CN114333711B - Color temperature detection method and device, color temperature adjusting method and display equipment - Google Patents
Color temperature detection method and device, color temperature adjusting method and display equipment Download PDFInfo
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Abstract
The embodiment of the application relates to a color temperature detection method and device, a color temperature adjusting method, display equipment, computer equipment and a computer readable storage medium, wherein the color temperature detection method comprises the following steps: acquiring a current dimming mode of a display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode; determining a corresponding target integration time period according to the current dimming mode; and acquiring ambient light color temperature according to the photosensitive data acquired by the color temperature sensor in the target integration period, wherein the color temperature sensor is arranged below the display screen, and the display screen is provided with a light transmitting area for light to enter the color temperature sensor. Based on the above, the sensing can be performed in a time period when the influence of the display screen on the photosensitive data is small, or some calculation means can be adopted to reduce the influence of the display screen on the photosensitive data, so that the sensing precision of the color temperature sensor can be improved, and the color temperature detection method with high detection precision is provided.
Description
Technical Field
The embodiment of the application relates to the technical field of display, in particular to a color temperature detection method and device, a color temperature adjustment method and display equipment.
Background
In recent years, with the development and industrial upgrading of display screen technologies, the requirements of consumers on display screens are higher and higher, and in order to improve the use experience of display equipment, narrow-frame display equipment with rich display adjusting functions is provided by all large manufacturers. The display adjusting function can adjust display parameters of the display screen according to the color temperature of the ambient light.
However, in order to realize a narrower frame, the color temperature sensor needs to be placed under the display screen, so that the detection accuracy of the color temperature is affected, and the corresponding adjusting function of the display device is affected.
Disclosure of Invention
The embodiment of the application provides a color temperature detection method and device, a color temperature adjustment method, display equipment, computer equipment and a computer-readable storage medium, and the detection precision of color temperature can be optimized.
A color temperature detection method, comprising:
acquiring a current dimming mode of a display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode;
determining a corresponding target integration time period according to the current dimming mode;
and acquiring ambient light color temperature according to the photosensitive data acquired by the color temperature sensor in the target integration period, wherein the color temperature sensor is arranged below the display screen, and the display screen is provided with a light transmitting area for light to enter the color temperature sensor.
A color temperature adjustment method, comprising:
acquiring the ambient light color temperature of the display screen by adopting the method;
and adjusting the display color temperature of the display screen according to the ambient light color temperature.
A color temperature detection apparatus comprising:
the mode acquisition module is used for acquiring the current dimming mode of the display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode;
the time interval determining module is used for determining a corresponding target integration time interval according to the current dimming mode;
and the color temperature calculation module is used for acquiring the ambient light color temperature according to the photosensitive data acquired by the color temperature sensor in the target integration period, the color temperature sensor is arranged below the display screen, and the display screen is provided with a light transmitting area for light to enter the color temperature sensor.
A display device, comprising:
the display screen is provided with a light-transmitting area for light to pass through, and the display screen adopts at least one dimming mode of a PWM (pulse-width modulation) dimming mode and a DC dimming mode to perform dimming;
the color temperature sensor is arranged below the display screen and used for collecting and sensing light rays incident from the light-transmitting area;
the processor is connected with the color temperature sensor and used for acquiring the current light modulation mode of the display screen; determining a corresponding target integration time period according to the current dimming mode; and controlling the color temperature sensor to collect and sense light in the target integration period, and acquiring the ambient light color temperature according to the photosensitive data collected by the color temperature sensor in the target integration period.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
According to the color temperature detection method and device, the color temperature adjusting method, the display device, the computer device and the computer readable storage medium, the corresponding target integration time interval is selected according to the dimming mode, so that the time interval with small influence on the photosensitive data on the display picture can be selected for sensing, or the influence on the photosensitive data on the display picture can be reduced by adopting some calculation means, and further the sensing precision of the color temperature sensor can be improved, so that the color temperature detection method with high detection precision is provided.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart illustrating a color temperature detection method according to an embodiment;
FIG. 2 is a schematic diagram illustrating an embodiment of a PWM dimming mode;
FIG. 3 is a second flowchart of a color temperature detection method according to an embodiment;
FIG. 4 is a third flowchart illustrating a color temperature detection method according to an embodiment;
FIG. 5 is a timing diagram illustrating a first target period according to one embodiment;
FIG. 6 is a fourth flowchart illustrating a color temperature detection method according to an embodiment;
FIG. 7 is a timing diagram illustrating a second target period and a third target period according to one embodiment;
FIG. 8 is a graph of display screen luminance versus black frame time according to an embodiment;
FIG. 9 is a fifth flowchart illustrating a color temperature detection method according to an embodiment;
FIG. 10 is a graph of the relationship between the backlight brightness level and K according to one embodiment;
FIG. 11 is a sixth flowchart of a color temperature detection method according to an embodiment;
FIG. 12 is a schematic diagram of a fourth target period and a fifth target period of an embodiment;
FIG. 13 is a block diagram of a color temperature detecting apparatus according to an embodiment;
FIG. 14 is a block diagram of a color temperature adjustment apparatus according to an embodiment;
FIG. 15 is an internal block diagram of a computer device according to an embodiment.
