Method for adjusting the brightness of a backlight and display device

Abstract

The application provides a photosensitive regulation method for backlight brightness and a display device, which are applied to a photosensitive regulation circuit, the photosensitive regulation circuit comprising a photoelectric sensing circuit, an amplification circuit, a smoothing circuit, an analog-digital conversion sampling circuit, a control circuit and a backlight source, and the method comprises the following steps: if the change of ambient light meets a preset condition, the photoelectric sensing circuit outputs an analog signal; the amplification circuit receives and amplifies the analog signal to output an amplified analog signal; the smoothing circuit receives the amplified analog signal and smoothes the change direction of the amplified analog signal; the analog-digital conversion sampling circuit samples in a preset sampling mode within the time of the change direction of the smoothed amplified analog signal, converts the amplified analog signal into a digital signal; and the control circuit receives the digital signal, adjusts the brightness of the backlight source in a preset regulation mode based on the digital signal. When the ambient light changes, the human eye is more easily adapted to the change of the brightness of the backlight, and the experience of the change of the display brightness of the liquid crystal display device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of display, and particularly relates to a light-sensing adjustment method for backlight brightness and a display device. BACKGROUND

[0002] The existing liquid crystal display device comprises a liquid crystal panel and a backlight module. Since the liquid crystal itself cannot emit light, the backlight module inside the liquid crystal display device needs to provide a backlight source for the liquid crystal display device. The backlight module uniformly emits light emitted by the backlight source into the liquid crystal panel to display an image. The display brightness is a main performance parameter of the display device.

[0003] Currently, the light-sensing adjustment of the backlight brightness of the liquid crystal display device directly switches the backlight brightness according to the brightness of the ambient light. When the ambient light changes, the experience of the human eye adapting to the display brightness of the liquid crystal display device is very poor.

[0004] The prior art has the problem that the experience of people for the change of the display brightness of the liquid crystal display device is very poor when the ambient light changes. SUMMARY

[0005] The application embodiment provides a light-sensing adjustment method and device for backlight brightness, which can solve the problem that the experience of people for the change of the display brightness of the liquid crystal display device is very poor when the ambient light changes.

[0006] In a first aspect, the application embodiment provides a light-sensing adjustment method for backlight brightness, which is applied to a light-sensing adjustment circuit. The light-sensing adjustment circuit comprises a photoelectric sensing circuit, an amplification circuit, a smoothing circuit, an analog-to-digital conversion sampling circuit, a control circuit and a backlight source. The photoelectric sensing circuit is connected to the amplification circuit. The amplification circuit is connected to the smoothing circuit. The smoothing circuit is connected to the analog-to-digital conversion sampling circuit. The analog-to-digital conversion sampling circuit is connected to the control circuit. The control circuit is connected to the backlight source. The light-sensing adjustment method comprises the following steps.

[0007] If the change of the ambient light meets a preset condition, the photoelectric sensing circuit outputs an analog signal;

[0008] The amplification circuit receives and amplifies the analog signal to output an amplified analog signal;

[0009] The smoothing circuit receives the amplified analog signal and smooths the change direction of the amplified analog signal;

[0010] The analog-to-digital conversion sampling circuit samples in a preset sampling mode within the change direction time of the smoothed amplified analog signal, and converts the amplified analog signal into a digital signal;

[0011] The control circuit receives the digital signal and adjusts the brightness of the backlight source in a preset adjustment mode based on the digital signal.

[0012] In one of the embodiments, the analog signal includes a first analog signal, a second analog signal, a third analog signal and a fourth analog signal, and the preset condition includes a first preset condition, a second preset condition, a third preset condition and a fourth preset condition.

[0013] If the change of the ambient light meets the preset condition, the photoelectric sensing circuit outputs a first analog signal, including:

[0014] If the change of the ambient light meets the first preset condition, the first analog signal is outputted.

[0015] If the change of the ambient light meets the second preset condition, the second analog signal is outputted.

[0016] If the change of the ambient light meets the third preset condition, the third analog signal is outputted.

[0017] If the change of the ambient light meets the fourth preset condition, the fourth analog signal is outputted.

[0018] In one of the embodiments, the brightness level of the ambient light includes a plurality of preset brightness levels.

[0019] The first preset condition is that the preset brightness level before the change of the ambient light and the preset brightness level after the change of the ambient light are both greater than or equal to a preset brightness level threshold.

[0020] The second preset condition is that the preset brightness level before the change of the ambient light and the preset brightness level after the change of the ambient light are both less than a preset brightness level threshold.

[0021] In one of the embodiments, the third preset condition is that the change of the brightness level of the ambient light is greater than or equal to 2 preset brightness levels.

[0022] The fourth preset condition is that the change of the brightness level of the ambient light is less than 2 preset brightness levels.

[0023] In one of the embodiments, the amplification circuit includes an operational amplifier, the non-inverting input terminal of the operational amplifier is connected to the photoelectric sensing circuit, and the amplified output terminal of the operational amplifier is connected to the gentle circuit.

[0024] The step of receiving and amplifying the analog signal to output an amplified analog signal by the amplification circuit, including:

[0025] The non-inverting input terminal of the operational amplifier is connected to the analog signal and amplifies the analog signal.

[0026] The output end of the operational amplifier outputs the amplified analog signal to the smoothing circuit

[0027] In one embodiment, the smoothing circuit comprises a first resistor and a first capacitor, a first end of the first resistor is connected to the amplification circuit, a second end of the first resistor is connected to a first end of the first capacitor and the analog-digital conversion sampling circuit, and a second end of the first capacitor is connected to a power supply ground.

[0028] The step of receiving the amplified analog signal and smoothing a change edge of the amplified analog signal by the smoothing circuit comprises:

[0029] The first end of the first resistor receives the amplified analog signal.

