CN110021268B - Display control method and device of OLED - Google Patents

Display control method and device of OLED Download PDF

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Publication number
CN110021268B
CN110021268B CN201910303294.8A CN201910303294A CN110021268B CN 110021268 B CN110021268 B CN 110021268B CN 201910303294 A CN201910303294 A CN 201910303294A CN 110021268 B CN110021268 B CN 110021268B
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oled
scale value
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current temperature
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CN110021268A (en
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刘晓龙
齐爱想
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BOE Technology Group 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]
    • 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

Abstract

The application provides a display control method and device of an OLED (organic light emitting diode), wherein the method comprises the following steps: acquiring an input gray scale value and acquiring a current temperature value; acquiring a corresponding digital gamma curve DGC adjusting value according to the current temperature value; calculating an output gray level value according to the input gray level value and the DGC adjustment value; and controlling the OLED according to the output gray-scale value. The method can compensate the input gray-scale value according to the current temperature value, and the problem of OLED color cast at low temperature is solved. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.

Description

Display control method and device of OLED
Technical Field
The present application relates to the field of display technologies, and in particular, to a display control method and device for an OLED.
Background
An Organic Light Emitting Display (OLED) is a popular Display technology at present, and compared with a Liquid Crystal Display (LCD), the OLED has the advantages of being Light, thin, flexible, low in power consumption, high in contrast, high in color gamut, and the like, and especially the response time at low temperature is not affected by temperature, so that the OLED is popular among more users. At present, most OLED light-emitting structures independently emit red, green and blue light, and white light and color film structures also exist. The design of red, green and blue independent luminescence is limited and influenced by luminescent materials, and white pictures can display blue at low temperature below-10 ℃.
In order to solve the problem of blue display of the white screen, in the related art, a piece of heated glass is attached to the OLED. However, the mode of attaching the heating glass is adopted, the heating power consumption is high, the characteristics of flexibility, lightness, thinness and the like of the OLED are influenced, and curved surface display cannot be achieved, so that the advantages of the OLED are reduced.
Disclosure of Invention
The application provides a display control method and device of an OLED (organic light emitting diode) so as to compensate an input gray-scale value according to a current temperature value and solve the problem of color cast of the OLED at a low temperature. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.
An embodiment of one aspect of the present application provides a display control method for an OLED, including:
acquiring an input gray scale value and acquiring a current temperature value;
acquiring a corresponding digital gamma curve DGC adjusting value according to the current temperature value;
calculating an output gray level value according to the input gray level value and the DGC adjusting value; and
and controlling the OLED according to the output gray-scale value.
As a first possible implementation manner of the embodiment of the present application, the obtaining a corresponding adjustment value of a digital gamma curve DGC according to the current temperature value includes:
and inquiring a preset comparison table according to the input gray-scale value and the current temperature value to obtain a corresponding DGC adjustment value.
As a second possible implementation manner of the embodiment of the application, in the preset comparison table, the blue gray scale value is gradually decreased with a first ratio along with the decrease of the current temperature, and the green gray scale value is gradually decreased with a second ratio along with the decrease of the current temperature.
As a third possible implementation manner of the embodiment of the present application, the first ratio and the second ratio are the same.
As a fourth possible implementation manner of the embodiment of the present application, the digital gamma curve is a 2.2 gamma curve, the DGC adjustment value is a ^2.2, the input gray level value is x, the output gray level value is y,
the calculating an output gray level value according to the input gray level value and the DGC adjustment value comprises:
when y corresponds to the brightness lyEqual to the brightness L corresponding to xxAccording to the formula l255＝a^2.2*L255And Lx＝(x/255)^2.2*L255And calculating to obtain:
ly＝(y/255)^2.2*l255＝(y/255)^2.2*a^2.2*L255＝[(y/a)/255]^2.2*L255＝Lx；
y＝ax。
according to the display control method of the OLED, the input gray-scale value is obtained, the current temperature value is obtained, the corresponding digital gamma curve DGC adjusting value is obtained according to the current temperature value, the output gray-scale value is calculated according to the input gray-scale value and the DGC adjusting value, and finally the OLED is controlled according to the output gray-scale value. Therefore, according to the current temperature value, the input gray-scale value is compensated, and the problem of OLED color cast at low temperature is solved. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.
