Brightness adjusting method of display screen and display device

Abstract

The invention provides a brightness adjusting method of a display screen and a display device, and relates to the technical field of display, and the brightness adjusting method comprises the steps: determining a target dimming configuration in a plurality of dimming configurations, the dimming configuration comprising a corresponding relation between a light-emitting enable signal EM and a display brightness value DBV in a transition interval, the transition intervals are located between a PWM dimming interval and a DC dimming interval, the multiple transition intervals corresponding to the multiple dimming configurations are not completely the same, and in each transition interval, the duty ratio of the EM sequentially changes along with the change of the DBV; and adjusting the display brightness of the display screen according to the target dimming configuration. Based on the scheme, the brightness adjustment effect of the display screen can be well improved through brightness inversion.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a brightness adjustment method and a display device for a display screen. Background Art

[0002] Currently, display devices including Organic Light-Emitting Diode (OLED) screens often adjust display brightness through a hybrid dimming method, that is, a direct current (DC) dimming method is used when high brightness is required to ensure eye protection, and a pulse width modulation (PWM) dimming method is used when low brightness is required to ensure display effect.

[0003] When a hybrid dimming method of DC dimming and PWM dimming is used, there is a serious flickering problem at the switching inflection point of different dimming methods, which affects the brightness adjustment effect of the display device. In view of this, how to provide a brightness adjustment method with better performance is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a brightness adjustment method and a display device, which have better brightness adjustment effect.

[0005] In a first aspect, a method for adjusting the brightness of a display screen is provided, comprising: determining a target dimming configuration among a plurality of dimming configurations, the dimming configuration comprising a correspondence between a light-emitting enable signal EM and a display brightness value (display brightness value, DBV) in a transition interval, the transition interval being between a PWM dimming interval and a DC dimming interval, the plurality of transition intervals corresponding to the plurality of dimming configurations being not completely the same, and in each of the transition intervals, the EM changes sequentially with a duty cycle change of the DBV; and adjusting the display brightness of the display screen according to the target dimming configuration.

[0006] Through the technical solution provided by the embodiment of the present application, the transition intervals under different dimming configurations are not aligned, and EM changes sequentially with the duty cycle of DBV. This can avoid the situation where the EM signal of multiple DBVs remains unchanged. By controlling the duty cycle of the EM signal to change with DBV, the possibility of brightness reversal caused by the asynchronous PWM dimming and DC dimming is reduced, so as to improve the dimming effect in the transition interval. The technical solution of the embodiment of the present application can not only solve the dimming flicker problem at the inflection point between PWM dimming and DC dimming, but also will not produce brightness reversal in the transition interval, thereby better improving the brightness adjustment effect of the display screen.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the first end values ​​of the plurality of transition intervals are not completely the same but the second end values ​​are the same, the first end value is close to the PWM dimming interval, and the second end value is close to the DC dimming interval.

[0008] Based on the above technical solution, by setting the second end values ​​of multiple transition intervals at the available boundaries of DC dimming, the coverage range of the DC dimming method is guaranteed as much as possible, and the flickering frequency of DC dimming is lower than that of PWM, so that the eye protection effect of the display device is better.

[0009] In combination with the first aspect, in certain implementations of the first aspect, in each of the transition intervals, the number of pulses of the EM changes sequentially with the change of the DBV.

[0010] Based on the above technical solution, the transition interval can conveniently realize the transition between the number of EM pulses of PWM dimming and the number of EM pulses of DC dimming, thereby effectively realizing the transition between PWM dimming and DC dimming.

[0011] In combination with the first aspect, in certain implementations of the first aspect, a change value of the number of EM pulses adjacent to the DBV value is 1.

[0012] Based on the above technical solution, considering that the change of the number of EM pulses too quickly may also lead to insufficient transition and then flicker problems, each time a pulse is added from the DC dimming interval to the PWM dimming interval, it can ensure that the duty cycle of the EM signal does not remain unchanged and achieve a better transition effect.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the width of the pulse that changes in the EM is greater than 4 unit times and less than or equal to 16 unit times, wherein 1 unit time is the turn-on time of a row of pixels in the display screen.

[0014] Based on the above technical solution, the width of the pulse changing in EM is adjusted, that is, the pulse width is greater than 4H, so that it can fully match the characteristics of the light-emitting device in the display device and reduce the possibility of problems such as brightness inversion. Furthermore, the pulse width is designed to be less than or equal to 16H, which can ensure the accuracy of dimming and optimize the dimming effect.

[0015] In combination with the first aspect, in certain implementations of the first aspect, a width of the pulse that changes in the EM is 8 unit times.

[0016] Based on the above technical solution, the 8H EM pulse width better matches the characteristics of the light-emitting device (such as a TFT tube) in the display device, which can ensure that the light-emitting device is fully turned on and off, thereby ensuring that the EM pulse signal matches the display characteristics of the display panel in the display device, further improving brightness inversion.

[0017] In combination with the first aspect, in some implementations of the first aspect, the dimming configuration further includes a corresponding relationship between EM and DBV in a DC dimming interval and a corresponding relationship between EM and DBV in a PWM dimming interval.

