CN112666731A - Method for evaluating viewing angle of display screen - Google Patents
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Abstract
The invention discloses a visual angle evaluation method of a display screen, and belongs to the technical field of display. The evaluation method comprises the following steps: acquiring a plurality of brightness values and/or a plurality of chromatic values of at least one test picture on a display screen when the test picture is displayed at a plurality of test angles; obtaining at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle, and a black field luminance viewing angle of the display screen based on the plurality of luminance values and/or the plurality of chrominance values; the viewing angle of the display screen is evaluated based on at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle, and a black field luminance viewing angle of the display screen. By adopting the technical scheme of the invention, the change of the picture of the display screen sensed by human eyes along with the watching angle can be reflected more objectively and more accurately from the dimensions of saturation, hue, white field brightness, gray field brightness, black field brightness and the like, so that the visual angle of the display screen can be evaluated correctly.
Description
Technical Field
The invention relates to the technical field of display, in particular to a visual angle evaluation method of a display screen.
Background
The brightness of the general screen display is reduced along with the increase of the visual angle, the brightness and the color effect are best viewed from the right front of the screen, the brightness and the color effect are gradually reduced no matter the screen is deflected in the vertical direction or the horizontal direction, and the brightness and the color effect are reduced to the degree which is not acceptable for a user due to the fact that the visual angle is too large. The viewing angle may be defined as the angle at which a user can clearly view all content on the screen from different directions.
However, in the related art, the method for evaluating the viewing angle of a display device such as a liquid crystal display device is mainly considered from two dimensions of color and white brightness, and the evaluation is not accurate.
Disclosure of Invention
The invention mainly aims to provide a visual angle evaluation method of a display screen, and aims to solve the technical problem that the visual angle evaluation method in the prior art cannot correctly evaluate the visual angle of the display screen.
In order to achieve the above object, the present invention provides a method for evaluating a viewing angle of a display screen, comprising:
acquiring a plurality of brightness values and/or a plurality of chromatic values of a test picture on a display screen when the test picture is displayed at a plurality of test angles;
obtaining at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle, and a black field luminance viewing angle of the display screen based on the plurality of luminance values and/or the plurality of chrominance values;
the viewing angle of the display screen is evaluated based on at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle, and a black field luminance viewing angle of the display screen.
Optionally, the test pictures include a red test picture, a green test picture and a blue test picture which are displayed in sequence;
the step of obtaining a saturation viewing angle and a hue viewing angle of the display screen based on the plurality of luminance values and/or the plurality of chrominance values includes:
generating a saturation value and a hue value of a test picture in an LCH color space diagram at any angle according to the brightness value and the chroma value obtained at any test angle;
screening a plurality of qualified saturation values from the plurality of saturation values according to a preset qualified saturation value, and screening a plurality of qualified hue values from the plurality of saturation values according to a preset qualified hue value;
and setting the maximum angle in the plurality of test angles corresponding to the plurality of qualified saturation values as the saturation viewing angle of the display screen, and setting the maximum angle in the plurality of test angles corresponding to the plurality of qualified hue values as the hue value viewing angle of the display screen.
Optionally, the red test picture, the green test picture and the blue test picture are all displayed in a partial area of the display screen.
Optionally, the step of generating a saturation value and a hue value of the test picture in the LCH color space diagram at any angle according to the luminance value and the hue value obtained at any test angle includes:
converting the brightness value and the chromatic value obtained at any test angle to obtain a tristimulus value of the test picture at any angle;
converting the tri-stimulus value of the test picture at any angle to obtain a Lab value;
according to the Lab value, the conversion obtains the saturation value and the hue value of the test picture in the LCH color space diagram at any angle.
Optionally, the test picture is a full black picture, and the test picture is displayed on the display screen in a full screen manner;
the step of obtaining a black field luminance viewable angle of the display screen based on the plurality of luminance values comprises:
taking the brightness value obtained when the test angle is 0 degrees as a first brightness value;
screening a second brightness value from the plurality of brightness values, wherein a first preset condition is satisfied between the value of the second brightness value and the value of the first brightness value;
and taking the test angle corresponding to the second brightness value as the black field brightness visual angle of the display screen.
