Brightness adjusting method, circuit, chip and display equipment

Abstract

The invention discloses a brightness adjusting method and circuit, a chip and display equipment. The brightness adjusting method comprises the following steps: dividing a frame period into at least one sub-period; a plurality of brightness binding points are arranged in the brightness adjusting range, the brightness adjusting range is divided into a plurality of wave bands by the brightness binding points, and each wave band has a corresponding display brightness range and pulse frequency; according to two brightness binding points adjacent to the target brightness value, obtaining a band to which the target brightness value belongs so as to obtain a target pulse frequency corresponding to the target brightness value; obtaining the total screen-on duration of the target brightness value in any sub-period according to the band to which the target brightness value belongs; obtaining the screen-on duration of a single pulse in the pulse signal according to the total screen-on duration of the target brightness value in the sub-period and the target pulse frequency; and adjusting the pulse signal according to the screen-on duration of the single pulse and the target pulse frequency so as to adjust the display brightness. The circuit area is reduced; and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a brightness adjustment method, circuit, chip and display device. Background Art

[0002] With the development of display technology, display devices are becoming more diverse (such as LED, OLED, AMOLED, LCD, etc.). The brightness adjustment of display devices is completed by adjusting the display brightness value (DBV), which usually includes two dimming methods: pulse width modulation (PWM) dimming and direct current (DC) dimming.

[0003] Figure 1 The schematic diagram of PWM dimming is shown in Figure 2. Figure 1 As shown in the figure, in PWM dimming mode, the display brightness value is controlled by adjusting the pulse width to control the time ratio of the bright screen and the dark screen in the pulse cycle. During PWM dimming, due to the phenomenon of visual persistence, even if the screen of the display device is always flashing "bright → dark → bright", the human eye will ignore the dark screen stage and see a continuous bright screen.

[0004] The visual persistence of the human eye is limited. When the pulse frequency is low, the lower the DBV, the longer the dark screen time of a single pulse, the easier it is for users to feel the screen flickering and the poor display effect. In this case, using the display device for a long time will also cause eye fatigue, which greatly affects the user experience. In order to solve this problem, the prior art adopts a low-brightness and high-frequency PWM dimming method. The DBV value range is divided into multiple bands (Bands). In the Band with a lower DBV, the pulse frequency is increased, the single pulse cycle is shortened, and the dark screen time of a single pulse is also shortened, making it difficult for the human eye to perceive the screen dimming, which is conducive to improving the display effect.

[0005] In the prior art, the dimming curve is fitted by linear interpolation. Specifically, multiple brightness binding points are set within the value range of DBV, and the screen-on duration t of a single pulse corresponding to each brightness binding point is obtained. The relationship between the screen-on duration of a single pulse between two adjacent brightness binding points and DBV is regarded as a linear relationship, and the dimming curve between the binding points is fitted, thereby obtaining the dimming curve within the value range of DBV.

[0006] Figure 2In the low-brightness and high-frequency PWM dimming curve diagram shown, DBV is used as the x-axis, the screen-on duration t of a single pulse is used as the y-axis, and the DBV value range is divided into 5 Bands as an example, and each Band corresponds to a pulse frequency. In order to fit the PWM dimming curve while ensuring the display effect, it is necessary to fit the dimming curves corresponding to each pulse frequency within the DBV value range (i.e., L1~L5 in the figure), and obtain the dimming curve actually used in the dimming process by intercepting the curve segment of the corresponding dimming curve in each Band corresponding to the DBV change interval of the Band. In order to fit multiple dimming curves L1~L5, the number of brightness binding points that need to be set also increases exponentially, and the required hardware storage and computing resources will also increase exponentially, which increases the production cost and is not conducive to reducing the hardware area. Summary of the invention

[0007] In view of the above problems, the purpose of this application is to provide a brightness adjustment method, circuit, chip and display device, which can save the storage and computing resources required for low-brightness and high-frequency PWM dimming mode and reduce production costs.