[0030] The first capacitor smoothes the change edge of the amplified analog signal based on capacitor charging or capacitor discharging.

[0031] In one embodiment, the preset adjustment mode comprises a first preset adjustment mode.

[0032] The step of adjusting the brightness of the backlight source based on the digital signal in a preset adjustment mode comprises:

[0033] Adjusting the brightness of the backlight source based on the digital signal in the first preset adjustment mode, wherein the first preset adjustment mode is to obtain a gradient sampling signal according to a preset sampling number of the change edge of the smoothed amplified analog signal based on the digital signal, and to adjust based on the gradient sampling signal.

[0034] In one embodiment, the preset adjustment mode further comprises a second preset adjustment mode and a third preset adjustment mode.

[0035] The step of adjusting the brightness of the backlight source based on the digital signal in a preset adjustment mode comprises:

[0036] Adjusting the brightness of the backlight source based on the digital signal in the second preset adjustment mode, wherein the second preset adjustment mode is to adjust according to a preset duty cycle corresponding to the digital signal; or

[0037] Adjusting the brightness of the backlight source based on the digital signal in the third preset adjustment mode, wherein the third preset adjustment mode is to adjust according to a corresponding backlight brightness value converted from the digital signal.

[0038] In one embodiment, a preset step value and a preset time length are set between each adjustment in the preset adjustment mode.

[0039] In a second aspect, the embodiments of the present application provide a display device, comprising a display panel and a driving module, the display panel being electrically connected with the driving module, and the driving module comprising a light-sensing adjustment circuit configured to perform the light-sensing adjustment method according to any one of the first aspect.

[0040] It can be understood that the beneficial effects of the second aspect described above can be referred to the related description in the first aspect described above, which will not be repeated here.

[0041] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0042] The present application is applied to a light-sensing adjustment circuit, which comprises a photoelectric sensing circuit, an amplification circuit, a smoothing circuit, an analog-to-digital conversion sampling circuit, a control circuit and a backlight source. The photoelectric sensing circuit is connected with the amplification circuit, the amplification circuit is connected with the smoothing circuit, the smoothing circuit is connected with the analog-to-digital conversion sampling circuit, the analog-to-digital conversion sampling circuit is connected with the control circuit, and the control circuit is connected with the backlight source. The light-sensing adjustment method comprises the following steps: when the change of the ambient light meets a preset condition, the photoelectric sensing circuit outputs an analog signal; the amplification circuit receives and amplifies the analog signal to output an amplified analog signal; the smoothing circuit receives the amplified analog signal and smooths the change edge of the amplified analog signal; the analog-to-digital conversion sampling circuit samples in a preset sampling mode within the time of the smoothed change edge of the amplified analog signal, and converts the amplified analog signal into a digital signal; and the control circuit receives the digital signal and adjusts the brightness of the backlight source in a preset adjustment mode based on the digital signal. Compared with the prior art, the adjustment mode of the backlight brightness is not directly switched according to the brightness of the ambient light, but the preset adjustment mode is adopted to adjust the backlight brightness based on various situations of the change of the brightness of the ambient light, so that the human eye is more easily adapted to the change of the backlight brightness caused by the change of the ambient light, and the experience of the change of the display brightness of the liquid crystal display device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0044] Figure 1 is a structural schematic diagram of a light-sensing adjustment circuit provided by an embodiment of the present application;

[0045] Figure 2 is a flowchart of a light-sensing adjustment method of backlight brightness provided by an embodiment of the present application;

[0046] Figure 3is a flowchart of a process provided by another embodiment of the present application, in which the light-sensing circuit 10 outputs an analog signal if the change of the ambient light meets a preset condition;

[0047] Figure 4 is a flowchart of a process provided by another embodiment of the present application, in which the amplifying circuit receives and amplifies the analog signal to output an amplified analog signal;

[0048] Figure 5 is a flowchart of a process provided by another embodiment of the present application, in which the smoothing circuit receives the amplified analog signal and smoothes the change direction of the amplified analog signal;

[0049] Figure 6 is a flowchart of a process provided by an embodiment of the present application, in which the control circuit adjusts the brightness of the backlight;

[0050] Figure 7 is a flowchart of a process provided by another embodiment of the present application, in which the control circuit adjusts the brightness of the backlight;

[0051] Figure 8 is a schematic diagram of a circuit principle of the light-sensing adjusting circuit provided by an embodiment of the present application;

[0052] Figure 9 is a schematic diagram of a structure of the display device provided by an embodiment of the present application.

[0053] Explanation of reference numerals:

[0054] 10, light-sensing circuit; 20, amplifying circuit; 30, smoothing circuit; 40, analog-digital conversion sampling circuit; 50, control circuit; 60, backlight;

[0055] R1, first resistor; R2, second resistor; R3, third resistor; C1, first capacitor; U1, operational amplifier. DETAILED DESCRIPTION

[0056] In the following description, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, persons skilled in the art will understand that the present application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and methods have not been described in detail in order to avoid obscuring the description of the present application.

[0057] It should be understood that the term "comprising" as used in the specification and in the claims indicates the presence of the recited features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0058] It should also be understood that the term "and / or" as used herein refers to a combination of any one or more of the associated listed items, and all possible combinations, and includes these combinations.

[0059] In addition, in the description of the present application and the appended claims, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0060] In the present application, the reference "one embodiment" or "some embodiments" and the like means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in further some embodiments" and the like appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0061] The current backlight brightness of the liquid crystal display device is mainly adjusted according to the brightness of the ambient light to directly switch the backlight brightness, which makes the human eye adapt to the display brightness of the liquid crystal display device very poor when the ambient light changes. For example, when the light in a room is suddenly turned on or turned off, due to the large change in the brightness of the ambient light, if the backlight brightness is directly switched according to the brightness of the ambient light, it will cause a dramatic change in the backlight brightness of the liquid crystal display device, and the human eye cannot adapt to such a dramatic change, which gives a very poor experience. If the brightness of the liquid crystal display device is too high in the case of relatively dark ambient light, it will also harm the eyes and waste electricity, reducing the experience of people to the liquid crystal display device.

