CN109754761B - Method and device for adjusting electrowetting display brightness along with change of ambient light - Google Patents
Method and device for adjusting electrowetting display brightness along with change of ambient light Download PDFInfo
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Abstract
The invention relates to a method and a device for adjusting electrowetting display brightness along with ambient light change, which measure ambient light in real time, judge whether the current ambient light belongs to a preset range, and adjust the ambient light to the preset range through light source compensation when the ambient light is lower than the preset range; and adjusting the display brightness of the electrowetting device according to the current external environment light and by combining a human eye sensing system. The invention can adjust the brightness of the electrowetting display screen along with the change of the ambient light and can protect human eyes.
Description
Technical Field
The invention relates to the field of battery test, in particular to a method and a device for adjusting electrowetting display brightness along with ambient light change.
Background
In recent years, electronic paper display devices have attracted attention because of their advantages of paper-like appearance, low power consumption, environmental protection, and the like. Compared with electrophoretic electronic paper, electrowetting electronic paper can also achieve high brightness, high contrast, low power consumption, and has a faster response speed than electrophoretic electronic paper, and thus becomes a key research direction of a new generation of electronic paper display.
The electrowetting electronic paper display is a reflective display, and achieves the purpose of displaying by reflecting external ambient light, so that a backlight source is not needed, and the power consumption can be saved. But is more susceptible to ambient light. When the external environment light is dark, the screen of the display is also dark, even the display cannot be displayed; when the external environment light is bright, the display screen is bright. Such a display is easily harmful to human eyes and also limits the range of use of the electrowetting electronic paper display.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for adjusting electrowetting display brightness according to ambient light variation, which can adjust the brightness of an electrowetting display screen according to ambient light variation, and protect human eyes.
The invention is realized by adopting the following scheme: a method for adjusting electrowetting display brightness along with ambient light variation comprises measuring ambient light in real time, judging whether the current ambient light is in a preset range, and adjusting the ambient light to be in the preset range through light source compensation when the ambient light is lower than the preset range; and adjusting the display brightness of the electrowetting device according to the current external environment light and by combining a human eye sensing system.
Further, the adjusting the display brightness of the electrowetting device according to the current external environment light and by combining with a human eye sensing system specifically includes the following steps:
step S1: determining a brightness level L corresponding to a gray level of an image to be displayeddAnd an ambient light threshold a to distinguish between weak ambient light and strong ambient light;
step S2: obtaining human eye visual response R in a standard environment by adopting a human eye perception system formula; the human eye perception system formula is as follows:
in the formula, alpha and beta are constants (usually, values are respectively 0.69 and 5.83);
step S3: obtaining the ambient light A ' at the moment, and calculating the human eye visual response R ' corresponding to the ambient light A ' through a human eye perception system formula:
in the formula (I), the compound is shown in the specification,
the brightness level is the brightness level corresponding to the gray level of the image to be displayed under the ambient light A';
in order to ensure that human eyes obtain the same human eye visual response under different ambient light, R 'is equal to R, and the brightness level corresponding to the gray level of the image to be displayed under the ambient light A' is obtained through a human eye perception system formula
Step S4: looking up the relation curve of display brightness of the electrowetting device to be driven along with the change of ambient light and driving voltage DL-AL-V, and inquiring the brightness level
And the corresponding driving voltage is used for adjusting the display brightness of the electrowetting device by using the inquired driving voltage.
The invention also provides a device based on the method for adjusting the electrowetting display brightness along with the change of the ambient light, which comprises an electrowetting display screen, a main controller unit, a photosensitive unit, a brightness adjusting unit, an image display gray information extracting unit, a driving voltage control unit and a light source compensation unit, wherein the photosensitive unit, the brightness adjusting unit, the image display gray information extracting unit, the driving voltage control unit and the light source compensation unit are electrically connected with the main controller unit;
the photosensitive unit is electrically connected with the main controller unit and used for detecting external environment light and transmitting a detection result to the main controller unit;
the image display gray scale information extraction unit is connected with the main controller unit and is used for extracting gray scale brightness information of a current display image and transmitting the extracted information to the main controller unit;
the light source compensation unit is electrically connected with the main controller unit and is used for controlling the main controller unit to adjust the ambient light to a preset range when the ambient light is lower than the preset range;
the brightness adjusting unit is electrically connected with the main controller unit and used for obtaining control driving voltage according to current external environment light by combining a human eye sensing system;
the driving voltage control unit is electrically connected with the main controller unit and the electrowetting display screen and used for driving the display brightness of the electrowetting display screen according to the control driving voltage input by the main controller unit.