[0008] According to one aspect of the present application, a brightness adjustment method is provided, wherein, within a brightness adjustment range, the brightness adjustment method adjusts the pulse frequency of a pulse signal and the duty cycle of a single pulse according to a target brightness value, and the brightness adjustment method comprises: dividing a frame period into at least one sub-period; setting a plurality of brightness binding points within the brightness adjustment range, at least some of the brightness binding points dividing the brightness adjustment range into a plurality of bands, each of the bands having its corresponding display brightness range and the pulse frequency; obtaining the band to which the target brightness value belongs according to two brightness binding points adjacent to the target brightness value to obtain the target pulse frequency corresponding to the target brightness value; obtaining the total screen-on time of the target brightness value in any sub-period according to the two brightness binding points adjacent to the target brightness value; obtaining the screen-on time of a single pulse in the pulse signal according to the total screen-on time of the target brightness value in the sub-period and the target pulse frequency; and providing the pulse signal according to the screen-on time of the single pulse and the target pulse frequency to adjust the display brightness.

[0009] Optionally, the method for obtaining the total screen-on time of the target brightness value in any sub-cycle includes: fitting a dimming curve in any sub-cycle based on the multiple brightness binding points, the dimming curve characterizing the relationship between the total screen-on time and the brightness value in the sub-cycle; and obtaining the total screen-on time of the target brightness value in the sub-cycle based on the dimming curve.

[0010] Optionally, the method for formulating the dimming curve includes: obtaining the total screen-on time of each brightness binding point in any sub-period; and fitting the dimming curve between adjacent brightness binding points according to a linear interpolation algorithm.

[0011] Optionally, the method for obtaining the screen-on time of a single pulse in the pulse signal includes: obtaining the number of pulses in any sub-period based on the target pulse frequency; and obtaining the screen-on time of the single pulse based on the total screen-on time corresponding to the target brightness value and the number of pulses.

[0012] Optionally, the smaller the brightness value of the display brightness range corresponding to the band is, the higher the pulse frequency corresponding to the band is.

[0013] Optionally, the frame period is divided into a plurality of sub-periods, and the duration of each sub-period is equal.

[0014] Optionally, the brightness adjustment method further includes: when the target brightness value exceeds the brightness adjustment range, adjusting the display brightness by adjusting the supply voltage.

[0015] According to another aspect of the present application, a brightness adjustment circuit is provided, wherein, within a brightness adjustment range, the brightness adjustment circuit adjusts the pulse frequency of a pulse signal and the duty cycle of a single pulse according to a target brightness value, and the brightness adjustment circuit comprises: a storage unit for storing a plurality of brightness binding points within the brightness adjustment range, at least some of the brightness binding points dividing the brightness adjustment range into a plurality of bands, the storage unit further for storing a display brightness range corresponding to each of the bands and the pulse frequency; a selection unit for selecting the band to which the target brightness value belongs and the target pulse frequency corresponding to the target brightness value according to two brightness binding points adjacent to the target brightness value; a calculation unit for obtaining the total screen-on time corresponding to the target brightness value in any sub-period according to two brightness binding points adjacent to the target brightness value, the frame period comprising at least one of the sub-periods, the calculation unit further for obtaining the screen-on time of a single pulse in the pulse signal according to the total screen-on time corresponding to the target brightness value and the target pulse frequency; and a pulse signal generating unit for providing the pulse signal according to the screen-on time of the single pulse and the target pulse frequency to adjust the display brightness.

[0016] Optionally, the brightness adjustment circuit further includes: a clock gating unit, configured to enable the storage unit, the selection unit, the calculation unit and the pulse signal generation unit when the target brightness value changes.

[0017] Optionally, the selection unit includes: a first selection module, which obtains two brightness binding points adjacent to the target brightness value according to the target brightness value; a second selection module, which obtains the total screen-on time of the two brightness binding points in any sub-period according to the two brightness binding points adjacent to the target brightness value, and the storage unit is also used to store the total screen-on time of each brightness binding point in any sub-period; and a third selection module, which obtains the target pulse frequency according to the target brightness value.

[0018] Optionally, the calculation unit includes: a first calculation module, which calculates the total screen-on time of the target brightness value in any sub-period according to the total screen-on time of two adjacent brightness binding points of the target brightness value in the sub-period; and a second calculation module, which calculates the screen-on time of the single pulse period according to the total screen-on time of the target brightness value in the sub-period and the target pulse frequency.

[0019] Optionally, the smaller the brightness value of the display brightness range corresponding to the band is, the higher the pulse frequency corresponding to the band is.

[0020] Optionally, the frame period is divided into a plurality of sub-periods, and the duration of each sub-period is equal.

[0021] Optionally, when the target brightness value exceeds the brightness adjustment range, the brightness adjustment circuit further adjusts the display brightness by adjusting the power supply voltage.

[0022] According to a third aspect of the present application, a chip is provided, comprising a brightness adjustment circuit as described in any one of the above items.

