Display screen contrast constant method, display screen and storage medium

Abstract

The embodiment of the invention relates to the technical field of display screens, and discloses a display screen contrast constant method, a display screen and a storage medium. The method comprises the following steps: acquiring ambient illuminance; when it is detected that the ambient illuminance changes, the current illuminance is obtained; determining a corresponding backlight brightness curve based on the corresponding relationship between the current illuminance and the target white field brightness; and adjusting a backlight setting value based on the backlight brightness curve so as to enable the contrast ratio of the display screen to be constant. The backlight brightness curve is obtained through calculation according to the test illuminance, the total reflection coefficient of the glass cover plate of the display screen, the contrast ratio of the display screen and the display parameters, the contrast ratio of the display screen is the ratio of the target white field brightness to the target black field brightness, and therefore the backlight setting value can be adjusted based on the backlight brightness curve, and the display quality is improved. The contrast of the display screen is kept constant, the contrast of the display screen under different ambient illuminance is consistent, and the readability of a user to the display screen can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of display screens, and in particular to a method for maintaining constant contrast of a display screen, a display screen, and a storage medium. Background Art

[0002] Current LCD screens perform differently under different ambient light intensities. For example, in a dark room, the contrast can be maintained at a relatively comfortable viewing level for the human eye. However, in the presence of ambient light, the LCD screen appears white, and the human eye has to work very hard to see the fonts and images on the screen.

[0003] However, the practice in the prior art is to set the contrast ratio as the ratio of the maximum brightness (pure white screen) and the minimum brightness (pure black screen) of the test display screen in a dark room, ignoring the reflected brightness of the ambient light on the screen, and not considering the reflected brightness of the ambient light on the screen when adjusting the backlight value. The resulting display contrast may not be able to adapt to the changing ambient light illumination, thereby affecting the user's readability of the display screen. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a method for maintaining a constant contrast of a display screen, a display screen, and a storage medium. When the ambient light intensity changes, the contrast of the display screen is kept constant by adjusting the backlight setting value, thereby improving the readability of the display screen for users.

[0005] To solve the above technical problems, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a method for maintaining constant contrast of a display screen, the method comprising:

[0007] Get the ambient light intensity;

[0008] When a change in the ambient light intensity is detected, obtaining the current light intensity;

[0009] Based on the corresponding relationship between the current light illuminance and the target white field brightness, a corresponding backlight brightness curve is determined; wherein the backlight brightness curve is calculated based on a plurality of test light illuminances, a total reflection coefficient of a glass cover of a display screen, a display screen contrast, and display parameters, and the display screen contrast is a ratio between the target white field brightness and the target black field brightness;

[0010] Based on the backlight brightness curve, a backlight setting value is adjusted to make the contrast of the display screen constant.

[0011] In some embodiments, the method further comprises:

[0012] Calculate multiple test white field brightnesses based on multiple test light illuminances, the total reflection coefficient of the glass cover of the display screen, the first white field brightness, the second white field brightness, the first black field brightness, the second black field brightness, and the contrast of the display screen;

[0013] Based on multiple test white field brightness, a control bar brightness curve relationship of the display screen is obtained;

[0014] The determining of a corresponding backlight brightness curve based on the corresponding relationship between the current light illumination and the target white field brightness includes:

[0015] The corresponding first test white field brightness and the relationship between the control bar brightness curve corresponding to the first test white field brightness are determined according to the current light illumination to determine the backlight brightness curve.

[0016] In some embodiments, adjusting the backlight setting value based on the backlight brightness curve includes:

[0017] Determining the backlight setting value based on the backlight brightness curve, the maximum backlight setting value and the minimum backlight setting value of the display screen;

[0018] The display screen is controlled to display at the backlight setting value.

[0019] In some embodiments, the target black field brightness is calculated based on the target white field brightness, the current illuminance, the total reflection coefficient, the first white field brightness, the second white field brightness, the first black field brightness, the second black field brightness and the display screen contrast.