Optionally, the first preset condition is:
the value of the second luminance value is twice the value of the first luminance value.
Optionally, the test picture is a full white picture, and the test picture is displayed on the display screen in a full screen manner;
the step of obtaining the white field brightness visual angle of the display screen based on the plurality of brightness values comprises the following steps:
taking the brightness value obtained when the test angle is 0 degrees as a third brightness value;
screening a fourth brightness value from the plurality of brightness values, wherein a second preset condition is met between the value of the fourth brightness value and the value of the third brightness value;
and taking the test angle corresponding to the third brightness value as the white field brightness visual angle of the display screen.
Optionally, the second preset condition is:
the value of the fourth luminance value is 75% of the value of the third luminance value.
Optionally, the test picture includes a plurality of gray pictures with different gray scales, wherein the gray scale values of the plurality of gray pictures are in an arithmetic progression, and the test picture is displayed on the display screen in a full screen mode in sequence;
the step of obtaining a gray field luminance viewable angle of the display screen based on the plurality of luminance values comprises:
determining any gray picture in the gray pictures with different gray scales as an ideal test picture;
screening out a plurality of first ideal brightness values obtained by displaying an ideal test picture at a test angle of 0 degrees from the plurality of brightness values, and screening out a plurality of second ideal brightness values obtained by displaying the rest pictures at the test angle of 0 degrees from the plurality of different gray-scale pictures;
calculating to obtain a plurality of theoretical brightness values of the residual pictures when the residual pictures are displayed at a plurality of test angles based on the first ideal brightness value and the second ideal brightness value;
screening a target brightness value from the residual brightness values in the plurality of brightness values, wherein the target brightness value and the corresponding theoretical brightness value meet a fourth preset condition;
and taking the minimum angle in the plurality of test angles corresponding to the target brightness value as the gray field brightness visual angle of the display screen.
Optionally, the fourth preset condition is:
the deviation value before the target luminance value and the theoretical luminance value is greater than or equal to 3%.
According to the technical scheme, the brightness value and/or the chromatic value obtained by the test picture are/is processed to obtain at least one of a saturation visual angle, a hue visual angle, a white field brightness visual angle, a gray field brightness visual angle and a black field brightness visual angle, so that the change of the picture of the display screen sensed by human eyes along with the viewing angle can be reflected more objectively and accurately through at least one dimension of the saturation, the hue, the white field brightness, the gray field brightness, the black field brightness and the like, and the visual angle and the display effect of the display screen can be evaluated more accurately.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a visibility measuring device required by the method for evaluating visibility of a display screen according to the present invention;
FIG. 2 is a schematic deflection diagram of a visibility measuring apparatus according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for assessing visibility of a display screen according to a first embodiment of the present invention;
FIG. 4 is a flowchart illustrating a second embodiment of a method for assessing the visibility of a display screen according to the present invention;
FIG. 5 is a flowchart illustrating a method for assessing visibility of a display screen according to a third embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for assessing visibility of a display screen according to a fourth embodiment of the present invention;
FIG. 7 is a flowchart illustrating a fifth embodiment of a method for assessing the visibility of a display screen according to the present invention;
FIG. 8 is a deflection diagram of a visibility measuring device according to another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the related art, the viewing angle of a display device is generally characterized by color and white field brightness. Among them, the current color viewing angle measurement is established in the CIE1931 xy color or the CIE 1976uv color space. The CIE1931 color space is not a uniform color space, and variations in xy coordinates do not properly describe the variations in subjective perception of the human eye. The CIE 1976uv color space, although a uniform color space, Δ u 'v' does not accurately describe the change in color. And, in addition to color, brightness should also be an important criterion for the determination of the viewing angle. The luminance visibility angle herein does not refer to only the white field luminance visibility angle, but this is only one aspect thereof. However, the ability of the display device to display black and gray fields can also be important, after all when the display device is in use, instead of displaying a white field picture all the time.