Detailed Description
To facilitate an understanding of the embodiments of the present application, the embodiments of the present application will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. The embodiments of the present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application belong. The terminology used herein in the description of the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In the description of the present application, "a number" means at least one, such as one, two, etc., unless specifically limited otherwise.
In the related art, liu Haiou which does not display a picture is arranged on the top of the display device, and a color temperature sensor can be placed below Liu Haiou so as to sense color temperature data of ambient light to adjust the color display effect of the display screen. However, due to the current narrow bezel requirements, liu Haiou in a display device needs to be eliminated to improve screen ratio. Therefore, it is necessary to place the color temperature sensor under the display screen, but it is understood that the color temperature sensor under the screen receives not only light from external ambient light but also leakage light from the display screen. Accordingly, the image displayed by the display screen can influence the photosensitive data collected by the color temperature sensor, so that the detection result of the color temperature is influenced.
In order to solve the above problem, in the present embodiment, a color temperature detection method is provided. The color temperature is a unit of measurement indicating that a light ray contains a color component, and reflects a cold and warm tone of the light ray. The ambient light color temperature acquired by the color temperature detection method can be used for adjusting the display color temperature of the display screen, adjusting the display brightness of the display screen, and adjusting the gamma coefficient of the display screen, which is not limited in this embodiment. Fig. 1 is a flowchart of a color temperature detection method according to an embodiment, and referring to fig. 1, the color temperature detection method according to the embodiment includes steps 102 to 106.
And 102, acquiring the current light modulation mode of the display screen. The dimming mode is one of a PWM dimming mode and a DC dimming mode.
The DC dimming mode is a mode for changing the brightness of the display screen by increasing or decreasing the power of the circuit. Alternatively, the circuit power may be adjusted by changing the voltage or current to change the display screen brightness. The PWM dimming mode refers to a manner of changing the brightness of the display screen according to the on and off alternation of the display screen. In other words, in the PWM dimming mode, the display screen is not continuously lighted when being lighted, but is continuously switched between lighting and extinguishing the display screen, so that human eyes recognize the brightness of the display screen as a required target brightness. Specifically, the longer the duration of the screen-off state, the lower the brightness the display screen gives to the human eye. The shorter the duration of the screen-off time, the higher the brightness the display screen gives to the human eyes. It can be understood that the DC dimming mode and the PWM dimming mode have different characteristics, respectively, due to different dimming principles. Therefore, two dimming modes can be configured for one display screen, and the corresponding dimming mode needs to be selected for dimming according to a display scene, so that the display quality is improved. It will be appreciated that in some embodiments, the display screen may be configured with only one of the dimming modes, and the dimming may be performed in all display scenarios.
Fig. 2 is a schematic display diagram of the PWM dimming mode according to an embodiment, wherein when the display screen in the PWM dimming mode is photographed at an extremely fast shutter speed, the schematic display diagram shown in fig. 2 can be obtained. That is, some of the light emitting devices in the display screen are in an on state, and the remaining light emitting devices are in an off state. The light-on and light-off of the light-emitting devices are controlled by the PWM signal, and the PWM signals received by each light-emitting device at the same time are not identical, so that a stripe shape shown in fig. 2 appears, and the position of the black stripe is shifted according to time. Specifically, the light emitting device in the black stripe region may be understood as a light emitting device that does not emit light, i.e., displays a black frame picture, when the PWM signal in the low level state is currently received. The light emitting devices in the remaining regions may be understood as the light emitting devices that currently receive the PWM signal in the high level state emit light, and the light emitting brightness corresponds to the picture to be displayed, that is, the picture is displayed as a data frame picture. Illustratively, if the refresh rate of the display screen is 60Hz and the frequency of the PWM signal is 360Hz, 6 black stripes are displayed as shown in fig. 2. If the refresh rate of the display screen is 60Hz and the frequency of the PWM signal is 480Hz, 8 black stripes are displayed. Therefore, the number of stripes shown in fig. 2 is only for illustrative purposes and is not intended to limit the scope of the present application.
It should be noted that the color temperature detection method in the embodiment of the present application may be applied to a display screen having only a PWM dimming mode, may also be applied to a display screen having only a DC dimming mode, and may also be applied to a display screen having two dimming modes, i.e., a PWM dimming mode and a DC dimming mode, which is not limited in the embodiment of the present application.
And 104, determining a corresponding target integration time period according to the current light modulation mode.
Specifically, for the PWM dimming mode, the light emitting devices of the light transmission region are partially in a light emitting state and partially in an off state. Correspondingly, if the light-emitting device in the light-transmitting area is in an off state, the color temperature sensor is controlled to collect data, and the data collected by the color temperature sensor cannot be influenced by the display screen. For the DC dimming mode, the photosensitive data acquired when the light-emitting device in the light-transmitting area is in the light-emitting state can be compared with the photosensitive data acquired when the light-emitting device in the light-transmitting area is in the reset state, so that the influence of light leakage of the display screen on the sensing result can be eliminated according to the comparison result. Therefore, different target integration periods are selected based on different dimming modes, an appropriate target integration period can be selected to collect the sensitization data, and accurate ambient light color temperature is obtained through analysis and processing of subsequent steps.