[0023] According to a fourth aspect of the present application, a display device is provided, comprising a brightness adjustment circuit as described in any one of the above items.

[0024] According to the brightness adjustment method, circuit, chip and display device provided by the present application, any sub-period in the frame period is used as the basis for calculation. Since the number of pulses in the sub-period is different at the pulse frequencies corresponding to different bands. Therefore, after obtaining the total screen-on time of a set of brightness binding points in the sub-period, the screen-on time of a single pulse period corresponding to the target brightness value can be obtained by combining the pulse frequency corresponding to the band to which the target brightness value belongs, thereby providing a corresponding pulse signal to adjust the display brightness. The storage resources and computing resources required in the brightness adjustment process are greatly reduced, which is conducive to cost savings.

[0025] Furthermore, by dividing the frame period into multiple equal-length sub-periods, it is easier to obtain the total screen-on duration of each brightness binding point in the sub-period. At the same time, the bit width can be reduced during the interpolation calculation process, further reducing the corresponding circuit area, which is conducive to the development of highly integrated chips.

[0026] Furthermore, by controlling the clock gating of each circuit unit in the brightness adjustment circuit, each circuit unit is enabled only when calculation is required, which can effectively reduce the power consumption of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0028] Figure 1 Shows the PWM dimming principle diagram;

[0029] Figure 2 The PWM dimming curve diagram of low brightness and high frequency is shown;

[0030] Figure 3 A schematic flow chart showing the brightness adjustment method of the present application is shown;

[0031] Figure 4 A schematic flow chart showing the total screen-on duration of obtaining the target brightness value in a sub-period;

[0032] Figure 5 A schematic diagram showing a dimming curve within a sub-period and a dimming curve at each frequency;

[0033] Figure 6 A schematic structural diagram of a display device of the present application is shown;

[0034] Figure 7 A schematic structural diagram of the brightness adjustment circuit of the present application is shown. DETAILED DESCRIPTION

[0035] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0036] Certain terms are used in this specification and claims to refer to specific components. It should be understood by those skilled in the art that manufacturers may use different terms to refer to the same component. This specification and claims do not distinguish components by differences in name, but by differences in function.

[0037] It should be understood that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by programmable circuits. When an element or circuit is said to be "connected to" another element or an element or circuit is said to be "connected between" two nodes, it may be directly coupled or connected to another element or there may be an intermediate element, and the connection between the elements may be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0038] In addition, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0039] It should also be noted that, in the various methods and processes of the present application, the size of the step numbers does not mean the order of execution, nor does it constitute any limitation on the implementation process of the embodiments of the present application.

[0040] Figure 3 The schematic flow chart of the brightness adjustment method of the present application is shown. The brightness adjustment method provided by the present application adjusts the pulse frequency of the pulse signal and the duty cycle of a single pulse according to the target brightness value within a preset brightness adjustment range to adjust the display brightness. Figure 3 As shown, the brightness adjustment method provided by the present application includes the following steps:

[0041] In step S11, a frame period is divided into at least one sub-period.

[0042] In some embodiments, the frame period is divided into a plurality of sub-periods to reduce the bit width in the subsequent interpolation calculation process, thereby reducing the area of ​​the corresponding calculation circuit, which is conducive to the highly integrated development of the chip.

[0043] Furthermore, the durations of the multiple sub-cycles are equal, which can reduce the difficulty of obtaining the total screen-on duration of each brightness value within the sub-cycle, and is conducive to improving the accuracy of dimming.

[0044] In step S12, a plurality of brightness binding points are set within the brightness adjustment range.

[0045] At least some of these brightness binding points divide the brightness adjustment range into multiple bands, and each band has its corresponding display brightness range and pulse frequency. Among them, the smaller the brightness value of the display brightness range corresponding to the band, the higher the pulse frequency corresponding to the band. Through the low-brightness and high-frequency dimming method, even when the brightness value is low, the human eye is not easy to detect the dark screen stage, which is conducive to improving the display quality and user experience. However, it should be understood that the present application is not limited to this. For example, the method provided in the present application can also be applied to the situation where the smaller the brightness value, the smaller the pulse frequency corresponding to the band.

[0046] It should be understood that the more brightness binding points are set within the brightness adjustment range, the more accurate the brightness adjustment result will be. However, the increase in the number of brightness binding points will also increase the required storage resources. Designers can determine the number of brightness binding points according to actual needs, and this application does not impose too many restrictions.