Therefore, the embodiment of the invention provides a visual angle evaluation method of a display screen, which measures the change of a picture of the display screen perceived by human eyes along with the viewing angle through multiple dimensions such as saturation, hue, white field brightness, gray field brightness, black field brightness and the like, so that the visual angle of the display screen can be evaluated more scientifically and reasonably, and the display effect of the display screen can be evaluated.
The inventive concepts of the present application are further described below in conjunction with the following figures and the detailed description.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for evaluating a viewing angle of a display screen according to a first embodiment of the present invention.
The method provided by the invention is suitable for screens such as liquid crystal display screens, laser display screens, OLED (organic light emitting diode) and the like, but is not limited to the display equipment.
In this embodiment, the evaluation method includes the following steps;
step S100, acquiring a plurality of brightness values and/or a plurality of chromatic values of at least one test picture on a display screen when the test picture is displayed at a plurality of test angles.
Specifically, in this step, the display screen is a display interface of the display device, and the test picture may be different pictures according to different scenes, such as a full black picture, a full white picture, or a gray picture with different gray scales, or may be an R, G or B monochrome picture. And the measurement picture can be displayed in a full screen mode, and can also be displayed in a window mode in the central portion of the display screen.
Wherein, the acquired brightness value and/or chromatic value can be obtained in a visual angle measurement experiment. For ease of understanding, a specific embodiment is shown:
referring to fig. 1, the device for measuring the viewing angle of a display screen includes a mounting platform 100 and a measuring platform 200, wherein the mounting platform 100 is used for mounting a display device 300 to be tested, and the measuring platform 200 is used for mounting a measuring device 400 such as a spectrometer and/or a colorimeter. The spectrometer is used for measuring brightness data, namely a brightness value L, when the test picture is displayed on the display equipment, the colorimeter is used for measuring the number of chromaticity values when the test picture is displayed on the display equipment, and the colorimeter outputs an x value and a y value in a CIE1931 xy color space.
And either the mounting platform 100 or the measuring platform 200 may be rotated on a horizontal plane with the center of the display screen as the center of the circle. For example, referring to FIG. 2, the mounting platform 100 remains stationary and the measurement platform 200 rotates in a horizontal plane centered on the center of the display screen. Alternatively, in another embodiment, the mounting platform 100 rotates while the measuring platform 200 is stationary, and referring to fig. 8, after the display device 300 is fixedly mounted on the mounting platform 100, the center of the display screen is located on the rotation axis of the mounting platform 100. The mounting platform 100 is kept stationary and the measuring platform 200 is rotated for further explanation.
And the spacing between the measuring platform 200 and the mounting platform 100 is adjustable. Alternatively, the pitch is generally determined according to the size of the display screen, for example, the pitch may be 1.5 times the diagonal size of the display screen. The spectrometer and colorimeter on the measurement platform 200 are both aligned to the exact center of the display screen. .
Referring to fig. 2, when performing the visual angle measurement of the display device, first, the measurement devices such as the spectrometer and the colorimeter are placed right in front of the display device and aligned with S in the center of the display screen0The state at this time was measured and recorded while keeping the display device 300 still, at which the measurement angle was 0 °. With the display screen as the center of circle, willThe measuring platform 200 and the measuring device 400 are horizontally deflected to the left to S1Position or deflection by one step to the right to S2Position, step size per step is 1 °. If the measuring platform is deflected from 0 deg. to the right to the +1 deg. position, the state at this time is measured and recorded. The measurement platform is then deflected further to the right by one step, the state at this point is measured and recorded until +90 ° is reached, and then the measurement is continued from 0 ° to-90 °. I.e. a number of measurement angles lying between-90 deg. and +90 deg., and adjacent measurement angles differing by 1 deg..
It is worth mentioning that all the devices need to be aged at normal temperature for 10-20min before measurement, so as to ensure that the devices are in a stable state during measurement. Particularly, the self-luminous display device such as the OLED needs to be aged after each switching of a test picture.