[0062] The prior art has the problem that people's experience of the change in the display brightness of the liquid crystal display device is very poor when the ambient light changes.

[0063] The backlight brightness adjustment method of the present application is applied to a photosensitive adjustment circuit, such as Figure 1 As shown, the photosensitive adjustment circuit includes a photoelectric sensing circuit 10, an amplification circuit 20, a smoothing circuit 30, an analog-to-digital conversion sampling circuit 40, a control circuit 50 and a backlight source 60. The photoelectric sensing circuit 10 is connected to the amplification circuit 20, the amplification circuit 20 is connected to the smoothing circuit 30, the smoothing circuit 30 is connected to the analog-to-digital conversion sampling circuit 40, the analog-to-digital conversion sampling circuit 40 is connected to the control circuit 50, and the control circuit 50 is connected to the backlight source 60.

[0064] The backlight brightness adjustment method of this application involves the following steps: if the change in ambient light meets preset conditions, the photoelectric sensing circuit outputs an analog signal; the amplification circuit receives and amplifies the analog signal and outputs an amplified analog signal; the smoothing circuit receives the amplified analog signal and smooths the change edge of the amplified analog signal; the analog-to-digital conversion sampling circuit samples the amplified analog signal within the time of the change edge of the smoothed amplified analog signal using a preset sampling method and converts the amplified analog signal into a digital signal; the control circuit receives the digital signal and adjusts the backlight brightness according to the digital signal using a preset adjustment method. Compared with the prior art, this method does not directly switch the backlight brightness adjustment method based on the ambient light brightness, but rather adjusts the backlight brightness using a preset adjustment method based on various changes in ambient light brightness. This makes it easier for the human eye to adapt to changes in backlight brightness caused by changes in ambient light, thus improving the user's experience of changes in display brightness of the liquid crystal display device.

[0065] The technical solution of this application will be described below through specific embodiments.

[0066] Firstly, such as Figure 2 As shown in the figure, this application embodiment provides a backlight brightness photosensitive adjustment method, applied to a photosensitive adjustment circuit, the photosensitive adjustment method including:

[0067] S100, if the change in ambient light meets the preset conditions, the photoelectric sensing circuit 10 outputs an analog signal.

[0068] In one embodiment, the preset conditions include a first preset condition, a second preset condition, a third preset condition, and a fourth preset condition, and the analog signals include a first analog signal, a second analog signal, a third analog signal, and a fourth analog signal. This facilitates the output of corresponding analog signals according to different ambient light variations, enabling targeted adjustment of backlight brightness. It should be noted that the analog signals are not limited to current analog signals; they can also be voltage analog signals, depending on the specific requirements of the actual photosensor adjustment circuit.

[0069] In some embodiments, the photoelectric sensing circuit 10 includes a thin film transistor (TFT). The drain of the TFT generates a current change according to the different light intensities of the ambient light and outputs a corresponding analog current signal. Alternatively, the photoelectric sensing circuit 10 may also convert the analog current signal into an analog voltage signal and output a analog voltage signal. Or, the drain and source of the TFT generate voltage changes according to the different light intensities of the ambient light and output a corresponding analog voltage signal.

[0070] In one embodiment, the brightness level of the ambient light comprises a plurality of preset brightness levels. In one embodiment, according to the current analog signal outputted by the thin film transistor TFT, the number of preset brightness levels is set to 8, when the current analog signal I is less than or equal to 1uA, it is the first preset brightness level; when 1.3uA≤I≤2uA, it is the second preset brightness level; when 2.3uA≤I≤3uA, it is the third preset brightness level; when 3.3uA≤I≤4uA, it is the fourth preset brightness level; when 4.3uA≤I≤5uA, it is the fifth preset brightness level; when 5.3uA≤I≤6uA, it is the sixth preset brightness level; when 6.3uA≤I≤8uA, it is the seventh preset brightness level; when 8.3uA≤I, it is the eighth preset brightness level. In another embodiment, the current analog signal outputted by the thin film transistor TFT is converted into a corresponding voltage analog signal, when the voltage analog signal V is less than or equal to 1.78V, it is the first preset brightness level; when 1.82V≤V≤1.92V, it is the second preset brightness level; when 1.96V≤V≤2.05V, it is the third preset brightness level; when 2.09V≤V≤2.19V, it is the fourth preset brightness level; when 2.23V≤V≤2.32V, it is the fifth preset brightness level; when 2.36V≤V≤2.45V, it is the sixth preset brightness level; when 2.49V≤V≤2.72V, it is the seventh preset brightness level; when 2.76V≤V, it is the eighth preset brightness level.

[0071] In one embodiment, as shown in FIG. 1, if the change of the ambient light meets the preset condition, the step of outputting the analog signal by the photosensitive sensing circuit 10 comprises: Figure 3

[0072] S110, outputting a first analog signal if the change of the ambient light meets a first preset condition.

[0073] In one embodiment, the first preset condition is that the preset brightness level before the change of the ambient light and the preset brightness level after the change of the ambient light are both greater than or equal to a preset brightness level threshold. Since the human eye is not sensitive to the change of the ambient light in the case of high brightness, it is beneficial to output the first analog signal when the change of the ambient light meets the first preset condition, to quickly adjust the brightness of the backlight, so as to adapt the human eye to the change of the ambient light as soon as possible.

[0074] In one embodiment, the preset brightness level threshold is the third preset brightness level, and the first preset condition is that the preset brightness level before the change of the ambient light and the preset brightness level after the change of the ambient light are both greater than or equal to the third preset brightness level.