[0047] Furthermore, in some embodiments, each brightness binding point is evenly distributed within the brightness adjustment range, that is, the difference in brightness between any two adjacent brightness binding points is the same. In some other embodiments, the brightness binding point can be set according to the rate of change of the screen-on duration with the brightness value, and the higher the rate of change, the more brightness binding points there are (for example, under the same brightness value change range, the smaller the brightness value, the more brightness binding points there are).

[0048] In step S13, the band to which the target brightness value belongs is obtained according to two brightness binding points adjacent to the target brightness value to obtain the target pulse frequency corresponding to the target brightness value;

[0049] In this step, two binding points adjacent to the target brightness value are determined according to the target brightness value, and the target brightness value falls within the brightness value interval determined by the two brightness binding points. The band to which the two adjacent binding points belong is the band to which the target brightness value belongs, and the pulse frequency of the band is the pulse frequency corresponding to the target brightness value.

[0050] In step S14, the total screen-on duration of the target brightness value in any sub-period is obtained according to two brightness binding points adjacent to the target brightness value (which will be described in detail below);

[0051] In step S15, the screen-on duration of a single pulse in the pulse signal is obtained according to the total screen-on duration of the target brightness value in the sub-period and the target pulse frequency;

[0052] Specifically, the specific steps of obtaining the screen-on duration of a single pulse include:

[0053] The number of pulses in the sub-period is calculated based on the target pulse frequency obtained in step S13; and

[0054] The screen-on time of a single pulse is calculated based on the total screen-on time of the sub-period in accordance with the target brightness value obtained in step S14 and the number of pulses obtained in the above steps.

[0055] In step S16, a pulse signal is provided according to the screen-on duration of a single pulse and the target pulse frequency to adjust the display brightness.

[0056] Figure 4 A schematic flow chart of obtaining the total screen-on duration of the target brightness value in a sub-period is shown. Figure 4 As shown, obtaining the total screen-on duration of the target brightness value in a sub-period includes the following steps:

[0057] In step S21, the total screen-on duration of each brightness binding point in the same sub-period is obtained;

[0058] In step S22, a dimming curve between adjacent brightness binding points is fitted according to a linear interpolation algorithm to obtain a dimming curve of the sub-period, where the dimming curve of the sub-period represents the relationship between the total screen-on time and the brightness value in the sub-period;

[0059] In step S23, the total screen-on time of the target brightness value in the sub-period is obtained according to the dimming curve.

[0060] Furthermore, in the brightness adjustment method of the present application, there are no excessive restrictions on the situation where the target brightness value exceeds the preset range. For example, in some embodiments, if the target brightness value is greater than the maximum brightness value in the preset brightness adjustment range, the direct current (DC) dimming method is selected, that is, the power supply voltage is adjusted to adjust the display brightness. The user's visual experience can be further enhanced through the mixed dimming of PWM and DC.

[0061] Figure 5 A schematic diagram showing the dimming curve in a sub-period and the dimming curve at each frequency is shown. Figure 5 The brightness adjustment method provided in this application is further explained.

[0062] exist Figure 5 As an example, the preset brightness adjustment range of the brightness value is [0, δ10]. Within this brightness adjustment range, dimming is performed by low-brightness and high-frequency PWM dimming, that is, the pulse frequency of the pulse signal and the duty cycle of a single pulse are adjusted according to the target brightness value to adjust the plane brightness. When the target brightness value exceeds the brightness adjustment range (that is, when the target brightness value is greater than δ10), dimming is performed by DC dimming, that is, the supply voltage is adjusted to adjust the display brightness.

[0063] like Figure 5As shown, according to the brightness adjustment method provided in the present application, the frame period is divided into three sub-periods of equal duration as an example, that is, the duration of any sub-period = 1 / 3T, where T is the frame period.

[0064] A total of 11 brightness binding points are set within the preset adjustment range of the brightness value, namely 0, δ1-δ10. Among them, the brightness adjustment range is divided into 5 bands by binding points 0, δ2, δ4, δ6, δ8 and δ10, and each band corresponds to a pulse frequency. Among them, the bands of pulse frequency from large to small are [0, δ2], [δ2, δ4], [δ4, δ6], [δ6, δ8], [δ8, δ10].