In another aspect of the present application, an embodiment provides a display control apparatus for an OLED, including:
the temperature sensor is used for acquiring an input gray level value and acquiring a current temperature value;
the processor is used for acquiring a corresponding digital gamma curve DGC adjusting value according to the current temperature value;
the time schedule controller is used for calculating an output gray scale value according to the input gray scale value and the DGC adjusting value; and controlling the OLED according to the output gray-scale value.
As a first possible implementation manner of the embodiment of the present application, the processor stores a preset comparison table, and is specifically configured to:
and inquiring the preset comparison table according to the input gray-scale value and the current temperature value to obtain a corresponding DGC adjustment value.
As a second possible implementation manner of the embodiment of the application, in the preset comparison table, the blue gray scale value is gradually decreased with a first ratio along with the decrease of the current temperature, and the green gray scale value is gradually decreased with a second ratio along with the decrease of the current temperature.
As a third possible implementation manner of the embodiment of the present application, the first ratio and the second ratio are the same.
As a fourth possible implementation manner of the embodiment of the present application, the digital gamma curve is a 2.2 gamma curve, the DGC adjustment value is a ^2.2, the input gray level value is x, the output gray level value is y,
the time schedule controller is specifically configured to:
when y corresponds to a brightness of lyEqual to x corresponds to a luminance of LxAccording to the formula l255＝a^2.2*L255And Lx＝(x/255)^2.2*L255And calculating to obtain:
ly＝(y/255)^2.2*l255＝(y/255)^2.2*a^2.2*L255＝[(y/a)/255]^2.2*L255＝Lx；
y＝ax。
according to the OLED display control device, the input gray-scale value is obtained, the current temperature value is obtained, the corresponding digital gamma curve DGC adjusting value is obtained according to the current temperature value, the output gray-scale value is calculated according to the input gray-scale value and the DGC adjusting value, and finally the OLED is controlled according to the output gray-scale value. Therefore, according to the current temperature value, the input gray-scale value is compensated, and the problem of OLED color cast at low temperature is solved. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.
In another aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program is executed by a processor to implement the display control method of the OLED as described in the foregoing embodiments.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a display screen;
fig. 2 is a schematic flowchart illustrating a display control method of an OLED according to an embodiment of the present disclosure;
FIG. 3 is a diagram illustrating a relationship between a current temperature value and an output gray level value;
FIG. 4 is a schematic diagram of an application scenario according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a DGC adjustment value modification principle;
fig. 6 is a schematic flowchart of a display control method of an OLED according to a second embodiment of the present application;
fig. 7 is a schematic structural diagram of a display control device of an OLED according to a third embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
In the prior art, in order to solve the problem that a white picture is displayed to be bluish, a piece of heating glass is attached to an OLED. For example, referring to fig. 1, where 1 denotes an OLED, 2 denotes a lead, 3 denotes a heat-coated Indium Tin Oxide (ITO) glass, and the heat-coated ITO glass 3 is disposed under a screen of the OLED 1. However, the mode of attaching the heating glass is adopted, the heating power consumption is high, the characteristics of flexibility, lightness, thinness and the like of the OLED are influenced, and curved surface display cannot be achieved, so that the original advantages of the OLED are reduced.
Therefore, the application mainly aims at the mode of heating glass by laminating in the prior art, the heating power consumption is higher, meanwhile, the characteristics of flexibility, lightness and thinness and the like of the OLED are influenced, and curved surface display cannot be carried out, so that the technical problem of the original advantages of the OLED is reduced, and the OLED display control method is provided.
According to the display control method of the OLED, the input gray-scale value is obtained, the current temperature value is obtained, the corresponding digital gamma curve DGC adjusting value is obtained according to the current temperature value, the output gray-scale value is calculated according to the input gray-scale value and the DGC adjusting value, and finally the OLED is controlled according to the output gray-scale value. Therefore, according to the current temperature value, the input gray-scale value is compensated, and the problem of OLED color cast at low temperature is solved. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.