[0020] In some embodiments, the first white field brightness is the white field brightness when the backlight setting value is adjusted to 100%, the second white field brightness is the white field brightness when the backlight setting value is adjusted to 0%, the first black field brightness is the black field brightness corresponding to the backlight setting value being adjusted to 100%, the second black field brightness is the white field brightness when the backlight setting value is adjusted to 0%, the maximum value of the backlight setting is 255, and the minimum value of the backlight setting is 0.

[0021] In some embodiments, there is a linear relationship between the backlight setting value and the first test white field brightness, and is calculated based on the backlight setting value, the backlight setting maximum value, the backlight setting minimum value, the first white field brightness, and the second white field brightness.

[0022] In some embodiments, before obtaining the ambient light illumination, the method further includes:

[0023] Turn on the eye protection mode, wherein in the eye protection mode, the contrast of the display screen remains constant.

[0024] In some embodiments, obtaining the current light intensity includes:

[0025] The current light level is obtained through the ambient light sensor based on the internal protocol.

[0026] In a second aspect, the present application further provides a display screen, the display screen comprising:

[0027] An ambient light sensor, a display screen body, at least one processor, and a memory, wherein the memory is communicatively connected to the processor, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the steps of the method for maintaining a constant contrast of a display screen as described in the first aspect above.

[0028] In a third aspect, the present application further provides a non-volatile computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are executed by a display screen, the steps of the method for maintaining a constant display screen contrast as described in the first aspect above are implemented.

[0029] The beneficial effects of the embodiments of the present application are as follows: Different from the prior art, the display contrast constant method, display screen and storage medium provided by the embodiments of the present application obtain ambient light illumination, and when a change in ambient light illumination is detected, obtain the current light illumination, and determine the corresponding backlight brightness curve based on the correspondence between the current light illumination and the target white field brightness; wherein the backlight brightness curve is calculated based on multiple test light illuminations, the total reflection coefficient of the glass cover of the display screen, the display contrast and display parameters, and the display contrast is the ratio of the target white field brightness to the target black field brightness, so that the backlight setting value can be adjusted based on the backlight brightness curve to achieve a constant display contrast, and achieve consistent display contrast under different ambient light illuminations, which can improve the user's readability of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0031] Figure 1 This is a flow chart of an embodiment of a method for maintaining constant contrast of a display screen of the present application;

[0032] Figure 2 It is a structural schematic diagram of an embodiment of a device for maintaining constant contrast of a display screen of the present application;

[0033] Figure 3It is a schematic diagram of the hardware structure of a controller in one embodiment of the display screen of the present application. DETAILED DESCRIPTION

[0034] The present application is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that, if there is no conflict, the various features in the embodiments of the present application can be combined with each other, all within the scope of protection of the present application. In addition, although the functional module division is performed in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a sequence different from the module division in the device or the flow chart. In addition, the words "first", "second", "third", etc. used herein do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0038] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0039] The display screen contrast constant method and device provided in the embodiment of the present application can be applied to a display screen. The display screen of the present application can be a liquid crystal display, and the liquid crystal display screen can be installed in electronic devices with display screens such as televisions, smart phones, and iPads. Liquid crystal materials themselves do not emit light, so all liquid crystal displays require backlight tubes for illumination, and the brightness of the backlight determines the brightness of the display screen.

[0040] If the brightness of the display is too high, it will make the user feel dazzled. Therefore, it is necessary to adjust the display mode, brightness, and contrast of the display to control the maximum brightness of full white. The maximum brightness of most LCD screens can reach 200cd / m 2 Different ambient brightness and different display subjects require different brightness levels. For example, for tasks such as surfing the Internet and office work, since there are more white parts on the display screen, the brightness is between 80-120cd / m 2 It is more suitable; when processing pictures, in order to highlight the image details, the brightness is 150-180cd / m 2 More suitable.