[0075] S120, outputting a second analog signal if the change of the ambient light meets a second preset condition.

[0076] ​In one embodiment, the second preset condition is that the preset brightness level before the change of the ambient light and the preset brightness level after the change of the ambient light are both less than a preset brightness level threshold. Since the human eye is more sensitive to the change of the ambient light in the case of relatively low brightness, it is beneficial to output the second analog signal when the change of the ambient light satisfies the second preset condition, and to correspondingly adjust the brightness of the backlight, so as to gradually adapt the human eye to the change of the ambient light.

[0077] In one embodiment, the preset brightness level threshold is a third preset brightness level, and the first preset condition is that the preset brightness level before the change of the ambient light and the preset brightness level after the change of the ambient light are both less than the third preset brightness level.

[0078] S130, outputting a third analog signal if the change of the ambient light satisfies a third preset condition.

[0079] In one embodiment, the third preset condition is that the change of the brightness level of the ambient light is greater than or equal to 2 preset brightness levels. Since the human eye is more sensitive to the change of the ambient light in the case of relatively large change of the brightness of the ambient light, it is beneficial to output the third analog signal when the change of the ambient light satisfies the third preset condition, and to correspondingly adjust the brightness of the backlight, so as to gradually adapt the human eye to the change of the ambient light. For example, the brightness level of the ambient light changes from the fifth preset brightness level to the third preset brightness level, or the brightness level of the ambient light changes from the second preset brightness level to the fourth preset brightness level.

[0080] S140, outputting a fourth analog signal if the change of the ambient light satisfies a fourth preset condition.

[0081] In one embodiment, the fourth preset condition is that the change of the brightness level of the ambient light is less than 2 preset brightness levels. Since the human eye is not sensitive to the change of the ambient light in the case of relatively small change of the brightness of the ambient light, it is beneficial to output the fourth analog signal when the change of the ambient light satisfies the fourth preset condition, and to adaptively adjust the brightness of the backlight, so as to quickly adapt the human eye to the change of the ambient light.

[0082] It should be noted that if the change of the ambient light simultaneously satisfies any two of the first preset condition, the second preset condition, the third preset condition or the fourth preset condition, the output analog signal is the same or equal.

[0083] S200, the amplification circuit 20 receives and amplifies the analog signal to output an amplified analog signal.

[0084] In one embodiment, the amplification circuit 20 includes an operational amplifier U1, and the non-inverting input terminal "+" of the operational amplifier U1 is connected to the photoelectric sensing circuit 10, and the amplified output terminal of the operational amplifier U1 is connected to the gentle circuit.

[0085] In one embodiment, as shown in FIG. 2, the output terminal of the photoelectric sensing circuit 10 is connected to the non-inverting input terminal "+" of the operational amplifier U1, and the output terminal of the operational amplifier U1 is connected to the input terminal of the gentle circuit. Figure 4As shown, the step of receiving and amplifying the analog signal to output an amplified analog signal by the amplification circuit 20 comprises:

[0086] S210, the non-inverting input terminal of the operational amplifier U1 receives and amplifies the analog signal.

[0087] S220, the output terminal of the operational amplifier U1 outputs the amplified analog signal to the smoothing circuit 30.

[0088] In one embodiment, the operational amplifier U1 amplifies the voltage analog signal output by the photoelectric sensing circuit 10, forms a square wave with amplified amplitude, and outputs to the smoothing circuit 30.

[0089] In one embodiment, the amplification circuit 20 further comprises a second resistor R2 and a third resistor R3, the non-inverting input terminal of the operational amplifier U1 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the second resistor R2 is grounded, the second end of the third resistor R3 is connected to the output terminal of the operational amplifier U1 and the input terminal of the smoothing circuit 30, the negative power supply terminal of the operational amplifier U1 is connected to the power supply voltage, and the positive power supply terminal of the operational amplifier U1 is grounded, wherein the third resistor R3 is a radio frequency resistor.

[0090] S300, the smoothing circuit 30 receives the amplified analog signal and smoothes the change edge of the amplified analog signal.

[0091] In one embodiment, the smoothing circuit 30 comprises a first resistor R1 and a first capacitor C1, the first end of the first resistor R1 is connected to the amplification circuit, the second end of the first resistor R1 is connected to the first end of the first capacitor C1 and the analog-to-digital conversion sampling circuit, and the second end of the first capacitor C1 is grounded.

[0092] In one embodiment, as shown, Figure 5 the step of receiving the amplified analog signal and smoothing the change edge of the amplified analog signal by the smoothing circuit 30 comprises:

[0093] S310, the first end of the first resistor R1 receives the amplified analog signal.

[0094] S320, the first capacitor C1 smoothes the change edge of the amplified analog signal based on capacitor charging or capacitor discharging.

[0095] In one embodiment, when the brightness level of the ambient light changes from low to high, the amplified analog signal output by the amplification circuit jumps from low voltage to high voltage, and since the voltage across the first capacitor C1 cannot change abruptly, it can only change exponentially according to the capacitor charging law, and the change along the time is about t = R1*C1; when the brightness level of the ambient light changes from high to low, the amplified analog signal output by the amplification circuit jumps from high voltage to low voltage, and the voltage across the first capacitor C1 still changes exponentially according to the capacitor discharging law, and the change along the time is about t = R1*C1. In one embodiment, the change along the time is about 180us to 220us, and preferably, the change along the time is 200us.

[0096] S400, the analog-to-digital conversion sampling circuit 40 samples the amplified analog signal in the change along the time after the flattening according to a preset sampling mode, and converts the amplified analog signal into a digital signal.

[0097] In one embodiment, the analog-to-digital conversion sampling circuit 40 samples the amplified analog signal in the change along the time after the flattening according to a preset sampling mode, and converts the amplified analog signal into a digital signal, which is beneficial for soft adjustment of the change of the backlight brightness, and further improves the experience of people.