And 106, acquiring the ambient light color temperature according to the photosensitive data acquired by the color temperature sensor in the target integration period. The color temperature sensor is arranged below the display screen, and the display screen is provided with a light-transmitting area for light to enter the color temperature sensor.
The color temperature sensor can respectively acquire brightness data of different color channels, so that ambient light data can be acquired conveniently. For example, the color temperature sensor may acquire first luminance data of a red channel, second luminance data of a green channel, and third luminance data of a blue channel, respectively, and collectively use the first luminance data, the second luminance data, and the third luminance data as the collected sensed light data. In addition, due to the fact that the refresh rate of the current display screen is high, the light sensing data obtained by integrating the color temperature sensor in one black frame picture can not be sufficiently analyzed. Thus, the target integration period may include a plurality of periods, and data collected from the plurality of periods is accumulated as the overall exposure data. However, if the sensitivity of the color temperature sensor meets the requirement, only one time period may be set for integral sampling of the photosensitive data, and the embodiment is not limited.
In this embodiment, the corresponding target integration period is selected according to the dimming mode, so that a period with a small influence on the exposure data in the display screen can be selected for sensing, or some calculation means can be adopted to reduce the influence on the exposure data in the display screen, and further the sensing accuracy of the color temperature sensor can be improved, so as to provide a color temperature detection method with high detection accuracy.
Fig. 3 is a second flowchart of the color temperature detection method according to an embodiment, and referring to fig. 3, in one embodiment, the color temperature detection method includes steps 302 to 308. The implementation of step 302 is the same as that of step 102, and the implementation of step 308 is the same as that of step 106, which are not repeated herein. Step 104 in the embodiment of fig. 1 specifically includes steps 304 to 306 in this embodiment.
And step 304, if the current dimming mode is the PWM dimming mode, acquiring the duty ratio of the PWM signal.
And step 306, determining a corresponding target integration period according to the duty ratio and a duty ratio threshold value, wherein the duty ratio threshold value is positively correlated with the sensitivity of the color temperature sensor.
Wherein, the duty ratio of the PWM signal is related to the target brightness needing to be displayed. The PWM signal in the low level state is used for controlling a light emitting device in the display screen to display a black frame picture, and the PWM signal in the high level state is used for controlling the light emitting device to display a data frame picture. For example, if the target brightness to be displayed is 1nit and the brightness of the data frame picture is 4nit, the duty ratio of the PWM signal may be controlled to be 25%. That is, in one PWM signal period, 1/4 of the time is used to display 4nit of brightness and 3/4 of the time is used to display 0nit of brightness. Then, as long as the switching speed of the luminance is faster than the speed that the human eye can feel, the human eye can think that a picture with 1nit luminance is displayed. Similarly, if the target brightness to be displayed is 2nit and the brightness of the data frame picture is 4nit, the duty ratio of the PWM signal can be controlled to be 50%. That is, in one PWM signal period, 1/2 of the time is used to display 4nit of brightness and 1/2 of the time is used to display 0nit of brightness. Then, as long as the switching speed of the brightness is faster than the speed that the human eye can feel, the human eye will think that a picture with 2nit brightness is displayed. Therefore, for the PWM dimming mode, human eyes can feel different target brightness by adjusting the duty ratio of the PWM signal without changing the brightness of the data frame picture.
Based on the foregoing display principle, if the target brightness is low, the duration of the PWM display of the black frame image is required to be relatively long. If the target brightness is high, the time length for displaying the black frame picture by PWM is relatively short. It can be understood that if the duration of the black frame picture displayed by the PWM is too short, that is, the duty ratio of the PWM signal is too high, the color temperature sensor cannot acquire enough photosensitive data in one black frame picture, and cannot acquire an accurate ambient light color temperature. Therefore, it is necessary to further configure the selection manner of the target integration period according to the sensitivity of the color temperature sensor, thereby improving the accuracy of the color temperature detection result.
And 308, acquiring the color temperature of the ambient light according to the photosensitive data acquired by the color temperature sensor in the target integration period.
In this embodiment, a corresponding duty ratio threshold is set according to the sensitivity of the color temperature sensor, and a larger duty ratio threshold may be set for the color temperature sensor with higher sensitivity to adapt to a sensing scene with a shorter duration of the black frame picture. A smaller duty cycle threshold may also be set for less sensitive color temperature sensors to adapt to a longer period of the sensing scene of the black frame picture. Based on the steps of the embodiment, a more flexible and accurate color temperature detection method can be realized.
Fig. 4 is a third flowchart of a color temperature detection method according to an embodiment, referring to fig. 4, in which the color temperature detection method includes steps 402 to 408. The implementation of step 402 is the same as that of step 302, and the implementation of step 404 is the same as that of step 304, which are not repeated herein. Step 306 of the embodiment in fig. 3 specifically includes step 406 of the present embodiment, and step 308 specifically includes step 408 of the present embodiment.
And 402, acquiring the current light modulation mode of the display screen.
In step 404, if the current dimming mode is the PWM dimming mode, the duty ratio of the PWM signal is obtained.
At step 406, when the duty cycle is less than the duty cycle threshold, a first target period is determined as the target integration period. The first target period is located in a black frame period, which is a period in which the light emitting devices of the light transmissive region are used to display a black frame picture.