[0065] Get the total screen-on time of each brightness binding point within 1 / 3T, regard the area between two adjacent binding points as a linear line, and use a linear interpolation algorithm to fit the dimming curve L6 (i.e., the dimming curve prepared according to the binding points in this application) in which the total screen-on time in the sub-period changes with the brightness value.

[0066] Take the brightness value xA corresponding to point A as the target brightness value, and determine the two brightness binding points adjacent to xA as δ4 and δ5 among multiple brightness binding points. Among them, the total screen-on time of brightness binding point δ4 at 1 / 3T is y1; the total screen-on time of brightness binding point δ5 at 1 / 3T is y2 (brightness binding point δ4 corresponds to point B, and brightness binding point δ5 corresponds to point C). Based on the dimming curve L6, the total screen-on time of the target brightness value xA at 1 / 3T can be calculated using the linear interpolation algorithm as yA.

[0067] According to the band [δ4, δ6] to which the target brightness value xA belongs, the pulse frequency corresponding to the target brightness value xA is obtained, that is, the total number of pulses within 1 / 3T is obtained. Dividing yA evenly into these pulse numbers, the screen-on duration of a single pulse cycle can be obtained as yD (that is, corresponding to point D).

[0068] like Figure 5 As shown, taking 5 bands as an example, the actual dimming curve calculated based on the dimming curve L6 prepared according to a set of binding points in this application is completely consistent with the actual dimming curve obtained by respectively preparing dimming curves L1 to L5 through five sets of binding points in the prior art. Therefore, under the condition of achieving the same display quality, the brightness adjustment method provided by this application can greatly reduce the computing resources and storage resources required for dimming.

[0069] It should be understood that in the actual calculation process, it is usually only necessary to obtain the target pulse frequency corresponding to the target brightness value and the screen-on time of a single pulse based on the target brightness value, without calculating the entire dimming curve.

[0070] According to the brightness adjustment method provided by the present application, any sub-period in the frame period is used as the basis for calculation. Since the number of pulses in the sub-period is different at the pulse frequencies corresponding to different bands. Therefore, after obtaining the total screen-on time of a set of brightness binding points in the sub-period, the screen-on time of a single pulse period corresponding to the target brightness value can be obtained by combining the pulse frequency corresponding to the band to which the target brightness value belongs, thereby providing a corresponding pulse signal to adjust the display brightness. The storage resources and computing resources required in the brightness adjustment process are greatly reduced, which is conducive to cost savings.

[0071] Furthermore, by dividing the frame period into multiple equal-length sub-periods, it is easier to obtain the total screen-on duration of each brightness binding point in the sub-period. At the same time, the bit width can be reduced during the interpolation calculation process, further reducing the corresponding circuit area, which is conducive to the development of highly integrated chips.

[0072] Figure 6 Schematic diagram of the structure of the display device of the present application is shown. Figure 6 In the illustrated embodiment, a liquid crystal display device (LCD) is used as an example. However, it should be understood that the display device of the present application should not be limited thereto, and may also be, for example, a light emitting diode display device (LED), an organic light emitting diode display device (OLED), an active matrix organic light emitting diode (AMOLED), or any other display device that can adjust the brightness by PWM dimming.

[0073] like Figure 6 As shown, the display device 10 includes a display module 11 , a backlight module 12 , a source driving circuit 13 , a gate driving circuit 14 , a backlight driving circuit 15 and a timing control circuit 16 .

[0074] The timing control circuit 16 is connected to the source driving circuit 13 and the gate driving circuit 14, respectively. The timing control circuit 16 sends a first control signal Cont1 to the gate driving circuit 14 and sends a second control signal Cont2 and a data signal Data to the source driving circuit 13 based on, for example, image data IMG and a control signal Cont (for example, including a vertical synchronization signal, a horizontal synchronization signal, and a data enable signal) provided externally. The gate driving circuit 14 outputs a scanning voltage according to the first control signal Cont1. The data driving circuit 13 converts the data signal Data into a data voltage of an analog type according to the second control signal Cont2 and outputs it.