[0098] In one embodiment, the preset sampling mode includes a first preset sampling mode and a second preset sampling mode, the first preset sampling mode is to sample according to a preset time interval in the change along the time, and the second preset sampling mode is to sample according to a preset analog signal value of the amplified analog signal in the change along the time, which is beneficial for adjusting the backlight brightness more suitable for the human eye according to different changes of the ambient light.

[0099] In one embodiment, if the change along the time after the flattening of the amplified analog signal is t, and the time t has a certain time range, the analog-to-digital conversion sampling circuit samples the analog signal in the change along the time, and linearly converts it into a backlight brightness value. In this way, the change of the backlight brightness will become relatively soft and not so abrupt.

[0100] In one embodiment, the smoothed amplified analog signal is an analog current signal, the change along time t is 200us, the preset time interval is 20us, the first preset sampling mode is sampling every 20us within the change along time, the analog current signal is sampled 10 times in turn within the change along time t, 10 current signal values are obtained in turn, and the 10 current signal values are converted into backlight brightness values in turn. In another embodiment, if the ambient light changes from the fourth preset brightness level to the second preset brightness level, the current analog signal changes from 4uA to 2uA, the preset analog signal value is set every 0.1uA, and the second preset sampling mode is sampling every 0.1uA within the change along time according to the change of the amplified analog signal from 4uA to 2uA along the change along time.

[0101] S500, the control circuit 50 receives the digital signal, and adjusts the brightness of the backlight source in a preset adjustment mode based on the digital signal.

[0102] In one embodiment, the control circuit 50 receives the digital signal, and adjusts the brightness of the backlight source in a preset adjustment mode based on the digital signal, which can adjust the brightness of the backlight source according to various changes of the ambient light, which is beneficial to the adaptation of the human eye to the change of the ambient light, and further improves the experience of people to the display device.

[0103] In one embodiment, the preset adjustment mode includes a first preset adjustment mode.

[0104] In one embodiment, the step of adjusting the brightness of the backlight source in a preset adjustment mode based on the digital signal comprises:

[0105] adjusting the brightness of the backlight source in a first preset adjustment mode based on the digital signal, wherein the first preset adjustment mode is to obtain a gradient sampling signal by preset sampling times according to the change along the smoothed amplified analog signal of the digital signal, and adjusting based on the gradient sampling signal. After the gradient sampling signal is obtained by preset sampling times based on the preset sampling mode, the backlight brightness is adjusted according to the gradient sampling signal, which is beneficial to reducing the fatigue of the human eye through the smooth and soft change of the backlight brightness, and improving the experience of people to the display device.

[0106] In one embodiment, as Figure 6As shown, the analog-digital conversion sampling circuit samples to obtain a plurality of gradient sampling signals, the control circuit sequentially receives and reads each gradient sampling signal, the control circuit sequentially converts each gradient sampling signal into a corresponding backlight brightness value, the control circuit adds a corresponding preset delay after each backlight brightness value, the control circuit controls the change of the backlight brightness according to each backlight brightness value and the corresponding preset delay, it is judged whether the control circuit has read a plurality of gradient sampling signals, if a plurality of gradient sampling signals have been read, the analog-digital conversion sampling circuit continues to sample to obtain a plurality of gradient sampling signals, if a plurality of gradient sampling signals cannot be read, the control circuit continues to sequentially receive and read each gradient sampling signal. For example, the analog-digital conversion sampling circuit samples 10 times in the first preset sampling mode within the change direction time t, and obtains a total of 10 gradient sampling signals including the 1st gradient sampling signal to the 10th gradient sampling signal, the control circuit sequentially receives and reads the gradient sampling signal, and converts it into a corresponding backlight brightness value, and sequentially converts the 10 gradient sampling signals into the 1st backlight brightness value to the 10th backlight brightness value; Since the 1st gradient sampling signal and the 2nd gradient sampling signal are the first two gradient sampling signals that have just changed from the previous ambient light to the next ambient light, in order to avoid stimulating the human eye and reduce the fatigue of the personnel, a first preset delay is added after the 1st backlight brightness value corresponding to the 1st gradient sampling signal, and a second preset delay is added after the 2nd backlight brightness value corresponding to the 2nd gradient sampling signal, that is, the brightness values of the 1st backlight brightness value and the 2nd backlight brightness value are allowed to last for a preset delay time; The 3rd gradient sampling signal to the 10th gradient sampling signal are sequentially read, and a third preset delay to a tenth preset delay is added after each gradient backlight brightness value corresponding to the gradient sampling signal; If the serial number of the gradient sampling signal read by the control circuit is less than or equal to 10, the control circuit repeatedly reads the gradient sampling signal after the last gradient sampling signal until the 10th gradient sampling signal, so as to reduce the fatigue of the human eye by using a smooth and soft backlight brightness change, and improve the experience of people on the display device. It should be noted that in this embodiment, the delay time of the first preset delay to the tenth preset delay can be equal or not equal, and the specific preset delay is set according to the change of the ambient light.

[0107] In one embodiment, the preset adjustment mode further includes a second preset adjustment mode and a third preset adjustment mode.

[0108] In one embodiment, the step of adjusting the brightness of the backlight source based on the digital signal in the preset adjustment mode includes:

[0109] Adjusting the brightness of the backlight source based on the digital signal in the second preset adjustment mode, the second preset adjustment mode being adjusted according to the preset duty cycle corresponding to the digital signal;

[0110] Or adjust the brightness of the backlight source in a third preset adjustment mode based on the digital signal, the third preset adjustment mode being adjusting according to the conversion of the digital signal into a corresponding backlight brightness value.