[0041] The above brightness values ​​are empirical parameters. We also need to consider the ambient light illumination, that is, the ambient brightness. The human eye feels different about the same brightness display at night when the lights are turned off and in a bright office. Therefore, the display contrast also needs to be considered.

[0042] Display contrast refers to the ratio between the white brightness and the black brightness of the display. For example, when a monitor displays a full white screen (255), the measured brightness is 200cd / m 2 When the full black screen (0) is displayed, the measured brightness is 0.5cd / m 2 , then the contrast ratio of the display is 200 / 0.5=400:1.

[0043] At present, the adjustment of display contrast only takes into account the ambient light illumination, so that the display contrast is directly the ratio of the maximum brightness and the minimum brightness of the display tested in a dark room. However, the reflected brightness of the ambient light on the screen is usually ignored. When adjusting the backlight value, the reflected brightness of the ambient light on the screen is not considered. The obtained display contrast may not be able to adapt to the changing ambient light illumination, thereby affecting the user's readability of the display. There may be problems such as being too dark to see clearly, or seeing a piece of white flowers that requires some time to adapt.

[0044] See also Figure 1 , Figure 1 This is a flow chart of an embodiment of a method for maintaining a constant contrast ratio of a display screen applied to the present application. The method may be executed by a controller in a display screen. The method includes steps S101 to S104.

[0045] S101: Obtaining ambient light illumination.

[0046] Illuminance is the luminous flux per unit area, measured in lumens per cubic meter (lm / m 2), also called lux (lx), ambient light intensity refers to the light intensity in the current environment. For example, the outdoor ambient light intensity on a sunny day is usually 30,000 to 300,000 lux, the indoor ambient light intensity on a sunny day is usually 100 to 1,000 lux, the outdoor ambient light intensity on a cloudy day is usually 50 to 500 lux, the indoor ambient light intensity on a cloudy day is usually 5 to 50 lux, and so on.

[0047] The display screen is provided with an ambient light sensor, which can detect the ambient light illumination. The controller of the display screen is connected to the ambient light sensor, and the controller and the ambient light sensor exchange data through an internal protocol. Therefore, the controller of the display screen can obtain the ambient light illumination in real time through the ambient light sensor based on the internal protocol.

[0048] It is understandable that the internal protocol can be one of I2C, SPI, USB, and serial port protocols, as long as the controller of the display screen receives the ambient light illumination detected by the ambient light sensor, and is not limited here.

[0049] In some embodiments, before obtaining the ambient light illumination, the method further includes:

[0050] Turn on the eye protection mode. In this mode, the contrast of the display remains constant.

[0051] Specifically, the electronic device can control the display screen to have a variety of different display modes, such as eye protection mode, game mode, text mode, standard mode, etc. In different display modes, the contrast may be constant or may change at any time.

[0052] Eye protection mode is a display mode that reduces the blue light on the screen, thereby reducing damage to the eyes. Paper-like eye protection mode achieves eye protection function based on the constant contrast of paper. Therefore, after the user turns on the eye protection mode, the backlight setting value can be adjusted to achieve constant contrast.

[0053] It is understandable that the selection of the display mode is when the display screen is turned on, and the user can also select other display modes, which are not limited here. The display screen contrast constant method of the present application can be selected as the contrast constant in the eye protection mode.

[0054] S102: When a change in ambient light intensity is detected, the current light intensity is obtained.

[0055] When a change in ambient light intensity is detected, the current light intensity is obtained, for example, the current light intensity change is 50 lux.

[0056] Correspondingly, the current illuminance can be obtained through the ambient light sensor based on the internal protocol.

[0057] S103: Based on the correspondence between the current illuminance and the target white field brightness, determine the corresponding backlight brightness curve; wherein the backlight brightness curve is calculated based on multiple test illuminances, the total reflection coefficient of the glass cover of the display screen, the display screen contrast and display parameters, and the display screen contrast is the ratio between the target white field brightness and the target black field brightness.