And step 408, acquiring the ambient light color temperature according to the first photosensitive data acquired by the color temperature sensor in the first target time period.
FIG. 5 is a timing diagram illustrating a first target period according to an embodiment, and referring to FIG. 5, a frequency of the panel synchronization signal is the same as a refresh rate of the display panel. The duty ratio of the PWM signal corresponds to the width of the black frame period, and is used for realizing the adjustment of different brightness in the PWM dimming mode. The ALS integrated sampling signal is a signal for controlling the color temperature sensor to perform integrated sampling, and the part filled with oblique lines is the first target time period (i.e., the time period corresponding to ALS 1). In this embodiment, when the duty ratio is smaller than the duty ratio threshold, that is, the black frame width is larger than the width threshold, enough ambient light can be collected in the black frame period of the display screen, and the low-light black frame phase algorithm can be implemented. Referring to fig. 5, it can be found that als1 can acquire ambient light information without display screen interference, and therefore, when the als1 information includes color information, that is, when als1 is (R1, G1, B1) or (X1, Y1, Z1), or in other forms of channel combination, first photosensitive data of pure ambient light color temperature can be obtained, and then the ambient light color temperature is calculated. Further, in one refresh cycle of the display screen, for example, 6 first target periods may be set as shown in fig. 5 to acquire more accurate first sensed light data. It is understood that in other embodiments, only 2, 4, etc. data in the first target time period may be acquired.
Fig. 6 is a fourth flowchart of a color temperature detection method according to an embodiment, referring to fig. 6, in which the color temperature detection method includes steps 602 to 608. The implementation of step 602 is the same as that of step 302, and the implementation of step 604 is the same as that of step 304, which are not repeated herein. Step 306 of the embodiment in fig. 3 specifically includes step 606 of the embodiment, and step 308 specifically includes step 608 of the embodiment.
And step 604, if the current dimming mode is the PWM dimming mode, acquiring the duty ratio of the PWM signal.
And 606, when the duty ratio is larger than or equal to the duty ratio threshold value, respectively determining a second target time period and a third target time period as target integration time periods.
And 608, acquiring the ambient light color temperature according to the second photosensitive data acquired by the color temperature sensor in the second target time interval, the third photosensitive data acquired in the third target time interval, the duration of the second target time interval and the duration of the third target time interval.
Fig. 7 is a timing diagram of a second target period and a third target period according to an embodiment, and referring to fig. 7, the duty ratio of the PWM signal is greater than that of fig. 5, and the black frame period of the PWM signal is shortened. Specifically, fig. 8 is a graph of the luminance of the display screen versus the black frame time according to an embodiment, and referring to fig. 8, when the target luminance is small (i.e. the luminance is the area marked as 1 in the figure), the low-light black frame period algorithm provided by the embodiment of fig. 4 can be adopted, but as the target luminance is continuously increased (i.e. the luminance is the area marked as 2 in the figure), the black frame period time is gradually shortened. Therefore, when the duty cycle is not small enough or the device sensitivity is not sufficient to support a shorter integration time, the algorithm in the embodiment of fig. 4 is no longer applicable, i.e. the algorithm of the embodiment can be used to obtain the ambient light color temperature.
With continued reference to fig. 7, in the present embodiment, the black frame period of the PWM signal is located in the second target period (i.e., the period corresponding to als 2) by adjusting the duration of the second target period and the duration of the third target period (i.e., the period corresponding to als 3), i.e., the second target period completely covers the PWM period black frame period. At the same time, the third target period is located in the data frame period, i.e., the third target period is entirely within the data frame period. The black frame period is a period in which the light emitting device of the light transmitting area is used to display a black frame picture, and the data frame period is a period in which the light emitting device of the light transmitting area is used to display a data frame picture.
Based on the above arrangement, the collected sensitization satisfies the following formula:
als2＝A*T1+P*(T1-TO)---①
als3＝A*T2+P*T2---②
where a is Ambient light, P is Panel light, T1 is the integration time of the color temperature sensor in the second target period (i.e., the duration of the second target period), T2 is the integration time of the color temperature sensor in the third target period (i.e., the duration of the third target period), and T0 is the black frame width. It is emphasized that a plurality of third target time periods should be located in the same refresh cycle of the display screen to avoid that the picture changes displayed by the display screen affect the result of the collected data of als 3. In the present embodiment, based on the above formula, the ambient light can be obtained by calculation
Thereby realizing accurate detection of the ambient light. In addition, in the calculation process, corresponding data can be acquired respectively for each color channel, so that the result of each color channel of the ambient light is respectively acquired according to the formula, and the color temperature of the ambient light is comprehensively judged.
In one embodiment, a display screen is configured with a plurality of backlight brightness levels in a PWM dimming mode. Specifically, when the display screen displays, the corresponding backlight brightness level can be selected according to the brightness range of the image to be displayed, so that the display quality is improved or the power consumption is reduced. However, as the backlight brightness level changes, T0, T1 and T2 also need to change accordingly to adapt to different display scenes. Wherein the duty ratio of the PWM signal is inversely related to the backlight brightness level and positively related to the target display brightness of the light emitting device. Fig. 9 is a fifth flowchart of a color temperature detection method according to an embodiment, and referring to fig. 9, in the embodiment, the color temperature detection method further includes steps 910 and 912. Step 910 and step 912 are at least performed before step 908, preferably before step 902, and may be performed in advance before the display device leaves the factory, for example.