[0111] In one embodiment, a preset brightness level of the ambient light is associated with a duty cycle of pulse width modulation (PWM), and the preset brightness level is associated with a digital signal, so that the backlight brightness can be adjusted according to the preset duty cycle corresponding to the digital signal, and the change of the ambient light can be used to adjust the backlight brightness by changing the duty cycle.

[0112] In one embodiment, the duty cycle corresponding to the first preset brightness level is 30%, the duty cycle corresponding to the second preset brightness level is 40%, the duty cycle corresponding to the third preset brightness level is 50%, the duty cycle corresponding to the fourth preset brightness level is 60%, the duty cycle corresponding to the fifth preset brightness level is 70%, the duty cycle corresponding to the sixth preset brightness level is 80%, the duty cycle corresponding to the seventh preset brightness level is 90%, and the duty cycle corresponding to the eighth preset brightness level is 100%. For example, when the ambient light changes, the preset brightness level associated with the digital signal changes from the third preset brightness level to the sixth preset brightness level, and the control circuit adjusts the brightness of the backlight source in the second preset adjustment mode, that is, adjusts the output duty cycle from 50% to 80% to adjust the backlight brightness, so that the backlight brightness changes synchronously with the ambient light, and the experience of the display device is improved.

[0113] In another embodiment, a preset brightness level of the ambient light is associated with a digital signal, and each digital signal is associated with a corresponding backlight brightness value, so that the backlight brightness can be adjusted according to the backlight brightness value corresponding to the digital signal, the change of the ambient light can be used to adjust the backlight brightness by switching to the backlight brightness value corresponding to the digital signal, the calculation amount can be reduced, and the switching of the backlight brightness can be accelerated.

[0114] In yet another embodiment, preset step value and preset time length are set between each adjustment in preset adjustment mode. When ambient light changes, in order to further improve the comfort of the human eye to the change of backlight brightness and reduce the fatigue of the human eye, preset step value and / or preset time length can also be set between each adjustment in various preset adjustment modes to adjust the backlight brightness according to the change of ambient light. For example, when ambient light changes from the third preset brightness level to the sixth preset brightness level, the duty cycle of the output is adjusted from 50% to 80% to adjust the backlight brightness. Since the change of ambient light is greater than 2 preset brightness levels and greater than or equal to the third preset brightness level of the preset brightness level threshold, the preset step value is set to 5%, and the duty cycle is adjusted from 50% to 80% by 5% step value. For another example, when ambient light changes from the second preset brightness level to the first preset brightness level, the duty cycle of the output is adjusted from 40% to 30% to adjust the backlight brightness. Since the change of ambient light is less than 2 preset brightness levels and less than the third preset brightness level of the preset brightness level threshold, the preset step value is set to 1%, and the duty cycle is adjusted from 40% to 30% by 1% step value. For another example, in order to further reduce the sensitivity of the human eye in low brightness and improve the comfort of the human eye, preset time length can also be added between each 1% step value. If the change time of the change front is 200us and the preset time length is set to 20us, after adjusting 1% in the change time of the change front, 20us is waited, and then the next 1% adjustment is performed.

[0115] In yet another embodiment, after the control circuit adjusts the brightness of the backlight source based on the digital signal in the preset adjustment mode, if the second backlight brightness value after adjustment is not equal to the preset first backlight brightness value which is the preset backlight brightness value matched with ambient light, the control circuit needs to adjust the second backlight brightness value to the first backlight brightness value. Preset step value and preset time length can also be set between each adjustment to further reduce the sensitivity of the human eye in low brightness and improve the comfort of the human eye. For example, if the second backlight brightness value M is greater than the first backlight brightness value N, the brightness difference value between the second backlight brightness value M and the first backlight brightness value N is obtained. If the brightness difference value is greater than the brightness difference value threshold, the step value is greater than or equal to the step value threshold, and the preset time length is less than the preset time length threshold, the second backlight brightness value is adjusted to the first backlight brightness value based on the step value and the preset time length. For another example, if the second backlight brightness value M is less than the first backlight brightness value N, the brightness difference value between the second backlight brightness value M and the first backlight brightness value N is obtained. If the brightness difference value is less than the brightness difference value threshold, the step value is greater than or equal to the step value threshold, and the preset time length is less than the preset time length threshold. The second backlight brightness value is adjusted to the first backlight brightness value based on the step value and the preset time length.

[0116] In yet another embodiment, as Figure 7As shown, the analog-to-digital conversion sampling circuit samples and converts to obtain a digital sampling signal, the control circuit receives and reads the digital sampling signal, the control circuit converts the digital sampling signal into a corresponding backlight brightness value, judges the size of the corresponding backlight brightness value B and the preset backlight brightness value A, if the second backlight brightness value B is less than the first backlight brightness value A, the control circuit sets the preset step value and the preset delay according to the difference between A and B, the control circuit reduces the backlight brightness according to the backlight brightness value and the corresponding preset step value n, the control circuit adds the corresponding preset delay after each changed backlight brightness value, the control circuit controls the change of the backlight brightness according to the backlight brightness value and the corresponding preset delay, judges whether the corresponding backlight brightness value B is greater than or equal to the preset backlight brightness value A, if the corresponding backlight brightness value B is greater than or equal to the preset backlight brightness value A, the control circuit continues to reduce the backlight brightness according to the backlight brightness value and the corresponding preset step value n, until the corresponding backlight brightness value B is equal to the preset backlight brightness value A, and then continues to sample; if the second backlight brightness value B is greater than the first backlight brightness value A, the control circuit sets the preset step value and the preset delay according to the difference between A and B, the control circuit increases the backlight brightness according to the backlight brightness value and the corresponding preset step value n, the control circuit adds the corresponding preset delay after each changed backlight brightness value, the control circuit controls the change of the backlight brightness according to the backlight brightness value and the corresponding preset delay, judges whether the corresponding backlight brightness value B is less than or equal to the preset backlight brightness value A, if the corresponding backlight brightness value B is less than or equal to the preset backlight brightness value A, the control circuit continues to increase the backlight brightness according to the backlight brightness value and the corresponding preset step value n, until the corresponding backlight brightness value B is equal to the preset backlight brightness value A, and then continues to sample, to realize smooth control of the change of the backlight brightness and reduce the degree of eye fatigue.