A display control method and apparatus of an OLED according to an embodiment of the present application are described below with reference to the accompanying drawings. Before describing embodiments of the present invention in detail, for ease of understanding, common terminology will be introduced first:
the gray scale divides the brightness variation between the brightest and darkest in the image display of the display into several parts so as to facilitate the control of the screen brightness corresponding to the signal input. Each digital image is composed of a plurality of dots, also called pixels, each of which can usually represent a plurality of different colors, and is composed of three sub-pixels of red, green and blue (RGB). Each sub-pixel, the light source behind it, may exhibit a different brightness level. And the gray levels represent gradation levels of different brightness from the darkest to the brightest. The more the intermediate levels are, the more exquisite the picture effect can be presented. Taking an 8-bit gray scale image as an example, 256 (2) can be expressed8) And a brightness level is called 256 gray levels. That is, the color change of each point on the screen is actually caused by the gray-scale value changes of the three RGB sub-pixels constituting the point.
Fig. 2 is a flowchart illustrating a display control method of an OLED according to an embodiment of the present disclosure.
The main execution body of the embodiment of the present application is the display control device of the OLED, and the display control device of the OLED can be configured in any computer device, so that the computer device can execute the display control function of the OLED.
The Computer device may be any device having a computing function, for example, a Personal Computer (PC), a cloud device, a mobile device, and the like, which is not limited thereto. The mobile device may be, for example, a mobile phone, a tablet, a personal digital assistant, a wearable device, and/or other hardware devices having various operating systems, touch screens, and/or display screens.
As shown in fig. 2, the display control method of the OLED includes the steps of:
step 101, obtaining an input gray level value and obtaining a current temperature value.
It can be understood that the OLED is used for displaying an image, and the pixel value of each pixel point in the image is a gray-scale value. Therefore, in the embodiment of the present application, the corresponding input gray level value may be determined according to each pixel point in the input image. The input image is an image to be displayed by the OLED. For example, if the pixel value of the pixel a in the input image is 255, the input gray scale value corresponding to the pixel a is 255.
In the embodiment of the application, the current temperature value can be collected through the temperature sensor, and after the temperature sensor collects the current temperature value, the OLED control device can obtain the current temperature value from the temperature sensor.
And 102, acquiring a corresponding digital gamma curve DGC adjustment value according to the current temperature value.
It can be understood that, due to the characteristic that the OLED is not affected by temperature, at normal temperature, the input gray scale value and the output gray scale value should be equal, wherein the output gray scale value is the gray scale value to be displayed by the display. For example, the input gray scale value is 255, and the output gray scale value is also 255. When the temperature is low, such as the current temperature is lower than-10 ℃, the white picture displays blue, and the OLED has color cast. Therefore, in the present application, in order to improve the problem of color shift of the OLED at low temperature, a Digital Gamma Curve (DGC) adjustment value corresponding to the current temperature value may be determined, so as to adjust the input gray-scale value according to the DGC adjustment value.
In the embodiment of the present application, a corresponding relationship between different temperature values and a digital gamma curve (DIGITAL GAMMA CODE, DGC for short) adjustment value may be preset, and after a current temperature value is determined, the corresponding relationship may be queried to determine a DGC adjustment value corresponding to the current temperature value.
And 103, calculating an output gray-scale value according to the input gray-scale value and the DGC adjusting value.
Through the analysis of the abnormal color of the picture, the applicant finds that the reason that the white picture displays blue is as follows: at low temperature, the brightness of the red sub-pixel corresponding to each pixel point in the image becomes low, while the brightness of the blue sub-pixel and the green sub-pixel is unchanged, so that the picture display is blue.