Step S200, obtaining at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle and a black field luminance viewing angle of the display screen based on the plurality of luminance values and/or the plurality of chrominance values.
In this step, by further processing the obtained luminance value and the obtained chromaticity value, at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle, and a black field luminance viewing angle of the display screen can be obtained.
Step S300, based on at least one of the saturation visual angle, the hue visual angle, the white field brightness visual angle, the gray field brightness visual angle and the black field brightness visual angle of the display screen, the visual angle of the display screen is evaluated.
The step evaluates the display effect of the display screen according to the obtained saturation visual angle, hue visual angle, white field brightness visual angle, gray field brightness visual angle and black field brightness visual angle, wherein the specific evaluation can be whether the visual angle of the display device meets the related standard or not, and whether the visual angle of the display screen meets the change of the human eye feeling along with the change of the viewing angle or not.
In this embodiment, the change of the picture of the display screen perceived by the human eyes along with the viewing angle can be reflected more objectively and more accurately from at least one dimension such as saturation, hue, white field brightness, gray field brightness, black field brightness, and the like, and then the change can be used as a reference standard for improving the display effect of the display device and the user experience. When multiple dimensions are evaluated simultaneously, the change condition of the picture of the display screen perceived by human eyes along with the watching angle can be evaluated more comprehensively, so that the user experience is improved.
Based on the first embodiment of the present invention, a second embodiment of the evaluation method of the present invention is proposed. Referring to fig. 4, fig. 4 is a schematic flow chart of the present embodiment.
In this embodiment, the evaluation method evaluates the viewing angle of the display screen from 2 dimensions of saturation and hue. The test pictures include three test pictures of R (191, 0, 0), G (0, 191, 0) and B (0, 0, 191). And outputting the signals of the three test pictures on a display screen in sequence on a measuring device, and measuring in sequence to obtain corresponding brightness values and chromatic values.
And optionally, the red test picture, the green test picture and the blue test picture are all displayed in partial areas of the display screen. Namely, three test pictures of R (191, 0, 0), G (0, 191, 0) and B (0, 0, 191) are displayed in a window form at the midpoint of the display screen, not in a full screen. And the window is located at the very center of the display screen.
In this embodiment, step S200 of the evaluation method includes the following steps:
and step S211, generating a saturation value and a hue value of the test picture in the LCH color space diagram at any angle according to the brightness value L and the chroma values x and y obtained at any test angle.
Specifically, the luminance value L and the chrominance values x and y measured at any test angle can be converted into the saturation value C and the chrominance value h of the test picture in the LCH color space diagram in the following manner. At this time, step S201 includes the steps of:
(a) and converting the luminance value L and the chromatic values x and y obtained at any test angle to obtain the tristimulus value X, Y, Z of the test picture at any angle.
Wherein the tristimulus values are X, Y, Z values under CIE1931 color space, and can be obtained through the following formulas respectively:
X＝x×L/y；
Y＝L；
Z＝(1-x-y)×L/y。
(b) and converting the tristimulus values of the test pictures at any angle to obtain Lab values.
This step converts the tristimulus values to Lab values. L included in the Lab value in the Lab color space*Is brightness, a*And b*Are two color channels, each of which can be derived by the following equation:
wherein, it is made
Or
Parameters in the above 3 formulas
And
it is involved that the function f (x) satisfies the following condition:
And when the angle of view of the measuring instrument (the range of the field of view of the measuring device) is less than or equal to 4 DEG, Xn＝95.04，Yn＝100.00，Zn108.88. When the angle of view of the test instrument is larger than 4 degrees, Xn＝94.81，Yn＝100.00，Zn＝107.32。
(c) Converting to obtain the saturation value c of the test picture in the LCH color space diagram at any angle according to the Lab value*And a hue value h.
Wherein the saturation value c*And hue value h can be obtained by the following formulas, respectively:
wherein when a*> 0 and b*When the value is more than 0, delta is 0;
when a is*When < 0, delta is 180;
when a is*> 0 and b*When < 0, Δ is 360.