Further, the method for obtaining the control driving voltage according to the current external environment light by combining with a human eye sensing system specifically comprises: the brightness adjusting unit calculates brightness corresponding to gray scale of an image to be displayed under current ambient light by using a human eye sensing system, inquires a relation curve of display brightness of an electrowetting device to be driven along with ambient light and driving voltage DL-AL-V according to the calculated brightness, and finally obtains corresponding driving voltage.
Compared with the prior art, the invention has the following beneficial effects: the invention can adjust the display brightness of the electrowetting display screen according to the brightness of the environment, and can effectively protect human eyes.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention.
Fig. 2 is a schematic block diagram of an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the present embodiment provides a method for adjusting electrowetting display brightness along with ambient light variation, which measures ambient light in real time, determines whether the current ambient light is within a preset range, and adjusts the ambient light to the preset range through light source compensation when the ambient light is lower than the preset range; and adjusting the display brightness of the electrowetting device according to the current external environment light and by combining a human eye sensing system.
In this embodiment, the adjusting the display brightness of the electrowetting device according to the current external environment light and by combining with a Human visual perception system (HVS) specifically includes the following steps:
step S1: determining a brightness level L corresponding to a gray level of an image to be displayeddAnd an ambient light threshold a to distinguish between weak ambient light and strong ambient light; the ambient light threshold a may be obtained through subjective testing, or may be based on a relationship between a perceptual distortion factor (Dist) and a threshold at which human eyes just cause distortion (JND).
Based on the luminance distortion and the contrast distortion, a perceptual distortion factor Dist is defined as:
where d (x, y) represents the perceptual distortion at the pixel (x, y); dist denotes the average of the distortion of all pixels of the whole image, N is the number of pixels of the image, α and β are set to represent the relative importance between the two, where α ═ β ═ 1, and c (x, y) and l (x, y) are set as contrast distortion and luminance distortion.
In the formula, muin(x, y) and μout(x, y) is the average of the (x, y) surrounding pixel points in the indoor and outdoor environments, respectively,in(x, y) andout(x, y) is variance. The ambient light threshold is the light intensity when Dist equals the just-caused distortion (JND) threshold for the human eye.
Step S2: obtaining human eye visual response R in a standard environment by adopting a human eye perception system formula; the human eye perception system formula is as follows:
in the formula, alpha and beta are constants (usually, values are respectively 0.69 and 5.83);
step S3: obtaining the ambient light A ' at the moment, and calculating the human eye visual response R ' corresponding to the ambient light A ' through a human eye perception system formula:
in the formula (I), the compound is shown in the specification,
the brightness level is the brightness level corresponding to the gray level of the image to be displayed under the ambient light A';
in order to ensure that human eyes obtain the same human eye visual response under different ambient light, R 'is R, and the gray level of an image to be displayed under the ambient light A' is obtained through a human eye perception system formulaBrightness level
Step S4: looking up the relation curve of display brightness of the electrowetting device to be driven along with the change of ambient light and driving voltage DL-AL-V, and inquiring the brightness level
And the corresponding driving voltage is used for adjusting the display brightness of the electrowetting device by using the inquired driving voltage.
Wherein the DL-AL-V change relation curve is obtained through experiments or existing experimental data.
As shown in fig. 2, the present embodiment further provides a device based on the method for adjusting electrowetting display brightness along with ambient light change, which includes an electrowetting display screen, a main controller unit, and a photosensitive unit, a brightness adjustment unit, an image display gray scale information extraction unit, a driving voltage control unit, and a light source compensation unit, which are electrically connected to the main controller unit;
the photosensitive unit is electrically connected with the main controller unit and used for detecting external environment light and transmitting a detection result to the main controller unit;
the image display gray scale information extraction unit is connected with the main controller unit and is used for extracting gray scale brightness information of a current display image and transmitting the extracted information to the main controller unit;
the light source compensation unit is electrically connected with the main controller unit and is used for controlling the main controller unit to adjust the ambient light to a preset range when the ambient light is lower than the preset range (the brightness of the display screen during visible brightness);
the brightness adjusting unit is electrically connected with the main controller unit and used for obtaining control driving voltage according to current external environment light by combining a human eye sensing system;
the driving voltage control unit is electrically connected with the main controller unit and the electrowetting display screen and used for driving the display brightness of the electrowetting display screen according to the control driving voltage input by the main controller unit.