As an example, the applicant performs a low-temperature operation test on a certain type of OLED display panel, and obtains values of a gray scale value of a red sub-pixel (herein, referred to as a red gray scale value), a gray scale value of a green sub-pixel (herein, referred to as a green gray scale value), and a gray scale value of a blue sub-pixel (herein, referred to as a blue gray scale value) under different low-temperature conditions, as shown in fig. 3, where fig. 3 is a schematic diagram of a corresponding relationship between a current temperature value and an output gray scale value. As can be seen from fig. 3, when the gray scale value of a certain pixel point is 255, under a low temperature condition, the gray scale value of the red sub-pixel corresponding to the pixel point gradually decreases with the decrease of the current temperature value, and the gray scale values of the blue sub-pixel and the green sub-pixel do not change with the decrease of the current temperature value, so that the display of the screen is turned to blue.
Therefore, in the present application, in order to balance the luminance of the three colors of red, green and blue, the luminance of the blue sub-pixel and the green sub-pixel may be reduced to restore the white picture color. That is, the gray scale values of the blue sub-pixel and the green sub-pixel can be reduced to balance the gray scale values of the red, green and blue colors, so as to recover the white picture color.
Specifically, the green gray scale value and the blue gray scale value to be output may be calculated according to the input gray scale value and the DGC adjustment value, and the red gray scale value is unchanged, that is, the red gray scale value is equal to the input gray scale value. For example, when the input gray level is 255 (the red, blue, and green gray levels are all 255), the output gray level has a red gray level of 255, a blue gray level of 250, and a green gray level of 250.
And 104, controlling the OLED according to the output gray-scale value.
In the embodiment of the application, after the output gray-scale value is obtained through calculation, the OLED can be controlled according to the output gray-scale value.
For example, for the pixel a in the input image, the corresponding input gray-scale value is 255 (the red gray-scale value, the blue gray-scale value, and the green gray-scale value are 255), the red gray-scale value corresponding to the output gray-scale value is 255, the blue gray-scale value is 250, and the green gray-scale value is 250, so that when the OLED displays the corresponding image, the pixel a is corresponding to the pixel a, the displayed red gray-scale value is 255, the blue gray-scale value is 250, and the green gray-scale value is 250.
When it needs to be explained, for other pixel points in the input image, the corresponding output gray-scale value can also be calculated according to the corresponding input gray-scale value and the DGC adjustment value. That is, for different input gray-scale values, the corresponding blue gray-scale value and green gray-scale value to be output can be determined according to the DGC adjustment value. Therefore, the blue gray scale value and the green gray scale value corresponding to each pixel point in the input image can be adjusted, the red gray scale value is kept unchanged, the gray scale values of the red, the green and the blue can be balanced under the low-temperature condition, the white picture color is recovered, and the problem of OLED color cast under the low temperature is solved.
In the embodiment of the application, after the current temperature value is determined, the DGC adjustment value may be determined according to the current temperature value, and then, the gray-scale values corresponding to the pixel points in the input image are uniformly adjusted according to the DGC adjustment value, so that the adjusted gray-scale values (to-be-displayed content of the OLED) corresponding to the pixel points can be obtained, and thus, the processing efficiency can be improved.
According to the display control method of the OLED, the input gray-scale value is obtained, the current temperature is obtained, the corresponding digital gamma curve DGC adjusting value is obtained according to the current temperature value, the output gray-scale value is calculated according to the input gray-scale value and the DGC adjusting value, and finally the OLED is controlled according to the output gray-scale value. Therefore, according to the current temperature value, the input gray-scale value is compensated, and the problem of OLED color cast at low temperature is solved. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.
As an example, referring to fig. 4, the input gray scale value may be adjusted by an android main chip RK3288 having Analog-to-Digital Conversion (ADC) function. Specifically, the current temperature value may be acquired by the temperature sensor, for example, the current temperature value may be detected by the temperature sensor every preset time (for example, 5 minutes), and the DGC adjustment value of the timing controller (TCON for short) of the OLED may be modified according to the current temperature value through the lane0 channel of the RK3288, so that the input gray level value may be adjusted according to the DGC adjustment value. Therefore, by RK3288, the DGC adjustment value of the OLED can be modified in real time, and the problem of color cast of the OLED at low temperature is solved.