[0058] In some of the embodiments, in order to determine the corresponding backlight brightness curve, the method may further include:

[0059] Calculate multiple test white field brightnesses based on current illuminance, total reflection coefficient of the glass cover of the display screen, first white field brightness LWmax, second white field brightness LWmin, first black field brightness LBmax, second black field brightness LBmin, and display screen contrast;

[0060] Based on the brightness of multiple test white fields, a control bar brightness curve relationship of the display screen is obtained.

[0061] Specifically, the surface of the display screen is usually provided with a glass cover plate, and the backlight tube emits light, which passes through the liquid crystal material and the glass cover plate to display the picture. Therefore, the impact of ambient light on the display screen is mainly manifested as the total reflection coefficient SCI (Specular Component Include) of the display screen. The total reflection coefficient SCI is used to measure the spectral reflection component and the reflector or diffuse reflection component of the sample. The measurement result of this measurement method includes all surface reflection light of the object (including specular reflection and diffuse reflection), which is independent of the structure and roughness of the surface of the object. The measurement result can reflect the true color of the object, and the gloss of the object will not affect the measurement result of the color data.

[0062] The first white field brightness is the white field brightness when the backlight setting value is adjusted to 100%, which is represented by LWmax. The second white field brightness is the white field brightness when the backlight setting value is adjusted to 0%, which is represented by LWmin. The first black field brightness is the black field brightness corresponding to the backlight setting value being adjusted to 100%, which is represented by LBmax. The second black field brightness is the white field brightness when the backlight setting value is adjusted to 0%, which is represented by LBmin.

[0063] Moreover, when adjusting the first white field brightness LWmax, the brightness control bar is adjusted to 100% to realize the white field brightness when the backlight setting value is adjusted to 100%, that is, the backlight setting value is the maximum; the second white field brightness LWmin is the white field brightness when the brightness control bar is adjusted to 0%, that is, the backlight setting value is the minimum; the first black field brightness LBmax is the black field brightness when the brightness control bar is adjusted to 100%, that is, the backlight setting value is the maximum; the second black field brightness LBmin is the black field brightness when the brightness control bar is adjusted to 0%, that is, the backlight setting value is the minimum.

[0064] The first white field brightness LWmax, the second white field brightness LWmin, the first black field brightness LBmax, and the second black field brightness LBmin can be obtained by prior detection and then stored, and can be called when needed; similarly, the total reflection coefficient SCI can also be detected in advance, such as SCI = 2.30%; the display contrast is expressed by ACR, and in the eye protection mode, the display contrast ACR = 35 is more suitable for human viewing and has an eye protection effect, so the display contrast ACR = 35 is the contrast value that is expected to be maintained.

[0065] When calculating the test white field brightness LW, it is calculated based on multiple test illuminances E, the total reflection coefficient SCI of the glass cover of the display, the first white field brightness LWmax, the second white field brightness LWmin, the first black field brightness LBmax, the second black field brightness LBmin and the display contrast ACR, specifically:

[0066] First, calculate the black field brightness difference value B, and use formula 1 to obtain it. Formula 1 is as follows:

[0067] B=LBmax-LBmin Formula 1;

[0068] Wherein, B represents the black field brightness difference, and the white field brightness difference W can also be calculated, which is obtained by using formula 2, which is as follows:

[0069] W = LWmax - LWmin Formula 2;

[0070] The backlight brightness curve is represented by L. The backlight brightness curve is related to the test white field brightness and the control bar brightness curve. In the backlight brightness curve, there is a linear relationship between the backlight setting value and the current test white field brightness, and the current test white field brightness changes with the change of the current illumination.

[0071] Furthermore, the backlight brightness curve L is expressed by Formula 3:

[0072] L = z^g Formula 3;

[0073] Among them, L represents the brightness corresponding to different positions of the brightness control bar, and its value is (0~1); z represents the position of the brightness control bar, and its value is (0~1); g represents the index in the relationship between position z and brightness L, and the value of g is determined according to the requirements of the brightness curve.

