, the pixel unit P is providedm,nThe formula for overcompensating the blue sub-pixel B in (1) is as follows:
in the formula, xBIs the pixel unit Pm,nInput gray level value, f, of blue sub-pixel BBIs the pixel unit Pm,nLuminance attenuation proportionality coefficient, x 'of blue sub-pixel B in'BIs the pixel unit Pm,nThe compensated gray scale value of the blue sub-pixel B in (1), a is an adjustment coefficient constant, and γ is a Gamma value of the AMOLED display panel.
Specifically, the value of a can be selected to be 0.05-0.1, and the Gamma value of the AMOLED display panel is usually set to be 2.2.
In the above embodiment, the pixel unit P ism,nThe blue sub-pixel B in (1) is overcompensated, only considering for boosting the same pixel cell Pm,nThe blue light proportion in the white subpixel W in (1).
In a more preferred embodiment, the pixel unit P ism,nThe blue sub-pixel B is over-compensated and is also used for lifting and lifting the pixel unit Pm,nSeveral adjacent pixel units (pixel unit P)m-1,n-1、Pm-1,n、Pm-1,n+1、Pm,n-1、Pm,n+1、Pm+1,n-1、Pm+1,nAnd Pm+1,n+1All or a portion of) of the white sub-pixels W. At this time, in step S13, the pixel cell P is subjected tom,nThe calculation formula for overcompensation of the blue sub-pixel B is adjusted as follows:
wherein x isWiIs the input gray-scale value, f, of the white sub-pixel W in the ith pixel unitWiThe luminance attenuation scale factor of the white sub-pixel W corresponding to the ith pixel unit, i is 1, 2, …, k is an integer, and k is the total number of pixel units to be scaled up by blue light. Referring to fig. 1, if for the pixel unit Pm,nThe overcompensation of the blue sub-pixel B requires consideration of boosting all the neighboring pixel cells Pm-1,n-1、Pm-1,n、Pm-1,n+1、Pm,n-1、Pm,n+1、Pm+1,n-1、Pm+1,nAnd Pm+1,n+1And then includes its own pixel unit Pm,nThen k takes a value of 9. If to the pixel unit Pm,nThe blue sub-pixel B is overcompensated only for lifting another adjacent pixel unit, for example, the right pixel unit Pm,n+1Then k takes a value of 2. Therefore, the value of k can be adjusted within the range of 2-9 according to actual needs.
In the luminance compensation method for the AMOLED display panel provided in the above embodiment, for any one pixel unit, on the basis of compensating the luminance attenuation of the blue sub-pixel, the blue light of the same pixel unit or a pixel unit adjacent to the same pixel unit is further compensated by increasing the compensation amount (overcompensation) of the blue sub-pixel, so as to achieve the purpose of increasing the proportion of the blue light in the white sub-pixel, and while performing luminance compensation on each sub-pixel, the problem that the color point of the white sub-pixel is yellow over time is also improved.
Example 2
The present embodiment provides a brightness compensation method for an AMOLED display panel, as shown in fig. 1, the AMOLED display panel includes a plurality of pixel units P arranged in an array, where P ism,nRepresenting the pixel cell in the mth row and nth column. In the AMOLED display panel, as shown in FIG. 1, a pixel unit P is connected withm,nThe adjacent pixel unit includes Pm-1,n-1、Pm-1,n、Pm-1,n+1、Pm,n-1、Pm,n+1、Pm+1,n-1、Pm+1,nAnd Pm+1,n+1And m and n are integers. As shown in fig. 2, each pixel unit P includes a red subpixel R, a green subpixel G, a blue subpixel B, and a white subpixel W.
As shown in fig. 4, the brightness compensation method of the AMOLED display panel in the present embodiment includes the steps of:
and S21, acquiring the brightness attenuation proportion coefficient of each sub-pixel of the AMOLED display panel. The method for obtaining the brightness attenuation scale factor adopts the technical means commonly used in the art, and is not described in detail here.
For any one pixel unit P, such as P, in the AMOLED display panelm,n：
S22, for the pixel unit Pm,nThe blue sub-pixel B and the white sub-pixel W are normally compensated so that the actual luminance values of the blue sub-pixel B and the white sub-pixel W are equal to the ideal luminance value.