In the step, the saturation values c corresponding to the brightness values and the chromatic values measured by all the test angles at intervals of 1 degree from-90 degrees to 90 degrees of each test picture can be obtained*And a hue value h.
And S212, screening a plurality of qualified saturation values from the plurality of saturation values according to a preset qualified saturation value, and screening a plurality of qualified hue values from the plurality of saturation values according to a preset qualified hue value.
In this step, the preset qualified saturation value may be determined to be 80%, so that all saturation values c converted from step S201*And screening out qualified saturation values with all saturation degrees of more than 80% from the hue values h.
And determines the preset qualified hue value to be 3 deg., so that all the saturation values c converted from step S201*And screening all qualified hue values with the hue values less than 80% from the hue values h.
Step S213 sets the maximum angle of the plurality of test angles corresponding to the plurality of qualified saturation values as the saturation viewing angle of the display screen, and sets the maximum angle of the plurality of test angles corresponding to the plurality of qualified hue values as the hue value viewing angle of the display screen.
And after all the qualified saturation values are screened out, the corresponding measuring angles can be obtained, and because a plurality of measuring angles can be used for obtaining the qualified saturation values, the maximum angle can be set as the saturation visual angle of the display screen. And it is easy to understand that the measurement angle is-90 to +90, and in the rectangular coordinate system, the sign of the angle only represents the rotation direction of the side, but not the magnitude. Thus, the maximum angle may be either positive or negative. And the viewing angle of the display screen is generally left-right symmetric, so that only one maximum angle is obtained.
It should be noted that, in the present embodiment, both the hue angle viewing angle and the saturation angle viewing angle may be the same or different.
The saturation viewing angle represents the variation of the shade of the color with respect to the viewing angle. A device with a large saturation viewing angle may ensure that the viewer sees a shade of color at large and small angles, such as a bright red, from the front, or a bright red rather than a light red from the side. The hue visibility angle indicates a change in color depending on a viewing angle. The device with large visual angle of tone can ensure that the color seen by the observer at large angle and small angle is the same color, such as positive red when viewed from the front, or positive red when viewed from the side instead of pink or purple.
In this embodiment, the luminance values and the chrominance values of three test pictures R (191, 0, 0) G (0, 191, 0) B (0, 0, 191) at a plurality of measurement angles from-90 ° to +90 ° are obtained by measurement, and the color viewing angle is evaluated from two dimensions of saturation and hue on the basis of the Lch color space, so as to more accurately reflect or measure the change of the human eye perception picture along with the viewing angle.
Based on the first embodiment of the present invention, a third embodiment of the evaluation method of the present invention is proposed. Referring to fig. 5, fig. 5 is a schematic flow chart of the evaluation method of the present invention.
In this embodiment, the evaluation method evaluates the viewing angle of the display screen from the dimension of the black field brightness. Wherein, the test picture is a full black picture. And outputting the signal of the full-black test picture in a full screen mode on a display screen, and measuring to obtain a corresponding brightness value.
Step S200 now includes:
step S222, taking the brightness value obtained when the test angle is 0 degrees as a first brightness value L0。
In step S223, a second luminance value L' is selected from the plurality of luminance values, wherein a first preset condition is satisfied between the value of the second luminance value and the value of the first luminance value.
Optionally, as an option of this embodiment, the first preset condition is: the value of the second luminance value is twice the value of the first luminance value. I.e. L ═ 2L0。
Step S224, the test angle corresponding to the second brightness value is used as the black field brightness visual angle of the display screen.
In this embodiment, the luminance value at the test angle of 0 ° is used as the reference, i.e., the first luminance value L0Then the measuring device is deflected to the left or to the right by one step, and the deflection is continued after the brightness value is measured. In the process, the brightness of the display screen displayed by the full black screen is gradually increased, and when the brightness of the black field is doubled, the measured brightness value is the second brightness value L', and the measured angle is the black field brightness visual angle. And the visual angle of the display screen is generally bilaterally symmetrical, so that the black field brightness visual angle can select brightness value data from 0 degrees to 90 degrees or brightness value data from 0 degrees to-90 degrees.