[0074] Then, since there is a linear relationship between the backlight setting value in the backlight brightness curve and the current test white field brightness, the relationship between the white field brightness LW and the change of the brightness control bar is calculated using formula 4, and formula 4 is as follows:

[0075] LW=(z^g)*(LWmax-LWmin)+LWmin Formula 4;

[0076] Substituting Formula 2 into Formula 4, we obtain Formula 5:

[0077] LW=(z^g)*W+LWmin Formula 5;

[0078] Similarly, the relationship between the black field brightness LB and the change of the brightness control bar is calculated using Formula 6, and Formula 6 is as follows:

[0079] LB=(z^g)*(LBmax-LBmin)+LBmin Formula 6;

[0080] Substituting formula 1 into formula 6, we get formula 7;

[0081] LB=(z^g)*B+LBmin Formula 7;

[0082] Then, using LW to represent LB, we can get Formula 8:

[0083] LB=[(LW-LWmin)*B / W]+LBmin formula 8.

[0084] The display contrast ACR is the ratio between the target white field brightness and the target black field brightness, which is expressed by formula 9:

[0085] ACR=LW1 / LB1 Formula 9;

[0086] Wherein, LW1 represents the target white field brightness, and LB1 represents the target black field brightness.

[0087] Based on the current ambient light illuminance E and the total reflection coefficient SCI, the relationship between the current white field brightness LW and the target white field brightness LW1 is expressed by formula 10:

[0088] LW1=LW+E*SCI / PI Formula 10;

[0089] Similarly, the relationship between the target black field brightness LB1 and the current black field brightness LB is expressed by formula 11:

[0090] LB1=LB+E*SCI / PI Formula 11;

[0091] Among them, PI = π, which can be taken as 3.14. Substituting formula 8 into formula 11, we can get formula 12:

[0092] LB1=LB+E*SCI / PI=[(LW-LWmin)*B / W]+LBmin+E*SCI / PI Formula 12;

[0093] Substituting formula 12 and formula 10 into formula 9, we get formula 13:

[0094] ACR=(LW+E*SCI / PI) / [[(LW-LWmin)*B / W]+LBmin+E*SCI / PI] Formula 13;

[0095] Thus, we obtain formula 14:

[0096] LW=[PI*ACR*W*LBmin+E*SCI*(ACR*WW)-PI*ACR*B*LWmin]

[0097] / PI*W-PI*ACR*B

[0098] Formula 15;

[0099] Substituting PI=3.14, we get formula 16:

[0100] LW=[3.14*ACR*W*LBmin+E*SCI*(ACR*WW)-3.14*ACR*B*LWmin]

[0101] / 3.14*W-3.14*ACR*B

[0102] Formula 16;

[0103] By using formula 16 and taking multiple values ​​of the test illuminance, a series of test white field brightness LW is calculated, and then the control strip brightness curve is calculated by the test white field brightness LW obtained by formula 16, which is expressed by formula 17:

[0104] L=z^g=(LW-LWmin) / W Formula 17;

[0105] Furthermore, when obtaining the current white field brightness LW, since it is necessary to keep the display contrast ACR constant, for example, ACR=35, which is a self-definable constant value, the total reflection coefficient SCI of the glass cover of the display is calculated to be 2.3%. Assuming that the first white field brightness LWmax=309.87133, the second white field brightness LWmin=16.210245, the first black field brightness LBmax=0.3404836, and the second black field brightness L Bmin=0.0235341, then, after determining that the display contrast ACR=35, the current illuminance E=50, the first white field brightness LWmax=309.87133, the second white field brightness LWmin=16.210245, the first black field brightness LBmax=0.3404836, and the second black field brightness LBmin=0.0235341, substitute into formula 16 and determine that the test white field brightness LW=15.74894267.

[0106] Then step S103 may include:

[0107] The corresponding first test white field brightness and the relationship between the control bar brightness curve corresponding to the first test white field brightness are determined according to the current illumination to determine the backlight brightness curve.