In fig. 4, the principle of adjusting the value by modifying the DGC is: for example, referring to fig. 5, in the default case, the DGC doubles the RGB gray-scale value of the pixel, inserts another gray-scale between two adjacent gray-scales, changes the gray-scale value of the input signal by fine-tuning the DGC, and finally adjusts the brightness displayed on the OLED by the analog gamma circuit and the SOURCE IC.
As can be seen from fig. 5, adjusting the DGC is equivalent to selecting a part of a complete gamma curve, and in order to ensure that the adjusted gamma curve is still 2.2 curves, assuming that the analog gamma circuit is not affected by temperature, the DGC can be adjusted as follows:
assuming that the DGC adjustment value corresponding to the current temperature value is a ^2.2, x is the input gray level value, y is the adjusted output gray level value, and LxTo adjust the brightness corresponding to the front x,/yThe adjusted brightness of x is obtained. Wherein l255＝a^2.2*L255，Lx＝(x/255)^2.2*L255When the brightness l corresponding to the gray level value of 255 is detected255If the brightness corresponding to the adjusted gray-scale value is equal to the brightness before adjustment, then:
ly＝(y/255)^2.2*l255＝(y/255)^2.2*a^2.2*L255＝[(y/a)/255]^2.2*L255＝Lx；
due to Lx＝(x/255)^2.2*L255Y/a-x, i.e. y-ax, can be determined.
That is to say, all the input gray scale values can be reduced according to a certain proportion, so that the 2.2 gamma curve can be ensured, and the display effect of the display screen can be ensured.
Therefore, for step 103, for each pixel point in the input image, the corresponding input gray-scale value may be multiplied by a in the DGC adjustment value to obtain an output gray-scale value. And the red gray-scale value corresponding to each pixel point is unchanged, and the green gray-scale value and the blue gray-scale value are adjusted along with the output gray-scale value.
As a possible implementation manner, in order to improve the adjustment efficiency of the gray scale values, for each gray scale value, the DGC adjustment values corresponding to the gray scale value at different temperature values may be obtained through experiments, and the corresponding relationship among the gray scale value, the temperature value, and the DGC adjustment values is stored in the preset comparison table. The above process is explained in detail with reference to fig. 6.
Fig. 6 is a flowchart illustrating a display control method of an OLED according to a second embodiment of the present application.
As shown in fig. 6, the display control method of the OLED may include the steps of:
step 201, obtaining an input gray level value, and obtaining a current temperature value.
The execution process of step 201 may refer to the execution process of step 101 in the above embodiments, which is not described herein again.
Step 202, querying a preset comparison table according to the input gray-scale value and the current temperature value to obtain a corresponding DGC adjustment value.
In the embodiment of the application, for each gray scale value, a low-temperature working experiment can be performed on the OLED in advance, a DGC adjustment value corresponding to the gray scale value at different temperatures is simulated, and the corresponding relationship among the gray scale value, the temperature value and the DGC adjustment value is stored in a preset comparison table.
Therefore, after the input gray scale value and the current temperature value are determined, the preset comparison table can be queried according to the input gray scale value and the current temperature value, and the DGC adjustment value corresponding to the input gray scale value and the current temperature value is obtained.
Further, because the DGC adjustments corresponding to different types of OLEDs may be the same or different, in the present application, in order to improve the accuracy of the DGC adjustment value determination result, for each gray-scale value, a low-temperature working experiment may be performed in advance for each type of OLED, and the DGC adjustment value corresponding to the gray-scale value at different temperatures is simulated.
Step 203, calculating an output gray level value according to the input gray level value and the DGC adjustment value.
And step 204, controlling the OLED according to the output gray-scale value.
The execution process of steps 203 to 204 may refer to the execution process of steps 103 to 104 in the above embodiments, which is not described herein again.
It should be noted that, although the problem of color shift of the OLED at low temperature can be improved by changing the light emitting structure of the OLED from red, green and blue to a white light color-added film structure, the white light color-added film structure has higher power consumption, lower brightness, lower contrast and lower color gamut than the red, green and blue independent light emitting structure.