In this embodiment, the viewing angle of the display device for displaying the black field is described by the black field brightness viewing angle. And is different from the contrast of the display screen, which measures the ability to display black when looking straight. The black field brightness viewing angle can more accurately reflect the black field condition seen by the observer from a large angle.
A fourth embodiment of the evaluation method of the present invention is proposed based on the first to second embodiments of the present invention. Referring to fig. 6, fig. 6 is a schematic flow chart of the evaluation method of the present invention.
In this embodiment, the evaluation method evaluates the viewing angle of the display screen from the dimension of the white field brightness. Wherein, the test picture is a full white picture. And outputting the signal of the full-white test picture in a full screen mode on a display screen, and measuring to obtain a corresponding brightness value.
Step S200 now includes:
step S231, using the brightness value obtained when the test angle is 0 degree as the third brightness value L1。
Step S231, selecting a fourth luminance value L 'from the plurality of luminance values, wherein the value of the fourth luminance value L' and the third luminance value L1Satisfies a second predetermined condition.
Optionally, as an option of this embodiment, the second preset condition is: the value of the fourth luminance value is 75% of the value of the third luminance value. I.e., L ″ -0.75L1。
Step S231, using the test angle corresponding to the third brightness value as the white field brightness visible angle of the display screen.
In this embodiment, the brightness value at the test angle of 0 ° is used as the reference, i.e., the third brightness value L1Then the measuring device is deflected to the left or to the right by one step, and the deflection is continued after the brightness value is measured. In the process, the brightness of the display screen of the white field display is gradually reduced, and when the brightness of the white field is reduced to L1And when the brightness value is 75%, the measured brightness value is the fourth brightness value L', and the measured angle is the white field brightness visual angle. And the visual angle of the display screen is generally bilaterally symmetrical, so that the white field brightness visual angle can be selected from the brightness value data from 0 degrees to 90 degrees or the brightness value data from 0 degrees to-90 degrees.
Due to the directionality of the screen, the brightness of the image varies with the viewing angle. In the present embodiment, the effect of the brightness change of the display device on the human eye perception is described by the white field brightness viewing angle.
A fifth embodiment of the evaluation method of the present invention is proposed based on the first to fourth embodiments of the present invention. Referring to fig. 7, fig. 7 is a schematic flow chart of a fifth embodiment of the evaluation method of the present invention.
In this embodiment, the evaluation method evaluates the viewing angle of the display screen from the dimension of gray field brightness. The test picture comprises a plurality of gray pictures with different gray scales, wherein the gray scale values of the gray pictures are in an arithmetic progression, and the test pictures are displayed on the display screen in a full screen mode in sequence. In this embodiment, the five test pictures can be sequentially output and displayed at the test angle of 0 degree, the measurement is performed to obtain the brightness value, then the measurement platform continues to deflect by 1 degree, and the five test pictures are sequentially output and displayed again until the measurement angles are completely measured from-90 degrees to 90 degrees.
As an option of this embodiment, the test pictures include a total of five: 0% gray level picture (full white), 20% gray level picture, 40% gray level picture, 60% gray level picture, 80% gray level picture.
In this embodiment, step S200 includes:
step S241, determining any gray picture of the gray pictures with different gray scales as an ideal test picture.
The gray field brightness visual angle is a measure of the brightness visual angle under different gray scales, and describes the deviation degree between the Gamma curve and the ideal Gamma curve under different gray scales. Therefore, any gray picture in the gray pictures with different gray scales is determined as an ideal test picture, and the gray scale installation state measured when the measurement angle of the ideal test picture is 0 degrees is the ideal Gamma curve of the display screen.
As an alternative to this embodiment, the ideal test picture may be a 0% gray scale picture.
