CN115050326B - Adaptive visible dimming method for OLED (organic light emitting diode) under strong light - Google Patents
Adaptive visible dimming method for OLED (organic light emitting diode) under strong light Download PDFInfo
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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
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses an adaptive visible dimming method for an OLED (organic light emitting diode) under strong light, which comprises the following steps of: s1, obtaining the brightness of environment light; s2, obtaining the image brightness Y of the image of the display device; and S3, based on the gamma curves with different preset intensity levels, strengthening the image brightness so as to exceed the ambient light brightness. Compared with the prior art, the invention has the beneficial effects that: the invention does not need to change the panel design of the OLED; the brightness gray level value can be adaptively adjusted according to the information of the input image, so as to achieve the effect of enhancing the brightness; the gamma curve with better effect can be selected more adaptively according to the distribution of the average brightness of the image, because the gamma curve option is adjusted, the brightness information of the data is not directly influenced, and the color cast tendency is less likely to appear.
Description
Technical Field
The invention relates to the field of OLED, in particular to a brightness self-adaptive dimming method of a display device under strong light.
Background
In order to make the OLED display clearly see the displayed information under strong light, the brightness of the display must be greater than the brightness of the ambient light. To achieve this, two solutions exist.
The method comprises the following steps: the process design of the OLED panel is changed, and the reflection intensity of the ambient light is reduced by adding a polaroid or other panel design technologies, so that the result visible in a strong light environment is achieved. The disadvantage is that the panel design of the OLED needs to be changed, which increases the development time and research cost.
The method 2 comprises the following steps: by enhancing the brightness of the panel light emission to exceed the interference of the ambient light, the visibility of the panel is increased. The disadvantage is that the backlight brightness is adjusted, and then the OLED brightness is controlled by the DBV command, wherein the excessive change of the image brightness is not considered, and the brightness enhancement can have an optimization space, which needs to be improved.
Disclosure of Invention
The invention aims to provide an adaptive visible dimming method for an OLED (organic light emitting diode) under strong light, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an adaptive visible dimming method for an OLED (organic light emitting diode) under strong light is characterized by comprising the following steps:
s1, obtaining the brightness of ambient light;
s2, acquiring the image brightness Y of the image of the display device;
and S3, based on the gamma curves with different preset intensity levels, strengthening the image brightness so as to exceed the ambient light brightness.
Further, the method comprises the steps of obtaining an RGB image of the image, converting the RGB image of the image into a YCbCr image through an RGB2YCbCr module, obtaining image brightness Y corresponding to the RGB image from the YCbCr image, and obtaining image chroma CbCr from the YCbCr image.
Further, the gamma curves with different intensity levels include a plurality of gamma curves corresponding to different brightness levels, and brightness enhancement is performed according to the gamma curves with different intensity levels, so that the brightness of the low-brightness image is greatly enhanced, and the brightness enhancement range of the high-brightness image is smaller, specifically, the brightness of the low-brightness image is enhanced by a first range, and the brightness enhancement range of the high-brightness image is enhanced by a second range, wherein the first range is larger than the second range.
Further, the gamma curve is obtained by curve fitting in a cubic polynomial manner based on preset brightness, and the brightness values of the corresponding pull strengths are different under different preset brightness.
Further, the method further includes step S4, taking the image brightness Y of the image as reference image data, and adjusting the image brightness enhancement ratio based on the brightness average value of the reference image data.
Further, in step S4, the high brightness blurring module adjusts the image brightness enhancement ratio based on the brightness average value.
Further, in step S3, the adaptive video image is synthesized based on the enhanced video luminance Y and the video chrominance CbCr.
Further, in the step S1, the brightness of the environment is manually started by a user or the display device automatically detects the brightness of the environment, a corresponding brightness instruction of the environment is obtained based on the brightness of the environment, a gamma curve corresponding to the brightness instruction is obtained from the multiple gamma curves, the corresponding gamma curve has a corresponding gamma ratio, and the brightness is adjusted based on the corresponding gamma curve.
Further, the display device is an OLED display device, and in step S3, the voltage value or the current value of the OLED in the display device is adjusted based on the corresponding gamma curve to change the brightness of the image of the display device.
Further, in the step S4, the gamma ratio is multiplied by an image brightness value, that is, the DBV value, to obtain average values of different image brightness, and the gamma curve is adjusted based on the average values of different image brightness, so that the DBV ratio is obviously increased when processing image information with low brightness, and the DBV increasing amplitude is small when processing image information with high brightness and under strong light.