Alternatively, a light-emitting material with more stable temperature characteristics can be developed to improve the problem of color shift of the OLED at low temperature, but the development cost is higher.
In the application, the output gray-scale value is calculated according to the input gray-scale value and the DGC adjusting value, the brightness, the contrast and the color gamut do not need to be sacrificed, meanwhile, the problem of color cast of the OLED at low temperature can be solved on the basis of not increasing the heating power consumption and the research and development cost, and the application scene of the OLED is expanded.
Compared with the previous embodiment, the technical solution in the embodiment of the present application at least has the following further technical effects or advantages:
the corresponding DGC adjustment value is obtained by querying the preset comparison table according to the input gray-scale value and the current temperature value, so that the query efficiency of the DGC can be improved, and the adjustment efficiency of the gray-scale value is improved.
As a possible implementation manner, the preset comparison table may further be provided with a corresponding relationship between the input gray scale value, the temperature value, and the output gray scale value, so that, in the present application, after the input gray scale value and the current temperature value are determined, the preset comparison table may be directly queried to determine the corresponding input gray scale value.
For example, the applicant conducted low temperature operation experiments on a certain type of OLED display screen to simulate output gray scale values (red gray scale value, blue gray scale value, and green gray scale value) at different temperatures when the input gray scale value is 255.
Figure BDA0002028962020000081
TABLE 1 Preset COMPARATIVE TABLE
As can be seen from table 1, in the preset comparison table, the blue gray scale value and the green gray scale value gradually decrease with the decrease of the current temperature, and the red gray scale value is not adjusted.
As a possible implementation manner, the blue gray scale value may be gradually decreased in a first proportion as the current temperature value is decreased, and the green gray scale value may be gradually decreased in a second proportion as the current temperature value is decreased. For example, as can be seen in table 1, the first and second ratios are the same. Of course, the first proportion and the second proportion may be different, and specifically, a low-temperature working experiment may be performed according to OLED display screens of different models, and the test results are obtained.
In order to implement the above embodiments, the present application further provides a display control device of an OLED.
Fig. 7 is a schematic structural diagram of a display control device of an OLED according to a third embodiment of the present application.
As shown in fig. 7, the display control apparatus 100 of the OLED includes: temperature sensor 101, processor 102 and timing controller 103.
The temperature sensor 101 is configured to obtain an input gray level value and obtain a current temperature.
And the processor 102 is configured to obtain a corresponding adjustment value of the digital gamma curve DGC according to the current temperature value.
As an example, referring to fig. 4, the processor 102 may be an android main chip RK3288 with ADC functionality.
As a possible implementation manner, the processor 102 stores a preset comparison table, and the processor 102 is specifically configured to: and inquiring a preset comparison table according to the input gray-scale value and the current temperature value to obtain a corresponding DGC adjustment value.
As a possible implementation, the preset reference table is obtained through experiments.
As a possible implementation manner, the blue gray scale value in the preset look-up table is gradually decreased by a first proportion as the current temperature decreases, and the green gray scale value is gradually decreased by a second proportion as the current temperature decreases.
As a possible implementation, the first and second ratios are the same.
And the time sequence controller 103 is used for calculating an output gray scale value according to the input gray scale value and the DGC adjusting value and controlling the OLED according to the output gray scale value.
As a possible implementation manner, the digital gamma curve is a 2.2 gamma curve, the DGC adjustment value is a ^2.2, the input gray level value is x, the output gray level value is y, and the timing controller 103 is specifically configured to: when y corresponds to a brightness of lyEqual to x corresponds to a luminance of LxAccording to the formula l255＝a^2.2*L255And Lx＝(x/255)^2.2*L255And calculating to obtain:
ly＝(y/255)^2.2*l255＝(y/255)^2.2*a^2.2*L255＝[(y/a)/255]^2.2*L255＝Lx；
→y＝ax。
it should be noted that the foregoing explanation of the embodiment of the display control method for an OLED is also applicable to the display control apparatus 100 for an OLED in this embodiment, and is not repeated here.