[0108] For example, the current ambient light illuminance is 70 lux. Substituting it into formula 10, the target white field brightness of LW' can be calculated. Since the display contrast ACR is fixed, it is equal to the target white field brightness divided by the target black field brightness. The target black field brightness LB' is calculated based on the target white field brightness LW', the current illuminance E, the total reflection coefficient SCI, the first white field brightness LWmax, the second white field brightness LWmin, the first black field brightness LBmax, the second black field brightness LBmin and the display contrast ACR. That is, according to formula 12, the target black field brightness LB' is calculated, and the first test black field brightness LB is calculated at the same time. Moreover, by substituting it into formula 16, the first test white field brightness LW can also be calculated, so that L=z^g in L=z^g=(LW-LWmin) / W is calculated, which is the control bar curve relationship. Usually, g=1.8803, then x^1.3=(z^g)^0.69137 is the backlight brightness curve.

[0109] S104: Based on the backlight brightness curve, adjust the backlight setting value to make the contrast of the display screen constant.

[0110] After the backlight brightness curve is calculated, the backlight setting value may be determined based on the backlight brightness curve, the maximum backlight setting value of the display screen, and the minimum backlight setting value;

[0111] The control display shows the setting value with backlight.

[0112] Specifically, the brightness setting value has a linear relationship with the first test white field brightness LW due to the backlight brightness curve, which is expressed by Formula 18:

[0113] (V-Vmin) / (Vmax-Vmin)=(LW-LWmin) / (LWmax-LWmin)=z^g Formula 18;

[0114] Among them, Vmax represents the maximum backlight setting value of the display screen, Vmin represents the minimum backlight setting value of the display screen, and V represents the backlight setting value.

[0115] Thus, the backlight setting value V can be calculated, which is expressed by formula 19:

[0116] V=z^g*(Vmax-Vmin)+Vmin formula 19.

[0117] The brightness setting value is 0-255, wherein Vmax=255, and Vmin can be based on the actual setting value in the system code, such as 11, and according to the setting of the above embodiment, V=9 is obtained.

[0118] After the backlight setting value V is obtained, the display is displayed with the backlight setting value V, and at the same time, the display contrast is kept constant at 35.

[0119] In an embodiment of the present application, the ambient light illumination is obtained, and when a change in the ambient light illumination is detected, the current illumination is obtained, and based on the corresponding relationship between the current illumination and the target white field brightness, the corresponding backlight brightness curve is determined; wherein the backlight brightness curve is calculated based on multiple test illuminations, the total reflection coefficient of the glass cover of the display screen, the display screen contrast, and display parameters, and the display screen contrast is the ratio between the target white field brightness and the target black field brightness, so that the backlight setting value can be adjusted based on the backlight brightness curve to achieve a constant display screen contrast and consistent display screen contrast under different ambient light illuminations, thereby improving the user's readability of the display screen.

[0120] The present application also provides a display screen contrast constant device, which is applied to a display screen. Figure 2 , which shows the structure of a display screen contrast constant device provided in an embodiment of the present application, the display screen contrast constant device 200 comprises:

[0121] The environment acquisition module 201 is used to obtain the ambient light illumination;

[0122] A change acquisition module 202 is used to acquire the current illuminance when a change in the ambient illuminance is detected;

[0123] The curve determination module 203 is used to determine the corresponding backlight brightness curve based on the corresponding relationship between the current light illuminance and the target white field brightness; wherein the backlight brightness curve is calculated based on multiple test light illuminances, the total reflection coefficient of the glass cover of the display screen, the display screen contrast and display parameters, and the display screen contrast is the ratio between the target white field brightness and the target black field brightness;

[0124] The adjustment module 204 is used to adjust the backlight setting value based on the backlight brightness curve to make the contrast of the display screen constant.