And 912, obtaining preset backlight coefficients corresponding to the backlight brightness levels according to the calibration data, wherein the preset backlight coefficients are used for obtaining the ambient light color temperature together with the photosensitive data.
And step 902, acquiring a current light modulation mode of the display screen.
And 904, if the current dimming mode is the PWM dimming mode, obtaining the duty ratio of the PWM signal.
And 908, acquiring the color temperature of the ambient light according to the second photosensitive data acquired by the color temperature sensor in the second target time interval, the third photosensitive data acquired in the third target time interval, the duration of the second target time interval and the duration of the third target time interval.
In one embodiment, the duration of the second target period and the duration of the third target period are both the target duration T, so as to simplify the control logic of the color temperature sensor and the complexity of data processing. When the above setting is adopted, setting T1= T2= T, then als3-als2= P × T0, and accordingly, the ambient light a and the display screen light P satisfy the following equation:
therefore, since T0, T1, and T2 are related to the backlight brightness level, only the coefficient K needs to be obtained to obtain the accurate ambient light a. In this embodiment, the photosensitive data when the ambient light brightness is zero is obtained in step 910, that is, it can be understood that a =0 in the above equation is set, and thus:
als3 (A＝0) ＝P*T
further, curves as shown in fig. 10 may be generated for different relationships between backlight luminance levels and the coefficient K, respectively, and fitted to obtain a curve function K = f (B), where B refers to a backlight luminance Level.
In one embodiment, the ambient light color temperature is obtained according to the second exposure data collected by the color temperature sensor in the second target period, the third exposure data collected in the third target period, the duration of the second target period and the duration of the third target period, and the method comprises the following steps. Acquiring the current backlight brightness level of a display screen and a preset backlight coefficient corresponding to the current backlight brightness level; and acquiring the color temperature of the ambient light according to the current preset backlight coefficient, the second photosensitive data, the third photosensitive data, the duration of the second target time period and the duration of the third target time period.
Specifically, in this embodiment, according to the correspondence between the backlight brightness level and the coefficient K obtained in the previous embodiment, the coefficient K corresponding to the current backlight brightness level may be substituted into the formula (4) as a prior formula, so as to obtain the actual ambient light a, that is, the ambient light with the display screen light interference subtracted therefrom is obtained. Therefore, when the information a contains color information, that is, when a is in a channel combination form of (R1, G1, B1) or (X1, Y1, Z1) or other forms, pure ambient light color information can be obtained, and then the ambient light color temperature is calculated through a, that is, the mid-light gradient region color temperature algorithm is implemented.
Fig. 11 is a sixth flowchart of a color temperature detection method according to an embodiment, and referring to fig. 11, in an embodiment, the color temperature detection method includes steps 1102 to 1106. The implementation manner of step 1102 is the same as that of step 102, step 104 in the embodiment of fig. 1 specifically includes step 1104 in this embodiment, and step 106 specifically includes step 1106 in this embodiment.
And 1102, acquiring a current light modulation mode of the display screen.
In step 1104, if the current dimming mode is the DC dimming mode, a fourth target period and a fifth target period are respectively determined as the target integration periods.
And step 1106, acquiring the color temperature of the ambient light according to the fourth photosensitive data acquired by the color temperature sensor in the fourth target time interval and the fifth photosensitive data acquired in the fifth target time interval.
Specifically, fig. 12 is a schematic diagram of a fourth target period and a fifth target period of an embodiment, and referring to fig. 12, the reset period of the dc signal is located in the fourth target period (i.e., the period corresponding to als 4), and the fifth target period (i.e., the period corresponding to als 5) is located in the data frame period, the reset period is a period in which the data signal of the light emitting device of the light transmissive region is reset, and the data frame period is a period in which the light emitting device of the light transmissive region is used to display a data frame picture. The color temperature detection method of the present embodiment is used to detect the ambient light color temperature in the display screen scene of the area 3 in fig. 8. Here, when the dimming mode is the DC dimming mode, the ideal state of the DC signal is as shown by the dotted line in the figure, i.e., completely reset to the low level. However, there is a state where the image does not fall down and different images do not appear uniformly, as shown by a solid line in the figure. Therefore, the algorithm using only the similar region 2 is not enough to realize the off-screen color temperature detection with high accuracy. Therefore, in this embodiment, the difference between the brightness when actually displaying the data frame picture and the brightness when resetting can be obtained through the fourth photosensitive data als4 and the fifth photosensitive data als5, and the light leakage of the display screen is deducted by introducing the above-mentioned difference als5-als4 and three RGB variables only related to the display screen, so as to obtain the accurate color temperature of the ambient light.