Compared with the prior art, the invention has the beneficial effects that: the invention does not need to change the panel design of the OLED, and can adaptively adjust the brightness gray-scale value according to the information of the input image so as to achieve the effect of enhancing the brightness; furthermore, according to the distribution of the average brightness of the image, the gamma curve with better effect is selected more adaptively, and because the gamma curve option is adjusted, the brightness information of the data is not directly influenced, and the color cast tendency is less likely to appear.
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FIG. 1 is a gamma curve for dimming different intensity levels in a display device according to the present invention;
FIG. 2 is a diagram of a data brightness enhancement architecture in accordance with the present invention;
FIG. 3 is a graph of the corresponding gamma curve selected by the DBV control;
FIG. 4 is a scale chart of different luminance average trim DBV values.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1-4, an adaptive visible dimming method for an OLED under strong light includes:
s1, obtaining the brightness of ambient light;
s2, obtaining the image brightness Y of the image of the display device;
and S3, based on the gamma curves with different preset intensity levels, strengthening the image brightness so as to exceed the ambient light brightness.
Through the technical scheme, the adaptive brightness adjustment can be performed on the image information, so that the requirements of different brightnesses, particularly the display under strong light, can be met.
Further, in order to adjust the brightness of the image, it is necessary to know the information of the video image itself, such as brightness and chromaticity, the present invention includes acquiring the RGB video of the video image, specifically as shown in fig. 2, acquiring the RGB2YCbCr which is the image information of the video image itself, that is, the brightness Y and chromaticity Cb and Cr corresponding to RGB, specifically, converting the RGB video of the video into a YCbCr image by the RGB2YCbCr module, acquiring the video brightness Y corresponding to the RGB video from the YCbCr image, further acquiring the video chromaticity CbCr from the YCbCr image, wherein the brightness Y is sent to the SLR data module for processing, specifically, the SLR data module includes a gamma curve fitting part and a strong light synthesizing part, performing curve fitting on the brightness Y by the gamma curve fitting part, and performing strong light synthesis on the fitted curve to strengthen the brightness, and synthesizing the original chromaticity CbCr and the stretched brightness Y to obtain the brightness stretched video, and thus, in step S3, the video image obtained based on the stretched chromaticity is synthesized to the brightness of the stretched chrominance image.
Further, the gamma curves of different intensity levels include a plurality of gamma curves corresponding to different brightness levels, and the brightness enhancement according to the gamma curves of different intensity levels makes the brightness of the image with low brightness increased to a greater extent and the brightness of the image with high brightness increased to a lesser extent, for example, makes the brightness of the image with low brightness increased to a first extent and the brightness of the image with high brightness increased to a second extent, the first extent being greater than the second extent, and in fact the first extent being greater than the second extent; specifically, as shown in fig. 1, a higher proportion of the stretched luminance Yout is obtained after the input luminance Yin of the low luminance region is stretched and the stretched luminance Yout is output, and a lower proportion of the stretched luminance Yout is obtained than the input luminance Yin in the region where the luminance is higher, thereby obtaining the display luminance capable of being adapted to the environmental strong light. Furthermore, in order to obtain a gamma curve for brightness adjustment meeting the above requirements, the present invention creatively sets the gamma curve to be obtained by curve fitting based on a predetermined brightness in a cubic polynomial manner, wherein the brightness values of the corresponding pull strengths are different at different predetermined brightness, and the gamma curve can be obtained better and accurately by curve fitting in the cubic polynomial manner.
Further, the method further includes step S4, taking the image brightness Y of the image as reference image data, and adjusting the image brightness enhancement ratio based on the brightness average value of the reference image data. This is because, in practical applications, the image itself has different brightness, and in the process of adjusting corresponding to different brightness, if the brightness is enhanced by multiple degrees, image details of the image may be lost, which causes image distortion, therefore, the present invention adds a high brightness blurring module, which adjusts the proportion weight of brightness enhancement, and the weight adjusts the proportion of brightness enhancement by referring to the average value of intensity of the image data, so that in step S4, the high brightness blurring module adjusts the proportion of brightness enhancement of the image based on the average value of brightness.
Further, when adjusting under strong light, the brightness adjustment needs to meet the requirement of displaying under strong light, and therefore the intensity of ambient light needs to be known, in step S1, the ambient light brightness is manually detected by a user or a display device automatically detects the ambient light brightness, a corresponding ambient light brightness instruction is obtained based on the ambient light brightness, a gamma curve corresponding to the brightness instruction is obtained from the multiple groups of gamma curves, the corresponding gamma curve has a corresponding gamma proportion, and the brightness adjustment is performed based on the corresponding gamma curve.