[0125] In an embodiment of the present application, the ambient light illumination is obtained, and when a change in the ambient light illumination is detected, the current light illumination is obtained, and based on the corresponding relationship between the current light illumination and the target white field brightness, the corresponding backlight brightness curve is determined; wherein the backlight brightness curve is calculated based on multiple test light illuminations, the total reflection coefficient of the glass cover of the display screen, the display screen contrast, and display parameters, and the display screen contrast is the ratio between the target white field brightness and the target black field brightness, so that the backlight setting value can be adjusted based on the backlight brightness curve to achieve a constant display screen contrast and consistent display screen contrast under different ambient light illuminations, thereby improving the user's readability of the display screen.

[0126] In some embodiments, the apparatus 200 further includes a curve acquisition module 205, which is used to:

[0127] Calculate multiple test white field brightnesses based on multiple test light illuminances, the total reflection coefficient of the glass cover of the display screen, the first white field brightness, the second white field brightness, the first black field brightness, the second black field brightness, and the contrast of the display screen;

[0128] Based on multiple test white field brightness, a control bar brightness curve relationship of the display screen is obtained;

[0129] Then the curve determination module 203 is also used for:

[0130] The corresponding first test white field brightness and the relationship between the control bar brightness curve corresponding to the first test white field brightness are determined according to the current light illumination to determine the backlight brightness curve.

[0131] In some embodiments, the adjustment module 204 is further configured to:

[0132] Determining the backlight setting value based on the backlight brightness curve, the maximum backlight setting value and the minimum backlight setting value of the display screen;

[0133] The display screen is controlled to display at the backlight setting value.

[0134] In some embodiments, the target black field brightness is calculated based on the target white field brightness, the current illuminance, the total reflection coefficient, the first white field brightness, the second white field brightness, the first black field brightness, the second black field brightness and the display screen contrast.

[0135] In some embodiments, the first white field brightness is the white field brightness when the backlight setting value is adjusted to 100%, the second white field brightness is the white field brightness when the backlight setting value is adjusted to 0%, the first black field brightness is the black field brightness corresponding to the backlight setting value being adjusted to 100%, the second black field brightness is the white field brightness when the backlight setting value is adjusted to 0%, the maximum value of the backlight setting is 255, and the minimum value of the backlight setting is 0.

[0136] In some embodiments, there is a linear relationship between the backlight setting value and the first test white field brightness, and is calculated based on the backlight setting value, the backlight setting maximum value, the backlight setting minimum value, the first white field brightness, and the second white field brightness.

[0137] In some embodiments, the apparatus 200 further includes an opening module 206 for:

[0138] Turn on the eye protection mode, wherein in the eye protection mode, the contrast of the display screen remains constant.

[0139] In some embodiments, the change acquisition module 202 is further configured to:

[0140] The current light level is obtained through the ambient light sensor based on the internal protocol.

[0141] It should be noted that the above device can execute the method provided in the embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in the device embodiment, please refer to the method provided in the embodiment of the present application.

[0142] Figure 3 FIG. 1 is a schematic diagram of the hardware structure of a controller of a display screen in an embodiment of the display screen, such as Figure 3 As shown, the controller includes:

[0143] One or more processors 111 and memory 112 . Figure 3 In the figure, a processor 111 and a memory 112 are taken as an example.

[0144] The processor 111 and the memory 112 may be connected via a bus or other means. Figure 3 The example of connecting through bus is taken in the following.

[0145] The memory 112 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as the program instructions / modules corresponding to the display contrast constant method in the embodiment of the present application (for example, the attached Figure 2The processor 111 executes various functional applications and data processing of the controller by running the non-volatile software programs, instructions and modules stored in the memory 112, that is, the display screen contrast constant method of the above method embodiment is implemented.

[0146] The memory 112 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required by at least one function; the data storage area may store data created according to the use of the personnel entry and exit detection device, etc. In addition, the memory 112 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 112 may optionally include a memory remotely arranged relative to the processor 111, and these remote memories may be connected to the display screen via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0147] The one or more modules are stored in the memory 112, and when executed by the one or more processors 111, the display screen contrast constant method in any of the above method embodiments is executed, for example, the above described method is executed. Figure 1 Steps S101 to S104 of the method; implementing Figure 2 The functions of modules 201-206 in FIG.