[0075] The display module 11 includes, for example, a plurality of pixel units arranged in an array ( Figure 3 ), a plurality of data lines DL and a plurality of scanning lines GL (not specifically shown in FIG. Figure 3 A scan line GL and a data line DL are shown as examples). For example, a plurality of data lines DL are arranged in parallel along a first direction (the x direction shown in the figure) and extend along a second direction (the y direction shown in the figure); for example, a plurality of scan lines GL are arranged in parallel along the second direction and extend along the first direction. The first direction is optionally perpendicular to the second direction, in which case the first direction is the row direction and the second direction is the column direction. The display module 11 is connected to the source driving circuit 13 through a plurality of data lines DL, and is connected to the gate driving circuit 14 through a plurality of scan lines GL. Specifically, the source driving circuit 13 includes a plurality of data channels, and the gate driving circuit 14 includes a plurality of scan channels. Each data line DL is connected to a data channel of the source driving circuit 13 and a column of pixel units; each scan line GL is connected to a scan channel of the gate driving circuit 14 and a row of pixel units, so that each pixel unit receives a scan voltage through the corresponding scan line GL and receives a data voltage through the corresponding data line DL for display.

[0076] For LCD display devices, since liquid crystal molecules themselves do not emit light, a backlight module 12 is required to provide a light source.

[0077] The display device 10 also includes a brightness adjustment circuit 100. Within the brightness adjustment range, the brightness adjustment circuit 100 provides a pulse signal PWM with a certain pulse frequency and duty cycle to the backlight driving circuit 15 according to the target brightness value. The backlight driving circuit 15 generates a corresponding driving current according to the received PWM signal, and the driving current is provided to the backlight module 12 via the signal line BL to control the display brightness of the backlight module 12. When the target brightness value exceeds the brightness adjustment range, the brightness adjustment circuit 100 can also adjust the driving current provided by the backlight driving circuit 15 by adjusting the power supply voltage, thereby adjusting the display brightness.

[0078] It should be noted that in Figure 6 In the embodiment, the brightness adjustment circuit 100 and the timing control circuit 16 are integrated on the same circuit board. However, it should be understood that in some embodiments, the brightness adjustment circuit 100 and the timing control circuit 16 can also be independent of each other or integrated with other circuits, and this application does not make too many restrictions.

[0079] Figure 7 A schematic structural diagram of the brightness adjustment circuit of the present application is shown (i.e. Figure 6 ). The brightness adjustment circuit 100 can be used to execute the brightness adjustment method provided in the present application.

[0080] like Figure 7 As shown, the brightness adjustment circuit 100 includes: a storage unit 110 , a selection unit 120 , a calculation unit 130 and a pulse signal generation unit 140 .

[0081] The storage unit 110 stores a plurality of brightness binding points within the brightness adjustment range (in Figure 4 Taking B1~Bn as an example), at least some of the brightness binding points divide the brightness adjustment range into multiple bands, and the storage unit is also used to store the display brightness range and pulse frequency corresponding to each band (in Figure 7 Take f1~fw as an example).

[0082] The smaller the brightness value of the band corresponding to the display brightness range, the higher the pulse frequency corresponding to the band. Through the low-brightness and high-frequency dimming method, even when the brightness value is low, the human eye is not easy to detect the dark screen stage, which is conducive to improving display quality and user experience.

[0083] It should be understood that the more brightness binding points are set within the brightness adjustment range, the more accurate the brightness adjustment result will be. However, the increase in the number of brightness binding points will also increase the required storage resources. Designers can determine the number of brightness binding points according to actual needs, and this application does not impose too many restrictions.

[0084] Furthermore, in some embodiments, each brightness binding point is evenly distributed within the brightness adjustment range, that is, the difference in brightness between any two adjacent brightness binding points is the same. In some other embodiments, the brightness binding point can be set according to the rate of change of the screen-on duration with the brightness value, and the higher the rate of change, the more brightness binding points there are (for example, under the same brightness value change range, the smaller the brightness value, the more brightness binding points there are).

[0085] In addition, the storage unit 110 is also used to store the total screen-on duration of any sub-period of each brightness binding point within the frame period (in Figure 7 Take WB1~WBn as an example).

[0086] The frame period includes at least one sub-period. In some embodiments, the frame period is divided into multiple sub-periods to reduce the bit width in the subsequent interpolation calculation process, thereby reducing the area of ​​the corresponding calculation circuit, which is conducive to the highly integrated development of the chip. Furthermore, the duration of these multiple sub-periods is equal, which can reduce the difficulty of obtaining the total screen-on duration of each brightness value in the sub-period, which is conducive to improving the accuracy of dimming.

[0087] The selection unit 120 is used to select a band to which the target brightness value belongs and a target pulse frequency corresponding to the target brightness value according to two adjacent brightness binding points of the target brightness value.

[0088] exist Figure 7In the illustrated embodiment, the selection unit 120 includes a first selection module 121 , a second selection module 122 and a third selection module 123 .