Further, in the present invention, the display device is preferably an OLED display device, and more preferably, the display device is an OLED display panel, because the OLED device can rapidly and accurately adjust the brightness, preferably, the current based on the current or the voltage, and in the step S3, the voltage value or the current value of the OLED in the display device is adjusted based on the corresponding gamma curve to change the brightness of the image of the display device. More specifically, by changing the current-voltage value for controlling the brightness of the OLED, different brightness can be obtained, as shown in fig. 3, and the corresponding gamma curve is selected according to the display brightness value DBV, so as to satisfy the dimming requirement.
Further, in the step S4, the gamma ratio is multiplied by the image brightness value, i.e. the DBV value, to obtain different image brightness average values, and the gamma curve is adjusted based on the different image brightness average values, so that the DBV ratio is obviously increased when processing the image information with low brightness, and the DBV increasing amplitude is smaller when processing the image information with high brightness and under strong light, specifically, as shown in fig. 4, the display brightness value DBV is finely adjusted according to the different brightness average values.
Although the present invention uses two adjustment methods, that is, the method of adaptively adjusting the enhanced brightness according to the gray scales of different image brightness and the method of selecting the fine-tuning gamma curve according to the brightness of the image information, the present invention is not limited thereto, and the above-mentioned method can be used alone to perform the dimming, specifically, the method of adaptively adjusting the enhanced brightness according to the gray scales of different image brightness or the method of selecting the fine-tuning gamma curve according to the brightness of the image information, and the two specific adjustment methods have been described in detail above.
In conclusion, the invention does not need to change the panel design of the OLED, and can adaptively adjust the brightness gray-scale value according to the information of the input image, thereby achieving the effect of enhancing the brightness; furthermore, according to the distribution of the average brightness of the image, the gamma curve with better effect is selected more adaptively, and the gamma curve option is adjusted, so that the brightness information of the data is not directly influenced, and the color cast tendency is less prone to appear.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. An adaptive visible dimming method of an OLED (organic light emitting diode) under strong light is characterized by comprising the following steps:
s1, obtaining the brightness of environment light;
s2, obtaining the image brightness Y of the image of the display device;
s3, based on gamma curves with preset different intensity levels, strengthening the image brightness so as to exceed the ambient light brightness;
s4, adjusting the image brightness enhancement ratio based on the brightness average value of the reference image data by taking the image brightness Y of the image as the reference image data;
the step S2 includes obtaining an RGB image of the image, converting the RGB image of the image into a YCbCr image by an RGB2YCbCr module, obtaining an image luminance Y corresponding to the RGB image from the YCbCr image, and obtaining an image chrominance CbCr from the YCbCr image.
2. The adaptive dimming method of OLED under strong light according to claim 1, wherein in step S3, the gamma curves with different intensity levels comprise a plurality of gamma curves corresponding to different brightness levels, and the brightness pull-up according to the gamma curves with different intensity levels is performed such that the brightness of the image with low brightness is increased by a first amplitude and the brightness of the image with high brightness is increased by a second amplitude, wherein the first amplitude is larger than the second amplitude.
3. The adaptive visual dimming method for an OLED under intense light according to claim 1, wherein in step S3, the gamma curve is obtained by curve fitting in a cubic polynomial manner based on preset brightness, and the brightness values of the corresponding pull intensities at different preset brightness are different.
4. The adaptive dimming method for an OLED under strong light according to claim 1, wherein in step S4, the high brightness blurring module adjusts the image brightness enhancement ratio based on the brightness average value.
5. The adaptive dimming method for an OLED under intense light according to claim 1, wherein in step S3, the adaptive video image is synthesized based on the video luminance Y and the video chrominance CbCr after being intensified.
6. The adaptive visual dimming method for an OLED under intense light of claim 1, wherein in step S1, a user manually activates or a display device automatically detects ambient light brightness, a corresponding ambient light brightness command is obtained based on the ambient light brightness, a gamma curve corresponding to the brightness command is obtained from a plurality of gamma curves, the corresponding gamma curve has a corresponding gamma ratio, and brightness adjustment is performed based on the corresponding gamma curve.
7. The adaptive dimming method for OLEDs in high light environment according to claim 6, wherein the display device is an OLED display device, and in step S3, the voltage value or the current value of the OLED in the display device is adjusted based on the corresponding gamma curve to change the brightness of the image of the display device.
8. The method according to claim 4, wherein in step S4, the gamma ratio is multiplied by an image brightness value (DBV) to obtain an average value of different image brightness, and the gamma curve is adjusted based on the average value of different image brightness, so that the DBV ratio is increased significantly when processing image information with low brightness, and the amplitude of increasing DBV is smaller when processing image information with high brightness and under strong light.
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