Step S242, a plurality of first ideal luminance values obtained by displaying the ideal test picture at the test angle of 0 ° are screened out from the plurality of luminance values, and a plurality of second ideal luminance values obtained by displaying the remaining pictures in the plurality of different grayscale pictures at the test angle of 0 ° are screened out.
For example, the measured brightness value of the 0% gray scale picture at 0 ° may be screened out, where the brightness value is the first ideal brightness value, and the brightness values of the 20% gray scale picture, the 40% gray scale picture, the 60% gray scale picture, and the 80% gray scale picture at 0 ° may be screened out, where the brightness value is the second ideal brightness value. Namely, the brightness data of the full-gray display screen measured by the measuring device when the full-gray display screen is just opposite to the display screen and different gray scales are displayed.
Step S243, calculating a plurality of theoretical brightness values of the remaining pictures when the remaining pictures are displayed at a plurality of test angles based on the first ideal brightness value and the second ideal brightness value.
In this step, since those skilled in the art know that the gray levels are proportional to the brightness, the theoretical brightness of different gray levels can be calculated according to any one of the gray levels. Therefore, theoretical brightness values theoretically measured when the residual pictures are displayed at a plurality of test angles can be calculated and obtained based on the first ideal brightness value and the second ideal brightness value. For example, after obtaining the luminance value of the 0% gray scale picture at 0 °, and the respective luminance values of the 20%, 40%, 60%, and 80% gray scale pictures at 0 °, the theoretical luminance value of the 20%, 40%, 60%, and 80% gray scale pictures at 0 ° to 90 °, or at any measurement angle between 0 ° and-90 ° can be obtained by calculation.
Step S244, a target brightness value is screened from the remaining brightness values in the plurality of brightness values, and a fourth preset condition is satisfied between the target brightness value and the corresponding theoretical brightness value.
As an option of this embodiment, the fourth preset condition is: the deviation value before the target luminance value and the theoretical luminance value is greater than or equal to 3%.
By comparing a plurality of brightness values obtained by actual measurement with a corresponding theoretical value, namely a theoretical brightness value, a target brightness value meeting a preset condition can be screened out, namely, the deviation between the two brightness values is 3%.
Step S245, the minimum angle of the plurality of test angles corresponding to the target brightness value is used as the gray-field brightness visual angle of the display screen.
And the visual angle of the display screen is generally bilaterally symmetrical, so that the gray field brightness visual angle can be selected from the brightness value data from 0 degrees to 90 degrees or the brightness value data from 0 degrees to-90 degrees. Thus, the measuring platform can start measuring from 0 ° during the test and then step-deflect one step to the left and measure again up to-90 °. Therefore, the minimum angle of the plurality of test angles corresponding to the target brightness value can be used as the gray-field brightness visual angle of the display screen, i.e., the angle deflected by 3% at the earliest, which is the gray-field brightness visual angle. In this embodiment, the gray field visual angle is a measure of the luminance visual angle at different gray scales, and describes the deviation degree between the Gamma curve and the ideal Gamma curve at different gray scales. The gray-scale brightness visual angle is obtained by the angle when the actual Gamma curve deviates 3% from the ideal Gamma curve, so that the visual angle of the display screen can be more comprehensively and accurately evaluated by standing in the dimension of gray-scale brightness.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for assessing the viewing angle of a display screen, comprising:
acquiring a plurality of brightness values and/or a plurality of chromatic values of at least one test picture on a display screen when the test picture is displayed at a plurality of test angles;
obtaining at least one of a saturation viewing angle, a hue viewing angle, a white field luminance viewing angle, a gray field luminance viewing angle, and a black field luminance viewing angle of the display screen based on a plurality of the luminance values and/or a plurality of the chrominance values;
evaluating a viewing angle of the display screen based on at least one of a saturation viewing angle, a hue viewing angle, a white field brightness viewing angle, a gray field brightness viewing angle, and a black field brightness viewing angle of the display screen.