[0089] The first selection module 121 selects two brightness binding points adjacent to the target brightness value from among the plurality of brightness binding points according to the target brightness value. Figure 7 In the illustrated embodiment, the brightness values ​​corresponding to the two brightness binding points are x1 and x2 respectively, and the target brightness value falls within the brightness value interval [x1, x2] determined by the two brightness binding points.

[0090] The second selection module 122 obtains the total screen-on duration of the two brightness binding points in any sub-period according to the two brightness binding points adjacent to the target brightness value (i.e. Figure 7 y1 and y2 shown).

[0091] The third selection module 123 obtains the target pulse frequency according to the target brightness value. The band to which the two adjacent binding points obtained by the first selection module 121 belong is the band to which the target brightness value belongs, and the pulse frequency of the band is the pulse frequency corresponding to the target brightness value (i.e. Figure 7 As shown in F).

[0092] The calculation unit 130 obtains the total screen-on time corresponding to the target brightness value in the same sub-period based on the two adjacent brightness binding points of the target brightness value. The calculation unit is also used to obtain the screen-on time Ts of a single pulse in the pulse signal based on the total screen-on time Td corresponding to the target brightness value and the target pulse frequency F.

[0093] exist Figure 7 In the illustrated embodiment, the calculation unit 130 includes a first calculation module 131 and a second calculation module 132 .

[0094] The first calculation module 131 calculates the total screen-on duration Td of the target brightness value in the sub-period according to the total screen-on duration of two brightness binding points adjacent to the target brightness value in the same sub-period.

[0095] The second calculation module 132 calculates the screen-on duration Ts of a single pulse cycle according to the total screen-on duration of the target brightness value in the sub-cycle and the target pulse frequency F.

[0096] The pulse signal generating unit 140 is used to provide a pulse signal according to the screen-on duration of a single pulse and a target pulse frequency to adjust the display brightness.

[0097] Furthermore, in order to reduce the power consumption of the brightness adjustment circuit 100 in the present application, the brightness adjustment circuit 100 also includes a clock gating unit (not shown in the figure). The clock gating unit is used to enable the storage unit 110, the selection unit 120, the calculation unit 130 and the pulse signal generating unit 140 when the target brightness value changes. Specifically, the clock signals of the storage unit 110, the selection unit 120, the calculation unit 130 and the pulse signal generating unit 140 are controlled by the clock gating unit, so that the clock signals of these circuit units are only flipped in a few pixel rows in the display frame where the target brightness value changes, and these circuit units will work according to the flipping of the clock signal. For example, assuming that there are 3000 pixel rows in a single display frame, when the DBV changes, these circuit units will only be enabled to work in the non-display area of ​​2 to 3 pixel rows, and the power consumption is close to 0, which is conducive to extending the life of the device.

[0098] The brightness adjustment circuit provided by the present application can implement the brightness adjustment method provided by the present application, and thus also has the beneficial effects of any of the above embodiments. Furthermore, by clock gating control of each circuit unit in the brightness adjustment circuit, each circuit unit is enabled only when calculation is required, which can effectively reduce circuit power consumption.

[0099] The present application also provides a chip, which includes the above-mentioned brightness adjustment circuit, and thus also has the beneficial effects of any of the above-mentioned embodiments, which will not be described in detail here.

[0100] According to the embodiments of the present application as above, these embodiments do not describe all the details in detail, nor do they limit the present application to specific embodiments only. Obviously, according to the above description, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A brightness adjustment method, wherein: Within the brightness adjustment range, the brightness adjustment method adjusts the pulse frequency of the pulse signal and the duty cycle of a single pulse according to the target brightness value, and the brightness adjustment method includes: dividing a frame period into at least one sub-period; A plurality of brightness binding points are set within the brightness adjustment range, and at least some of the brightness binding points divide the brightness adjustment range into a plurality of bands, each of the bands having a corresponding display brightness range and the pulse frequency; Obtaining the band to which the target brightness value belongs according to two brightness binding points adjacent to the target brightness value to obtain a target pulse frequency corresponding to the target brightness value; Obtaining the total screen-on duration of the target brightness value in any sub-period according to two brightness binding points adjacent to the target brightness value; Obtaining the screen-on duration of a single pulse in the pulse signal according to the total screen-on duration of the target brightness value in the sub-period and the target pulse frequency; and The pulse signal is provided according to the screen-on duration of the single pulse and the target pulse frequency to adjust the display brightness.