In one embodiment, before obtaining the color temperature of the ambient light according to the fourth photosensitive data collected in the fourth target period and the fifth photosensitive data collected in the fifth target period by the color temperature sensor, the method further comprises the following steps. And respectively acquiring multiple groups of fourth photosensitive data and fifth photosensitive data of the display screen when the ambient light brightness is zero, and taking the multiple groups of fourth photosensitive data and the fifth photosensitive data as training sample sets. And training according to the training sample set to construct a preset calculation model, wherein the preset calculation model is a multi-order function related to the data frame picture, the fourth photosensitive data and the fifth photosensitive data. Similar to the embodiment of fig. 9, in this embodiment, because the difference between the data frame pictures in the DC dimming mode is large, training needs to be performed first according to multiple sets of data when the ambient light brightness is zero, so as to determine a preset calculation model with relatively good matching property for any type of data frame picture, that is, obtain multiple coefficients in the multi-order function. Specifically, the multi-order function may be as follows:
P＝f(R，G，B，(als5-als4))＝K 1 R 3 +K 2 R 2 +K 3 R+K 4 G 3 +K 5 G 2 +K 6 G+K 7 B 3 +K 8 B 2 +K 9 B+K(als5-als4)
in the above formula, the K parameter needs to depend on a priori experience, and RGB refers to data of three channels (R, G, B) of an image. Wherein, the data of the three channels can be obtained by pixel weighted average calculation of the area above the color temperature sensor. When K is calculated, als5-als4 under different backlight brightness levels and different pictures (for example, one thousand pictures) need to be captured, and a least square method is used for solving according to the captured data and the formula, so that a relatively accurate coefficient is obtained. Based on the trained preset calculation model, the currently acquired fourth photosensitive data, the currently acquired fifth photosensitive data and the currently displayed picture, the ambient light data A = als4-P can be obtained through calculation. When the information A contains color information, namely the information A is in a channel combination form of (R1, G1, B1) or (X1, Y1, Z1) or other forms, the color information of the ambient light with the interference of the display screen basically eliminated can be obtained, and then the color temperature of the ambient light is calculated through the information A, namely, the highlight frame color temperature compensation algorithm is realized.
It should be noted that, the three algorithms (the low light black frame phase algorithm, the medium light gradual change region color temperature algorithm, and the highlight frame buffer color temperature compensation algorithm) may all be used independently or individually, and may be specifically selected in combination with the specific type and state of the display screen. Specific types and states include, for example, the duty cycle of the PWM signal, whether DC is removed, whether full-range PWM is enabled, etc. The timing sequences in fig. 5, fig. 7 and fig. 12 are all realized by the delay of the screen synchronization signal VSYNC or the tearing signal TE of the display screen, and can be designed according to different refresh rates.
The embodiment of the application also provides a color temperature adjusting method, which comprises the steps of obtaining the ambient light color temperature of the display screen by adopting the method; and adjusting the display color temperature of the display screen according to the ambient light color temperature. Based on the color temperature detection method of the embodiment, the accurate ambient light color temperature can be obtained, so that the accurate adjustment of the display color temperature is realized.
It should be understood that, although the steps in the flowcharts are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a portion of the steps in each flowchart may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The embodiment of the application also provides display equipment which comprises a display screen, a color temperature sensor and a processor. The display screen is provided with a light-transmitting area for light to pass through, and the display screen adopts at least one dimming mode of a PWM dimming mode and a DC dimming mode to perform dimming. The color temperature sensor is arranged below the display screen and used for collecting and sensing light rays incident from the light-transmitting area. The processor is connected with the color temperature sensor and used for acquiring the current light modulation mode of the display screen; determining a corresponding target integration time period according to the current light modulation mode; and controlling the color temperature sensor to collect and sense light in a target integration period, and acquiring the color temperature of the ambient light according to the photosensitive data collected by the color temperature sensor in the target integration period. In this embodiment, the processor selects the corresponding target integration period according to the dimming mode, so that a period with a small influence on the exposure data in the display screen can be selected for sensing, or some calculation means can be adopted to reduce the influence on the exposure data by the display screen, and further the sensing accuracy of the color temperature sensor can be improved, so as to provide the display device with high color temperature detection accuracy.
In one embodiment, the display screen is an adaptive frequency modulation (ADFR) screen, and the display screen is a Low Temperature Polycrystalline Oxide (LTPO) screen, the processor is configured to determine a first target period as the target integration period, the first target period is located in a black frame period, and the black frame period is a period in which the light emitting device of the light-transmitting region is configured to display a black frame picture. The self-adaptive frequency modulation screen has enough black frame width, uses a low-light black frame stage algorithm and obtains accurate ambient light color temperature.
In one embodiment, the display screen is a polarizer-free (Polless) OLED screen, the processor is configured to determine a second target period and a third target period as target integration periods, respectively, the black frame period is located in the second target period, and the third target period is located in a data frame period, where the data frame period is a period in which the light emitting devices in the light-transmitting region are used for displaying a data frame image. The transmittance of an OLED screen without a polarizer layer (Polless) is low, so that the color temperature sensor can pass through a color temperature algorithm in a middle light gradual change region based on longer integration time, and the sensing precision of the color temperature sensor is improved. In some embodiments, the detection may also be performed by using a combination of a low-light black frame stage algorithm and a medium-light gradual change region color temperature algorithm, so as to increase the detection speed of color temperature and the complexity of data processing.
In one embodiment, the display screen is a DC dimming screen, the processor is configured to determine a fourth target period and a fifth target period as the target integration periods, respectively, the reset period of the DC signal is located in the fourth target period, and the fifth target period is located in the data frame period, the reset period is a period in which the data signal of the light emitting device of the light transmissive region is reset, and the data frame period is a period in which the light emitting device of the light transmissive region is used to display the data frame picture. That is, the DC dimming screen of the present embodiment obtains the ambient light color temperature completely by the highlight frame buffer color temperature compensation algorithm.