In this embodiment, the step of obtaining the control driving voltage according to the current external environment light by combining with a human eye sensing system specifically includes: the brightness adjusting unit calculates brightness corresponding to gray scale of an image to be displayed under current ambient light by using a human eye sensing system, inquires a relation curve of display brightness of an electrowetting device to be driven along with ambient light and driving voltage DL-AL-V according to the calculated brightness, and finally obtains corresponding driving voltage.
Preferably, in this embodiment, the light source compensation unit may adopt any light source to increase the ambient brightness when the ambient light is insufficient.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (3)
1. A method for adjusting electrowetting display brightness along with ambient light variation is characterized in that: measuring the external environment light in real time, judging whether the current external environment light belongs to a preset range, and adjusting the external environment light to the preset range through light source compensation when the external environment light is lower than the preset range; adjusting the display brightness of the electrowetting device according to the current external environment light by combining a human eye sensing system;
the adjusting the display brightness of the electrowetting device according to the current external environment light and by combining with a human eye perception system specifically comprises the following steps:
step S1: determining a brightness level L corresponding to a gray level of an image to be displayeddAnd an ambient light threshold a to distinguish between weak ambient light and strong ambient light;
step S2: obtaining human eye visual response R in a standard environment by adopting a human eye perception system formula; the human eye perception system formula is as follows:
wherein, alpha and beta are constants;
step S3: obtaining the ambient light A ' at the moment, and calculating the human eye visual response R ' corresponding to the ambient light A ' through a human eye perception system formula:
in the formula (I), the compound is shown in the specification,
the brightness level is the brightness level corresponding to the gray level of the image to be displayed under the ambient light A';
in order to ensure that human eyes obtain the same human eye visual response under different ambient light, R 'is equal to R, and the brightness level corresponding to the gray level of the image to be displayed under the ambient light A' is obtained through a human eye perception system formula
Step S4: looking up the relation curve of display brightness of the electrowetting device to be driven along with the change of ambient light and driving voltage DL-AL-V, and inquiring the brightness level
And the corresponding driving voltage is used for adjusting the display brightness of the electrowetting device by using the inquired driving voltage.
2. An apparatus for adjusting the brightness of an electrowetting display based on the method of claim 1, wherein the method comprises: the system comprises an electrowetting display screen, a main controller unit, a photosensitive unit, a brightness adjusting unit, an image display gray scale information extracting unit, a driving voltage control unit and a light source compensation unit, wherein the photosensitive unit, the brightness adjusting unit, the image display gray scale information extracting unit, the driving voltage control unit and the light source compensation unit are electrically connected with the main controller unit;
the photosensitive unit is electrically connected with the main controller unit and used for detecting external environment light and transmitting a detection result to the main controller unit;
the image display gray scale information extraction unit is connected with the main controller unit and is used for extracting gray scale brightness information of a current display image and transmitting the extracted information to the main controller unit;
the light source compensation unit is electrically connected with the main controller unit and is used for controlling the main controller unit to adjust the ambient light to a preset range when the ambient light is lower than the preset range;
the brightness adjusting unit is electrically connected with the main controller unit and used for obtaining control driving voltage according to current external environment light by combining a human eye sensing system;
the driving voltage control unit is electrically connected with the main controller unit and the electrowetting display screen and used for driving the display brightness of the electrowetting display screen according to the control driving voltage input by the main controller unit.
3. The apparatus of claim 2, wherein: the method for obtaining the control driving voltage by combining the human eye sensing system according to the current external environment light specifically comprises the following steps: the brightness adjusting unit calculates brightness corresponding to gray scale of an image to be displayed under current ambient light by using a human eye sensing system, inquires a relation curve of display brightness of an electrowetting device to be driven along with ambient light and driving voltage DL-AL-V according to the calculated brightness, and finally obtains corresponding driving voltage.
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| US9965999B1 (en) * | 2014-06-26 | 2018-05-08 | Amazon Technologies, Inc. | Adjusting display color based on brightness |
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