The display control device of the OLED of this embodiment obtains the input gray-scale value and the current temperature, then obtains the corresponding digital gamma curve DGC adjustment value according to the current temperature value, then calculates the output gray-scale value according to the input gray-scale value and the DGC adjustment value, and finally controls the OLED according to the output gray-scale value. Therefore, according to the current temperature value, the input gray-scale value is compensated, and the problem of OLED color cast at low temperature is solved. In addition, heating glass does not need to be attached to the OLED, the original advantages of the OLED can be kept, and the application scene of the OLED is expanded.
In order to implement the foregoing embodiments, the present application also provides a computer device, including: the display control method of the OLED as proposed in the previous embodiments of the present application is realized by a memory, a processor and a computer program stored on the memory and executable on the processor.
In order to achieve the above embodiments, the present application also proposes a computer-readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the display control method of the OLED as proposed in the foregoing embodiments of the present application.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (9)

1. A display control method of an OLED is characterized by comprising the following steps:
acquiring an input gray scale value and acquiring a current temperature value;
acquiring a corresponding digital gamma curve DGC adjusting value according to the current temperature value;
calculating an output gray level value according to the input gray level value and the DGC adjusting value; and
performing display control on the OLED according to the output gray-scale value;
wherein the digital gamma curve is a 2.2 gamma curve, the DGC adjustment value is a ^2.2, the input gray level value is x, the output gray level value is y, the calculating the output gray level value according to the input gray level value and the DGC adjustment value comprises:
when y corresponds to the brightness lyEqual to the brightness L corresponding to xxAccording to the formula l255＝a^2.2*L255And Lx＝(x/255)^2.2*L255And calculating to obtain:
ly＝(y/255)^2.2*l255＝(y/255)^2.2*a^2.2*L255＝[(y/a)/255]^2.2*L255＝Lx；
y＝ax。
2. the method for controlling display of OLED according to claim 1, wherein the obtaining the corresponding adjustment value of the digital gamma curve DGC according to the current temperature value comprises:
and inquiring a preset comparison table according to the input gray-scale value and the current temperature value to obtain a corresponding DGC adjustment value.
3. The method as claimed in claim 2, wherein the blue gray scale value is gradually decreased at a first rate with a decrease in the current temperature, and the green gray scale value is gradually decreased at a second rate with a decrease in the current temperature in the preset lookup table.
4. The display control method of the OLED according to claim 3, wherein the first ratio and the second ratio are the same.
5. A display control apparatus of an OLED, comprising:
the temperature sensor is used for acquiring an input gray level value and acquiring a current temperature value;
the processor is used for acquiring a corresponding digital gamma curve DGC adjusting value according to the current temperature value;
the time schedule controller is used for calculating an output gray scale value according to the input gray scale value and the DGC adjusting value; controlling the OLED according to the output gray-scale value;
wherein, the digital gamma curve is a 2.2 gamma curve, the DGC adjustment value is a ^2.2, the input gray scale value is x, the output gray scale value is y, and the timing controller is specifically configured to:
when y corresponds to a brightness of lyEqual to x corresponds to a luminance of LxAccording to the formula l255＝a^2.2*L255And Lx＝(x/255)^2.2*L255And calculating to obtain:
ly＝(y/255)^2.2*l255＝(y/255)^2.2*a^2.2*L255＝[(y/a)/255]^2.2*L255＝Lx；
y＝ax。
6. the OLED display control device of claim 5, wherein the processor stores a preset look-up table, and the processor is specifically configured to:
and inquiring the preset comparison table according to the input gray-scale value and the current temperature value to obtain a corresponding DGC adjustment value.
7. The OLED display control device according to claim 6, wherein the blue gray scale value is gradually decreased with a first ratio as the current temperature decreases, and the green gray scale value is gradually decreased with a second ratio as the current temperature decreases in the preset lookup table.
8. The display control apparatus of the OLED according to claim 7, wherein the first ratio and the second ratio are the same.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the display control method of an OLED according to any one of claims 1-4.
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