[0148] The above-mentioned product can execute the method provided in the embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the method provided in the embodiment of the present application.

[0149] The embodiment of the present application provides a non-volatile computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by one or more processors, such as Figure 3 A processor 111 in the embodiment may enable the one or more processors to execute the display screen contrast constant method in any of the above method embodiments, for example, executing the above described Figure 1 Steps S101 to S104 of the method; implementing Figure 2 The functions of modules 201-206 in FIG.

[0150] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0151] Through the description of the above embodiments, a person of ordinary skill in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, or of course by hardware. A person of ordinary skill in the art can understand that all or part of the processes in the above embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for maintaining constant contrast of a display screen, characterized in that: include: Get the ambient light intensity; When a change in the ambient light intensity is detected, obtaining the current light intensity; Based on the corresponding relationship between the current light illuminance and the target white field brightness, a corresponding backlight brightness curve is determined; wherein the backlight brightness curve is calculated based on a plurality of test light illuminances, a total reflection coefficient of a glass cover of a display screen, a display screen contrast, and display parameters, and the display screen contrast is a ratio between the target white field brightness and the target black field brightness; Based on the backlight brightness curve, a backlight setting value is adjusted to make the contrast of the display screen constant.

2. The method according to claim 1, characterized in that The method further comprises: Calculate multiple test white field brightnesses based on multiple test light illuminances, the total reflection coefficient of the glass cover of the display screen, the first white field brightness, the second white field brightness, the first black field brightness, the second black field brightness, and the contrast of the display screen; Based on multiple test white field brightness, a control bar brightness curve relationship of the display screen is obtained; The determining of a corresponding backlight brightness curve based on the corresponding relationship between the current light illumination and the target white field brightness includes: The corresponding first test white field brightness and the relationship between the control bar brightness curve corresponding to the first test white field brightness are determined according to the current light illumination to determine the backlight brightness curve.

3. The method according to claim 2, characterized in that The adjusting the backlight setting value based on the backlight brightness curve includes: Determining the backlight setting value based on the backlight brightness curve, the maximum backlight setting value and the minimum backlight setting value of the display screen; The display screen is controlled to display at the backlight setting value.

4. The method according to claim 2, characterized in that: The target black field brightness is calculated based on the target white field brightness, the current illuminance, the total reflection coefficient, the first white field brightness, the second white field brightness, the first black field brightness, the second black field brightness and the display screen contrast.

5. The method according to claim 3, characterized in that: The first white field brightness is the white field brightness when the backlight setting value is adjusted to 100%, the second white field brightness is the white field brightness when the backlight setting value is adjusted to 0%, the first black field brightness is the black field brightness corresponding to the backlight setting value being adjusted to 100%, the second black field brightness is the white field brightness when the backlight setting value is adjusted to 0%, the maximum value of the backlight setting is 255, and the minimum value of the backlight setting is 0.

6. The method according to claim 2, characterized in that There is a linear relationship between the backlight setting value and the first test white field brightness, and the backlight setting value is calculated based on the backlight setting value, the backlight setting maximum value, the backlight setting minimum value, the first white field brightness, and the second white field brightness.

7. The method according to any one of claims 1 to 6, characterized in that: Before obtaining the ambient light illumination, the method further includes: Turn on the eye protection mode, wherein in the eye protection mode, the contrast of the display screen remains constant.

8. The method according to claim 1, characterized in that The obtaining of the current illumination includes: The current light level is obtained through the ambient light sensor based on the internal protocol.

9. A display screen, characterized in that: The display screen comprises: An ambient light sensor, a display screen body, at least one processor, and a memory, wherein the memory is communicatively connected to the processor, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the steps of the method for maintaining a constant contrast of a display screen as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by the display screen, the steps of the method for maintaining a constant contrast of a display screen as claimed in any one of claims 1 to 8 are implemented.

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