In one embodiment, the display screen is a dual-dimming mode screen having a PWM dimming mode and a DC dimming mode, and the processor is configured to select to determine the first target period as the target integration period, or to select to determine the second target period and the third target period as the target integration period, or to select to determine the fourth target period and the fifth target period as the target integration period. That is, the dual light modulation mode screen of this embodiment may adopt a combination of the low light black frame stage algorithm, the middle light gradual change region color temperature algorithm, and the highlight frame buffer color temperature compensation algorithm to perform detection, and automatically select a suitable algorithm according to the current light modulation mode and the like to obtain the ambient light color temperature.
Based on the same inventive concept, the embodiment of the present application further provides a color temperature detection apparatus for implementing the color temperature detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so the specific limitations in one or more embodiments of the color temperature detection device provided below can be referred to the limitations on the color temperature detection method in the above, and details are not repeated here.
Fig. 13 is a block diagram of a color temperature detection apparatus according to an embodiment, and referring to fig. 13, the color temperature detection apparatus in this embodiment includes a mode obtaining module 1302, a period determining module 1304, and a color temperature calculating module 1306. The mode obtaining module 1302 is configured to obtain a current dimming mode of the display screen, where the dimming mode is one of a PWM dimming mode and a DC dimming mode. The period determination module 1304 is configured to determine a corresponding target integration period according to the current dimming mode. The color temperature calculation module 1306 is configured to obtain an ambient light color temperature according to the photosensitive data collected by the color temperature sensor in the target integration period.
Fig. 14 is a block diagram of a color temperature adjustment apparatus according to an embodiment, and referring to fig. 14, in this embodiment, the color temperature adjustment apparatus includes a mode obtaining module 1402, a time period determining module 1404, a color temperature calculating module 1406, and a color temperature adjusting module 1408. The mode obtaining module 1402 is configured to obtain a current dimming mode of the display screen, where the dimming mode is one of a PWM dimming mode and a DC dimming mode. The period determination module 1404 is used for determining a corresponding target integration period according to the current dimming mode. The color temperature calculating module 1406 is used for obtaining the color temperature of the ambient light according to the photosensitive data collected by the color temperature sensor in the target integration period. The color temperature adjusting module 1408 is configured to adjust a display color temperature of the display screen according to the color temperature of the ambient light.
The color temperature detecting device and the color temperature adjusting device can be realized by software, hardware and their combination. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, and the computer device may be a terminal, and the internal structure diagram thereof may be as shown in fig. 15. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a color temperature detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 15 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory in which a computer program is stored and a processor which, when executing the computer program, implements the method in the preceding embodiments.
In one of the embodiments, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, carries out the method of the preceding embodiment.
In one of the embodiments, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the method of the preceding embodiment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), magnetic Random Access Memory (MRAM), ferroelectric Random Access Memory (FRAM), phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express a few embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the concept of the embodiments of the present application, and these embodiments are within the scope of the present application. Therefore, the protection scope of the patent of the embodiment of the application shall be subject to the appended claims.
Claims (14)
1. A color temperature detection method, comprising:
acquiring a current dimming mode of a display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode;
if the current dimming mode is a PWM dimming mode, acquiring the duty ratio of a PWM signal, wherein the PWM signal in a low level state is used for controlling a light-emitting device in a display screen to display a black frame picture, and the PWM signal in a high level state is used for controlling the light-emitting device to display a data frame picture; when the duty ratio is greater than or equal to a duty ratio threshold value, respectively determining a second target time period and a third target time period as target integration time periods, wherein a black frame time period is located in the second target time period, the third target time period is located in a data frame time period, the black frame time period is a time period in which a light-emitting device of a light-transmitting region is used for displaying the black frame picture, the data frame time period is a time period in which the light-emitting device of the light-transmitting region is used for displaying the data frame picture, and the duty ratio threshold value is positively correlated with the sensitivity of the color temperature sensor;
and acquiring the ambient light color temperature according to the second photosensitive data acquired by the color temperature sensor in the second target time period, the third photosensitive data acquired by the third target time period, the duration of the second target time period and the duration of the third target time period, wherein the color temperature sensor is arranged under the display screen, and the display screen is provided with a light-transmitting area for light to enter the color temperature sensor.
2. The color temperature detection method according to claim 1, characterized by further comprising:
when the duty ratio is smaller than the duty ratio threshold value, determining a first target time period as the target integration time period, wherein the first target time period is located in a black frame time period, and the black frame time period is a time period for displaying the black frame picture by the light-emitting devices of the light-transmitting area;
the acquiring of the ambient light color temperature according to the photosensitive data acquired by the color temperature sensor in the target integration period comprises:
and acquiring the color temperature of the ambient light according to the photosensitive data acquired by the color temperature sensor in the first target time period.