2. The brightness adjustment method according to claim 1, wherein: The method for obtaining the total screen-on duration of the target brightness value in any sub-period includes: Fitting a dimming curve in any sub-period according to the multiple brightness binding points, the dimming curve representing a relationship between a total screen-on time and a brightness value in the sub-period; and The total screen-on time of the target brightness value in the sub-period is obtained according to the dimming curve.

3. The brightness adjustment method according to claim 2, wherein: The method for formulating the dimming curve includes: Obtaining the total screen-on duration of each brightness binding point in any sub-period; and The dimming curve between adjacent brightness binding points is fitted according to a linear interpolation algorithm.

4. The brightness adjustment method according to claim 1, wherein: The method for obtaining the screen-on duration of a single pulse in the pulse signal includes: Obtaining the number of pulses in any sub-period according to the target pulse frequency; and The screen-on time of the single pulse is obtained according to the total screen-on time corresponding to the target brightness value and the number of pulses.

5. The brightness adjustment method according to claim 1, wherein: The smaller the brightness value of the display brightness range corresponding to the band is, the higher the pulse frequency corresponding to the band is.

6. The brightness adjustment method according to claim 1, wherein: The frame period is divided into a plurality of sub-periods, and the duration of each sub-period is equal.

7. The brightness adjustment method according to claim 1, wherein: The brightness adjustment method further includes: When the target brightness value exceeds the brightness adjustment range, the display brightness is adjusted by adjusting the supply voltage.

8. A brightness adjustment circuit, wherein: Within the brightness adjustment range, the brightness adjustment circuit adjusts the pulse frequency of the pulse signal and the duty cycle of a single pulse according to the target brightness value, and the brightness adjustment circuit includes: a storage unit, used to store a plurality of brightness binding points within the brightness adjustment range, at least some of the brightness binding points dividing the brightness adjustment range into a plurality of bands, and the storage unit is further used to store a display brightness range corresponding to each of the bands and the pulse frequency; A selection unit, configured to select a band to which the target brightness value belongs and a target pulse frequency corresponding to the target brightness value according to two adjacent brightness binding points of the target brightness value; A calculation unit, used to obtain the total screen-on time corresponding to the target brightness value in any sub-period according to two adjacent brightness binding points of the target brightness value, wherein the frame period includes at least one of the sub-periods, and the calculation unit is further used to obtain the screen-on time of a single pulse in the pulse signal according to the total screen-on time corresponding to the target brightness value and the target pulse frequency; and A pulse signal generating unit is used to provide the pulse signal according to the screen-on duration of the single pulse and the target pulse frequency to adjust the display brightness.

9. The brightness adjustment circuit according to claim 8, wherein: The brightness adjustment circuit also includes: A clock gating unit is used to enable the storage unit, the selection unit, the calculation unit and the pulse signal generation unit when the target brightness value changes.

10. The brightness adjustment circuit according to claim 8, wherein: The selection unit comprises: A first selection module, acquiring two brightness binding points adjacent to the target brightness value according to the target brightness value; A second selection module, obtaining, according to two brightness binding points adjacent to the target brightness value, a total screen-on duration of the two brightness binding points in any sub-period, wherein the storage unit is further used to store the total screen-on duration of each brightness binding point in any sub-period; and The third selection module obtains the target pulse frequency according to the target brightness value.

11. The brightness adjustment circuit according to claim 10, wherein: The computing unit comprises: A first calculation module calculates the total screen-on time of the target brightness value in the sub-period according to the total screen-on time of two brightness binding points adjacent to the target brightness value in any sub-period; and The second calculation module calculates the screen-on time of the single pulse cycle according to the total screen-on time of the target brightness value in the sub-cycle and the target pulse frequency.

12. The brightness adjustment circuit according to claim 8, wherein: The smaller the brightness value of the display brightness range corresponding to the band is, the higher the pulse frequency corresponding to the band is.

13. The brightness adjustment circuit according to claim 8, wherein: The frame period is divided into a plurality of sub-periods, and the duration of each sub-period is equal.

14. The brightness adjustment circuit according to claim 8, wherein: When the target brightness value exceeds the brightness adjustment range, the brightness adjustment circuit further adjusts the display brightness by adjusting the supply voltage.

15. A chip comprising the brightness adjustment circuit according to any one of claims 8 to 14.

16. A display device, comprising the brightness adjustment circuit according to any one of claims 8 to 14.

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