[0117] In yet another embodiment, the analog-to-digital conversion sampling circuit samples and converts the digital current signal in a second preset sampling mode, and the control circuit adjusts the brightness of the backlight in a third preset adjustment mode based on the digital current signal, i.e., converts the digital current signal in the variation along time into a corresponding backlight brightness value, and if the second adjusted backlight brightness value is not equal to the preset first backlight brightness value, the control circuit needs to adjust the second backlight brightness value to the first backlight brightness value. If the second backlight brightness value B1 (e.g., 20 mcd) is greater than the first backlight brightness value A1 (e.g., 10 mcd), the brightness difference value between the second backlight brightness value B1 and the first backlight brightness value A1 is obtained, indicating that the change from the first backlight brightness value to the second backlight brightness value is an increase in brightness, and the control circuit controls the first backlight brightness value A1 to gradually increase by a preset step value, and after each time the brightness value is increased by a preset gradient, the brightness value is maintained for a preset delay time corresponding to the preset gradient for a preset delay time, until the second backlight brightness value B1, to achieve smooth control of the change in backlight brightness and reduce eye fatigue. Conversely, if the second backlight brightness value B2 (e.g., 20 mcd) is less than the first backlight brightness value A2 (e.g., 30 mcd), the brightness difference value between the second backlight brightness value B2 and the first backlight brightness value A2 is obtained, indicating that the change from the first backlight brightness value to the second backlight brightness value is a decrease in brightness, and the control circuit controls the first backlight brightness value A2 to gradually decrease by a preset step value, and after each time the brightness value is decreased by a preset gradient, the brightness value is maintained for a preset delay time corresponding to the preset gradient for a preset delay time, until the second backlight brightness value B2, to achieve smooth control of the change in backlight brightness and reduce eye fatigue. Until the second backlight brightness value is equal to the first backlight brightness value, no further adjustment is required. It should be noted that in this embodiment, the preset step value and the corresponding preset delay time are not limited and are set according to the change in ambient light and the range of brightness change of the backlight, e.g., the preset step value is set to 1 mcd, 2 mcd, 5 mcd, 10 mcd, etc.

[0118] It should be noted that in some embodiments, the preset conditions, analog signals, preset sampling modes and preset adjustment modes are one-to-one corresponding, facilitating the use of a more suitable preset sampling mode for sampling according to the change in ambient light, and a more comfortable preset adjustment mode for adjusting the backlight brightness, improving people's experience of the display device.

[0119] Figure 8 To show part of the connection diagram of the light sensing adjustment circuit, as Figure 8As shown, the photoelectric sensing circuit 10 outputs an analog signal based on the change of the ambient light meeting the preset condition, the non-inverting input terminal "+" of the operational amplifier U1 is connected to the analog signal and performs amplification, the output terminal of the operational amplifier U1 outputs the amplified analog signal and forms a square wave with a vertical change edge, the first end of the first resistor R1 receives the amplified analog signal, the first capacitor C1 performs smoothing processing on the square wave with a vertical change edge based on the capacitor charging and discharging rule to form a waveform with a gentle change edge, the analog-to-digital conversion sampling circuit 40 performs sampling in a preset sampling mode on the gentle change edge and converts the analog signal into a digital signal, and the control circuit 50 adjusts the brightness of the backlight source 60 in a preset adjustment mode based on the digital signal. Since the preset condition, the analog signal, the preset sampling mode and the preset adjustment mode are one-to-one corresponding, it is convenient to sample in a more suitable preset sampling mode according to the change of the ambient light and to adjust the backlight brightness in a preset adjustment mode which is more comfortable for the human eye, thereby improving the experience of people on the display device.

[0120] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0121] The beneficial effects of the present embodiment compared with the prior art are:

[0122] The present embodiment is applied to a light sensing adjustment circuit, which comprises a photoelectric sensing circuit, an amplification circuit, a smoothing circuit, an analog-to-digital conversion sampling circuit, a control circuit and a backlight source. The photoelectric sensing circuit is connected to the amplification circuit, the amplification circuit is connected to the smoothing circuit, the smoothing circuit is connected to the analog-to-digital conversion sampling circuit, the analog-to-digital conversion sampling circuit is connected to the control circuit, and the control circuit is connected to the backlight source. The light sensing adjustment method comprises the following steps: if the change of the ambient light meets a preset condition, the photoelectric sensing circuit outputs an analog signal; the amplification circuit receives and amplifies the analog signal to output an amplified analog signal; the smoothing circuit receives the amplified analog signal and smoothes the change edge of the amplified analog signal; the analog-to-digital conversion sampling circuit samples in a preset sampling mode within the time of the smoothed change edge of the amplified analog signal and converts the amplified analog signal into a digital signal; and the control circuit receives the digital signal and adjusts the brightness of the backlight source in a preset adjustment mode based on the digital signal. Compared with the prior art, instead of directly switching the adjustment mode of the backlight brightness according to the brightness of the ambient light, the preset adjustment mode is used to adjust the backlight brightness based on various situations of the change of the brightness of the ambient light, so that the human eye is more easily adapted to the change of the backlight brightness caused by the change of the ambient light, thereby improving the experience of people on the change of the display brightness of the liquid crystal display device.

[0123] In a second aspect, as Figure 9As shown, the embodiment of the present application provides a display device 100, comprising a display panel 110 and a driving module 120, the display panel 110 is electrically connected with the driving module 120, the driving module 120 comprises a photosensitive adjustment circuit 121, the photosensitive adjustment circuit 121 is used for executing the photosensitive adjustment method as any one of the first aspect contents.