2. The evaluation method according to claim 1, wherein the test pictures include a red test picture, a green test picture, and a blue test picture which are sequentially displayed;
the step of obtaining a saturation viewing angle and a hue viewing angle of the display screen based on the plurality of luminance values and/or the plurality of chrominance values includes:
generating a saturation value and a hue value of the test picture in an LCH color space diagram at any angle according to the brightness value and the chroma value obtained at any test angle;
screening a plurality of qualified saturation values from the plurality of saturation values according to a preset qualified saturation value, and screening a plurality of qualified hue values from the plurality of saturation values according to a preset qualified hue value;
and setting the maximum angle in a plurality of test angles corresponding to the qualified saturation values as the saturation viewing angle of the display screen, and setting the maximum angle in a plurality of test angles corresponding to the qualified hue values as the hue value viewing angle of the display screen.
3. The evaluation method according to claim 2, wherein the red test picture, the green test picture, and the blue test picture are all shown in a partial area of the display screen.
4. The method according to claim 2, wherein the step of generating the saturation value and the hue value of the test picture in the LCH color space map at any one test angle according to the luminance value and the hue value obtained at the any test angle comprises:
converting the brightness value and the chromatic value obtained at any test angle to obtain a tristimulus value of the test picture at any angle;
converting the tristimulus values of the test picture at any angle to obtain Lab values;
and converting to obtain the saturation value and the hue value of the test picture in the LCH color space map at any angle according to the Lab value.
5. The evaluation method according to claim 1, wherein the test picture is a completely black picture, and the test picture is displayed on the display screen in a full screen;
the step of obtaining the black field brightness visual angle of the display screen based on a plurality of the brightness values comprises:
taking the brightness value obtained when the test angle is 0 degrees as a first brightness value;
screening a second brightness value from a plurality of brightness values, wherein a first preset condition is met between the value of the second brightness value and the value of the first brightness value;
and taking the test angle corresponding to the second brightness value as the black field brightness visual angle of the display screen.
6. The evaluation method according to claim 5, wherein the first preset condition is:
the value of the second luminance value is twice the value of the first luminance value.
7. The evaluation method according to claim 1, wherein the test picture is a full white picture and the test picture is shown full screen on the display screen;
the step of obtaining a white field brightness visual angle of the display screen based on a plurality of the brightness values comprises:
taking the brightness value obtained when the test angle is 0 degrees as a third brightness value;
screening a fourth brightness value from the plurality of brightness values, wherein a second preset condition is met between the value of the fourth brightness value and the value of the third brightness value;
and taking the test angle corresponding to the third brightness value as the white field brightness visual angle of the display screen.
8. The evaluation method according to claim 7, wherein the second preset condition is:
the value of the fourth luminance value is 75% of the value of the third luminance value.
9. The evaluation method according to claim 1, wherein the test picture comprises a plurality of gray pictures with different gray scales, wherein gray scale values of the plurality of gray pictures are in an arithmetic progression, and the test pictures are sequentially displayed on the display screen in a full screen manner;
based on a plurality of the brightness values, the step of obtaining a gray field brightness viewable angle of the display screen comprises:
determining any gray picture in the gray pictures with different gray scales as an ideal test picture;
screening out a plurality of first ideal brightness values obtained by displaying the ideal test picture at a test angle of 0 degrees from the plurality of brightness values, and screening out a plurality of second ideal brightness values obtained by displaying the rest pictures in the plurality of different gray-scale pictures at the test angle of 0 degrees;
calculating to obtain a plurality of theoretical brightness values of the residual pictures when the residual pictures are displayed at a plurality of test angles based on the first ideal brightness value and the second ideal brightness value;
screening out a target brightness value from the remaining brightness values in the plurality of brightness values, wherein the target brightness value and the corresponding theoretical brightness value meet a fourth preset condition;
and taking the minimum angle in the plurality of test angles corresponding to the target brightness value as the gray field brightness visual angle of the display screen.
10. The evaluation method according to claim 9, wherein the fourth preset condition is:
the deviation value between the target luminance value and the theoretical luminance value is greater than or equal to 3%.
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