Specifically, in the present embodiment, the pixel unit P is providedm,nThe calculation formula for performing normal compensation on the blue sub-pixel B and the white sub-pixel W in (1) is as follows:
in the formula, the value of x is xBOr xWAnd f is taken to be fBOr fWCalculated x 'corresponds to x'BOr x'W. Wherein x isBAnd xWSequentially correspond to the pixel units Pm,nInput gray-scale values, f, of the blue sub-pixel B and the white sub-pixel WBAnd fWSequentially correspond to the pixel units Pm,nLuminance attenuation proportionality coefficient, x 'of blue sub-pixel B and white sub-pixel W in'BAnd x'WSequentially correspond to the pixel units Pm,nThe compensated gray-scale values of the blue sub-pixel B and the white sub-pixel W in (1), and Gamma is the Gamma value of the AMOLED display panel.
S23, for the pixel unit Pm,nThe red sub-pixel R and the green sub-pixel G in (1) are under-compensated, so that the actual luminance values of the red sub-pixel R and the green sub-pixel G are smaller than the ideal luminance value, thereby improving the pixel unit Pm,nThe blue light proportion in the white subpixel W in (1). Specifically, by performing under-compensation on the red subpixel R and the green subpixel G, red and green light components in the white subpixel W can be offset, and the blue light proportion in the white subpixel W is improved.
Specifically, in the present embodiment, the pixel unit P is providedm,nThe calculation formula for under-compensating the red sub-pixel R and the green sub-pixel G in (1) is as follows:
in the formula, x1Is taken as xROr xG，f1Is corresponding to fROr fGX obtained by calculation1'corresponding is x'ROr x'G. Wherein x isRAnd xGSequentially correspond to the pixel units Pm,nInput gray-scale values of the red and green sub-pixels R and G, fRAnd fGSequentially correspond to the pixel units Pm,nLuminance attenuation proportionality coefficient, x 'of red sub-pixel R and green sub-pixel G in'RAnd x'GSequentially correspond to the pixel units Pm,nIn the AMOLED display panel, a is an adjustment coefficient constant, and γ is a Gamma value of the AMOLED display panel.
Specifically, the value of a can be selected to be 0.05-0.1, and the Gamma value of the AMOLED display panel is usually set to be 2.2.
In the above embodiment, the pixel unit P ism,nThe red sub-pixel R and the green sub-pixel G in (1) are under-compensated, only considering the pixel unit P for lifting the samem,nThe blue light proportion in the white subpixel W in (1).
In a more preferred embodiment, the pixel unit P ism,nThe red sub-pixel R and the green sub-pixel G are under-compensated and are used for lifting and the pixel unit Pm,nSeveral adjacent pixel units (pixel unit P)m-1,n-1、Pm-1,n、Pm-1,n+1、Pm,n-1、Pm,n+1、Pm+1,n-1、Pm+1,nAnd Pm+1,n+1All or a portion of) of the white sub-pixels W. At this time, in step S23, the pixel cell P is subjected tom,nThe calculation formula for overcompensation of the blue sub-pixel B is adjusted as follows:
wherein x isWiIs the input gray-scale value, f, of the white sub-pixel W in the ith pixel unitWiThe luminance attenuation scale factor of the white sub-pixel W corresponding to the ith pixel unit, i is 1, 2, …, k is an integer, and k is the total number of pixel units to be scaled up by blue light. Referring to fig. 1, if for the pixel unit Pm,nThe red sub-pixel R and the green sub-pixel G under-compensate in (1) needs to consider lifting all the adjacent pixel units Pm-1,n-1、Pm-1,n、Pm-1,n+1、Pm,n-1、Pm,n+1、Pm+1,n-1、Pm+1,nAnd Pm+1,n+1And then includes its own pixel unit Pm,nThen k takes a value of 9. If to the pixel unit Pm,nThe red sub-pixel R and the green sub-pixel G of (1) are under-compensated only to promote another adjacent pixel unit, for example, the right pixel unit Pm,n+1Then k takes a value of 2. Therefore, the value of k can be adjusted within the range of 2-9 according to actual needs.