[0124] It can be understood that the beneficial effects of the above-mentioned second aspect can be referred to the related description in the above-mentioned first aspect content, which will not be repeated here.

[0125] The photosensitive adjustment method of the backlight brightness provided by the embodiment of the present application can be applied to terminal devices such as mobile phones, tablet computers, wearable devices, vehicle-mounted devices, augmented reality (AR) / virtual reality (VR) devices, notebook computers, ultra-mobile personal computers (UMPC), netbooks, personal digital assistants (PDA), etc. The specific type of the terminal device is not limited by the embodiment of the present application.

[0126] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0127] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in the present text can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0128] In the embodiments provided in the present application, it should be understood that the disclosed apparatus / network device and method can be implemented in other ways. For example, the apparatus / network device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection between each other can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0129] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may also be distributed to multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment scheme according to actual needs.

[0130] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for photosensitive adjustment of backlight brightness, characterized in that, An application is made in a photosensitizing circuit, the photosensitizing circuit including a photoelectric sensing circuit, an amplification circuit, a smoothing circuit, an analog-to-digital conversion sampling circuit, a control circuit, and a backlight. The photoelectric sensing circuit is connected to the amplification circuit, the amplification circuit is connected to the smoothing circuit, the smoothing circuit is connected to the analog-to-digital conversion sampling circuit, the analog-to-digital conversion sampling circuit is connected to the control circuit, and the control circuit is connected to the backlight. The photosensitizing method includes: If the change in ambient light meets the preset conditions, the photoelectric sensing circuit outputs an analog signal; The amplifier circuit receives and amplifies the analog signal, outputting an amplified analog signal. The smoothing circuit receives the amplified analog signal and smooths out the transition edges of the amplified analog signal; The analog-to-digital conversion sampling circuit samples the amplified analog signal in a preset sampling mode within the time frame of the gradual change of the amplified analog signal, and converts the amplified analog signal into a digital signal. The control circuit receives the digital signal and adjusts the brightness of the backlight according to a preset adjustment method based on the digital signal. The analog signal includes a first analog signal and a second analog signal, the preset conditions include a first preset condition and a second preset condition, and the ambient light brightness level includes multiple preset brightness levels; The step of the photoelectric sensing circuit outputting an analog signal if the change in ambient light meets a preset condition includes: If the change in ambient light meets the first preset condition, the first analog signal is output; the first preset condition is that the preset brightness level before and after the change in ambient light is greater than or equal to the preset brightness level threshold. If the change in ambient light satisfies the second preset condition, the second analog signal is output; the second preset condition is that the preset brightness level before and after the change in ambient light is both less than the preset brightness level threshold.

2. The method as described in claim 1, characterized in that, The analog signal also includes a third analog signal and a fourth analog signal, and the preset conditions also include a third preset condition and a fourth preset condition; The step of the photoelectric sensing circuit outputting an analog signal if the change in ambient light meets a preset condition further includes: If the change in ambient light satisfies the third preset condition, the third analog signal is output. If the change in ambient light satisfies the fourth preset condition, the fourth analog signal is output.

3. The method as described in claim 2, characterized in that, The third preset condition is that the change in the brightness level of the ambient light is greater than or equal to two preset brightness levels; The fourth preset condition is that the change in the brightness level of the ambient light is less than two preset brightness levels.

4. The method as described in claim 1, characterized in that, The amplification circuit includes an operational amplifier, the non-inverting input of which is connected to the photoelectric sensing circuit, and the amplified output of which is connected to the smoothing circuit. The step of the amplifier circuit receiving and amplifying the analog signal and outputting the amplified analog signal includes: The operational amplifier receives the analog signal at its non-inverting input and amplifies the analog signal. The operational amplifier outputs the amplified analog signal to the smoothing circuit.

5. The method according to any one of claims 1 to 4, characterized in that, The smoothing circuit includes a first resistor and a first capacitor. The first end of the first resistor is connected to the amplification circuit, the second end of the first resistor is connected to the first end of the first capacitor and the analog-to-digital conversion sampling circuit, and the second end of the first capacitor is connected to the power supply ground. The step of the smoothing circuit receiving the amplified analog signal and smoothing the changing edges of the amplified analog signal includes: The first terminal of the first resistor receives the amplified analog signal; The first capacitor smooths the change edges of the amplified analog signal based on capacitor charging or discharging.

6. The method as described in claim 5, characterized in that, The preset adjustment method includes a first preset adjustment method; The step of adjusting the brightness of the backlight based on the digital signal using a preset adjustment method includes: The brightness of the backlight is adjusted based on the digital signal using the first preset adjustment method, wherein the first preset adjustment method is to obtain a gradient sampling signal by performing a preset number of samplings on the change edge of the smoothed amplified analog signal of the digital signal, and to adjust the brightness based on the gradient sampling signal.

7. The method as described in claim 1, characterized in that, The preset adjustment method also includes a second preset adjustment method and a third preset adjustment method; The step of adjusting the brightness of the backlight based on the digital signal using a preset adjustment method includes: The brightness of the backlight is adjusted according to the digital signal using the second preset adjustment method, wherein the second preset adjustment method is to adjust according to the preset duty cycle corresponding to the digital signal. or The brightness of the backlight is adjusted according to the digital signal using the third preset adjustment method, wherein the third preset adjustment method is to adjust the brightness according to the corresponding backlight brightness value converted from the digital signal.

8. The method as described in claim 1, characterized in that, In the preset adjustment method, a preset step value and a preset duration are set between each adjustment.

9. A display device, characterized in that, The device includes a display panel and a driving module, the display panel being electrically connected to the driving module, and the driving module including a photosensitizing circuit for performing the photosensitizing method as described in any one of claims 1 to 8.

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