3. The color temperature detection method according to claim 1, wherein the display screen is configured with a plurality of backlight brightness levels in a PWM dimming mode, and a duty ratio of the PWM signal is inversely related to the backlight brightness levels and positively related to a target display brightness of the light emitting device; before the obtaining the color temperature of the ambient light according to the second photosensitive data acquired by the color temperature sensor in the second target period, the third photosensitive data acquired by the third target period, the duration of the second target period and the duration of the third target period, the method further includes:
respectively acquiring the third photosensitive data of the display screen under each backlight brightness grade when the ambient light brightness is zero, and respectively taking the third photosensitive data as calibration data of each backlight brightness grade;
and respectively obtaining a preset backlight coefficient corresponding to each backlight brightness grade according to each calibration data, wherein the preset backlight coefficient is used for obtaining the ambient light color temperature together with the photosensitive data.
4. The color temperature detection method according to claim 3, wherein the duration of the second target period and the duration of the third target period are both target durations.
5. The color temperature detection method of claim 4, wherein the obtaining the ambient light color temperature according to the second exposure data collected by the color temperature sensor in the second target period, the third exposure data collected in the third target period, the duration of the second target period, and the duration of the third target period comprises:
acquiring the current backlight brightness level of the display screen and the preset backlight coefficient corresponding to the current backlight brightness level;
obtaining the ambient light color temperature according to the following formula:
6. A color temperature detection method, comprising:
acquiring a current dimming mode of a display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode;
if the current dimming mode is a DC dimming mode, respectively determining a fourth target period and a fifth target period as target integration periods, where a reset period of a DC signal is located in the fourth target period, and the fifth target period is located in a data frame period, where the reset period is a period in which a data signal of a light emitting device of a light transmissive region is reset, and the data frame period is a period in which the light emitting device of the light transmissive region is used to display a data frame picture;
and acquiring the ambient light color temperature according to fourth photosensitive data acquired by the color temperature sensor in a fourth target time period and fifth photosensitive data acquired by the color temperature sensor in a fifth target time period, wherein the color temperature sensor is arranged under the display screen, and the display screen is provided with a light transmitting area for light to enter the color temperature sensor.
7. The color temperature detection method according to claim 6, wherein before obtaining the color temperature of the ambient light according to fourth exposure data collected by a color temperature sensor in a fourth target period and fifth exposure data collected in a fifth target period, the method further comprises:
respectively acquiring multiple groups of fourth photosensitive data and fifth photosensitive data of the display screen when the ambient light brightness is zero, and taking the multiple groups of fourth photosensitive data and the fifth photosensitive data as training sample sets;
and training according to the training sample set to construct a preset calculation model, wherein the preset calculation model is a multi-order function related to the data frame picture, the fourth photosensitive data and the fifth photosensitive data.
8. A color temperature adjustment method, comprising:
acquiring the ambient light color temperature of the display screen by adopting the method of any one of claims 1 to 7;
and adjusting the display color temperature of the display screen according to the ambient light color temperature.
9. A color temperature detection apparatus, characterized by comprising:
the mode acquisition module is used for acquiring the current dimming mode of the display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode;
a time interval determining module, configured to obtain a duty ratio of a PWM signal if the current dimming mode is the PWM dimming mode, where the PWM signal in a low level state is used to control a light emitting device in a display screen to display a black frame picture, and the PWM signal in a high level state is used to control the light emitting device to display a data frame picture; when the duty ratio is greater than or equal to a duty ratio threshold value, respectively determining a second target time period and a third target time period as target integration time periods, wherein a black frame time period is located in the second target time period, the third target time period is located in a data frame time period, the black frame time period is a time period in which a light-emitting device of a light-transmitting region is used for displaying the black frame picture, the data frame time period is a time period in which the light-emitting device of the light-transmitting region is used for displaying the data frame picture, and the duty ratio threshold value is positively correlated with the sensitivity of the color temperature sensor;
and the color temperature calculation module is used for acquiring the ambient light color temperature according to the second photosensitive data acquired by the color temperature sensor in the second target time period, the third photosensitive data acquired in the third target time period, the duration of the second target time period and the duration of the third target time period.
10. A color temperature detection apparatus, characterized by comprising:
the mode acquisition module is used for acquiring the current dimming mode of the display screen, wherein the dimming mode is one of a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode;
a time period determining module, configured to determine a fourth target time period and a fifth target time period as target integration time periods respectively if the current dimming mode is the DC dimming mode, where a reset time period of the DC signal is located in the fourth target time period, and the fifth target time period is located in a data frame time period, the reset time period is a time period for resetting a data signal of a light emitting device in the light transmissive region, and the data frame time period is a time period for the light emitting device in the light transmissive region to display the data frame picture;
and the color temperature calculation module is used for acquiring the color temperature of the ambient light according to fourth photosensitive data acquired by the color temperature sensor in a fourth target time period and fifth photosensitive data acquired in a fifth target time period.
11. A display device, comprising:
the display screen is provided with a light-transmitting area for light to pass through, and the display screen adopts at least one dimming mode of a PWM (pulse-width modulation) dimming mode and a DC dimming mode to perform dimming;
the color temperature sensor is arranged below the display screen and used for collecting and sensing light rays incident from the light-transmitting area;
a processor connected to the color temperature sensor for performing the method of any one of claims 1 to 8.
12. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 8.
13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.
14. A computer program product comprising a computer program which, when executed by a processor, carries out the method of any one of claims 1 to 8.
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