In the luminance compensation method for the AMOLED display panel provided in the above embodiment, for any one pixel unit, on the basis of compensating the luminance attenuation of the red and green sub-pixels, the compensation amount (under-compensation) of the red and green sub-pixels is slightly reduced, and the under-compensated portion is supplemented by the red light and the green light in the white sub-pixel, so that the purpose of increasing the blue light proportion in the white sub-pixel is also achieved, and the problem that the color point of the white sub-pixel is yellow over time is also improved while the luminance compensation is performed on each sub-pixel.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (8)

1. A brightness compensation method of an AMOLED display panel, the AMOLED display panel comprises a plurality of pixel units which are arranged in an array, each pixel unit comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, and the method is characterized in that for any one pixel unit:
normally compensating a red sub-pixel, a green sub-pixel and a white sub-pixel in the pixel unit so that actual brightness values of the red sub-pixel, the green sub-pixel and the white sub-pixel are equal to ideal brightness values; performing overcompensation on the blue sub-pixel in the pixel unit, so that the actual brightness value of the blue sub-pixel is larger than the ideal brightness value, and the blue light proportion in the white sub-pixel in the pixel unit is improved;
the calculation formula for normally compensating the red sub-pixel, the green sub-pixel and the white sub-pixel in the pixel unit is as follows:
wherein x is selected from the group consisting ofR、xGOr xWAnd f is taken to be fR、fGOr fWCalculated x 'corresponds to x'R、x′GOr x'W；
The calculation formula for overcompensating the blue sub-pixel in the pixel unit is as follows:
in the above formula, xR、xG、xBAnd xWSequentially corresponding to input gray-scale values f of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unitR、fG、fBAnd fWThe luminance attenuation proportionality coefficients x 'of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit correspond to'R、x′G、x′BAnd x'WThe gray-scale values after compensation of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit sequentially correspond to one another, a is an adjustment coefficient constant, and Gamma is a Gamma value of the AMOLED display panel.
2. The brightness compensation method for the AMOLED display panel as claimed in claim 1, wherein a is 0.05-0.1.
3. The brightness compensation method of the AMOLED display panel as claimed in claim 1 or 2, wherein the blue sub-pixels in the pixel units are over-compensated and further used for increasing the blue light proportion in the white sub-pixels in a plurality of pixel units adjacent to the pixel units;
wherein, the calculation formula for overcompensating the blue sub-pixel in the pixel unit is adjusted as follows:
wherein x isWiIs the input gray-scale value of the white sub-pixel in the ith pixel unit, fWiThe luminance attenuation proportion coefficient of the white sub-pixel corresponding to the ith pixel unit is 1, 2, … and k, k is an integer, and k is a pixel unit for increasing the proportion of blue lightThe total number of elements.
4. The brightness compensation method for the AMOLED display panel as claimed in claim 3, wherein k is 2-9.
5. A brightness compensation method of an AMOLED display panel, the AMOLED display panel comprises a plurality of pixel units which are arranged in an array, each pixel unit comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, and the method is characterized in that for any one pixel unit:
normally compensating the blue sub-pixel and the white sub-pixel in the pixel unit so that the actual brightness values of the blue sub-pixel and the white sub-pixel are equal to the ideal brightness value; under-compensating a red sub-pixel and a green sub-pixel in the pixel unit to enable actual brightness values of the red sub-pixel and the green sub-pixel to be smaller than an ideal brightness value so as to improve blue light proportion in a white sub-pixel in the pixel unit;
the calculation formula for normally compensating the blue sub-pixel and the white sub-pixel in the pixel unit is as follows:
wherein x is selected from the group consisting ofBOr xWAnd f is taken to be fBOr fWCalculated x 'corresponds to x'BOr x'W；
The calculation formula for under-compensating the red sub-pixel and the green sub-pixel in the pixel unit is as follows:
wherein x is1Is taken as xROr xG，f1Is corresponding to fROr fGCalculating the resulting x'1Is correspondingly x'ROr x'G；
Above disclosureIn the formula, xR、xG、xBAnd xWSequentially corresponding to input gray-scale values f of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unitR、fG、fBAnd fWThe luminance attenuation proportionality coefficients x 'of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit correspond to'R、x′G、x′BAnd x'WThe gray-scale values after compensation of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the pixel unit sequentially correspond to one another, a is an adjustment coefficient constant, and Gamma is a Gamma value of the AMOLED display panel.
6. The method for compensating the brightness of the AMOLED display panel as claimed in claim 5, wherein a is 0.05-0.1.
7. The brightness compensation method of the AMOLED display panel as claimed in claim 5 or 6, wherein the red sub-pixel and the green sub-pixel in the pixel unit are under-compensated and are further used for increasing the proportion of blue light in the white sub-pixel in a plurality of pixel units adjacent to the pixel unit;
wherein, the calculation formula for under-compensating the red sub-pixel and the green sub-pixel in the pixel unit is adjusted as follows:
wherein x isWiIs the input gray-scale value of the white sub-pixel in the ith pixel unit, fWiThe luminance attenuation scale factor of the white sub-pixel corresponding to the ith pixel unit is 1, 2, … and k, wherein k is an integer and refers to the total number of the pixel units for increasing the blue light ratio.
8. The method for compensating the brightness of the AMOLED display panel as claimed in claim 7, wherein k is 2-9.
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