[0018] In combination with the first aspect, in some implementations of the first aspect, in the DC dimming interval, the pulse number of the EM corresponding to the DBV is a first pulse number, and in the PWM dimming interval, the pulse number of the EM corresponding to the DBV is a second pulse number, the first pulse number is less than the second pulse number, and the difference between the second pulse number and the first pulse number is greater than 1. In the transition interval, as the DBV decreases successively, the pulse number of the EM corresponding to the DBV changes between the first pulse number and the second pulse number.

[0019] In combination with the first aspect, in some implementations of the first aspect, the dimming configuration further includes: a corresponding relationship between the light emitting data signal and the DBV in the transition interval.

[0020] In combination with the first aspect, in some implementations of the first aspect, the multiple dimming configurations correspond one-to-one to the multiple gamma curves GAMMA.

[0021] In a second aspect, a readable storage medium is provided, storing a computer program, which, when executed, implements the brightness adjustment method as described in any one of the implementations of the first aspect.

[0022] In a third aspect, a control device is provided, comprising: a processor and a memory, wherein the processor is used to read instructions stored in the memory, and when the processor executes the instructions, the control device implements the brightness adjustment method as described in any one of the implementation methods in the first aspect above.

[0023] In a fourth aspect, a display device is provided, comprising: a display screen; and a control device for sending a control signal to the display screen to execute the brightness adjustment method as described in any one of the implementations of the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a display device applicable to the present application.

[0025] Figure 2 It is a schematic diagram of the distribution of DC dimming and PWM dimming intervals provided in an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of an EM signal pulse changing with DBV provided in an embodiment of the present application.

[0027] Figure 4 It is a schematic diagram of a corresponding relationship curve between DBV and brightness provided in an embodiment of the present application.

[0028] Figure 5 It is a flowchart of a brightness adjustment method provided in an embodiment of the present application.

[0029] Figure 6 It is a schematic diagram of a distribution method of dimming intervals under a multi-group dimming configuration provided in an embodiment of the present application.

[0030] Figure 7 It is a schematic diagram of an EM signal pulse changing with DBV provided in an embodiment of the present application.

[0031] Figure 8 It is a schematic diagram of a corresponding relationship curve between DBV and brightness provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solution in the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0033] It should be noted that the terms "first", "second", "#A", "#B", etc. in the specification and claims of the present invention and the above-mentioned drawings are only for convenience of description and are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] The embodiments of the present application will present various aspects, embodiments or features around a system including multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all devices, components, modules, etc. discussed in conjunction with the figures. In addition, combinations of these schemes may also be used.

[0035] In addition, in the embodiments of the present application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0036] The business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the evolution of technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0037] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0038] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can be represented by: including the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0039] The present application relates to a display screen, which can be applied to a variety of fields and scenarios. As an example, the display screen can be applied to 3C electronic products of computers, communications and consumer electronics, including but not limited to televisions, mobile phones, computers, laptops, tablets, personal digital assistants (PDAs), car computers, wearable devices, gaming devices, photographing equipment, etc. The present application does not limit the specific type of electronic device in which the display screen is located.

[0040] In addition, the display screen involved in the present application may be a liquid crystal display (LCD) or an OLED display, a quantum dot light emitting diode (QLED) display, etc. The present application does not limit the specific type of the display screen.

[0041] Figure 1 A schematic structural diagram of a display device 100 applicable to the present application is shown.

[0042] like Figure 1 As shown, the display device 100 includes a display screen 101 and a control chip 102, and the two are electrically connected, wherein the display screen 101 has structures such as a light-emitting unit and a pixel circuit and is controlled by a control signal sent by the control chip to display an image; the control chip 102 includes a processor 1021 and a memory 1022, the memory 1022 is used to store computer programs, and the processor is used to read and execute instructions stored in the memory. The control chip 102 can send a variety of control signals, such as an EM enable signal that controls whether the light-emitting unit emits light, a data signal data that controls the brightness of the light-emitting unit, etc.

[0043] The display screen 101 includes multiple display brightnesses, each of which can be controlled by a DBV. By changing the DBV, the control signal sent by the control chip 102 to the display screen 101 will be changed, thereby changing the current level of the display brightness of the display device 100. For example, the value of DBV can be represented by 12-bit data. At this time, DBV has 4095 levels, which can correspond to different values ​​within the brightness range. As an example, the brightness range can be 100nit to 500nit, or other brightness ranges according to requirements.

[0044] In actual use, the correspondence between DBV and brightness value depends on the specific characteristics of the display device, including display luminescent materials, display structure design, and drive circuit design, and the brightness adjustment range of different display devices may be different, ranging from tens of nits to thousands of nits.

[0045] In order to facilitate understanding of the embodiments of the present application, the related concepts of display screen dimming are introduced below.

[0046] The dimming methods of display screens include direct current (DC) dimming and pulse width modulation (PWM) dimming.

[0047] First, let's introduce DC dimming. DC dimming adjusts the brightness of the display screen by changing the voltage or current of the control signal in the light control circuit. For example, the voltage or current of the light data signal in the pixel circuit is changed to adjust the light emission of the light-emitting unit. In this adjustment method, there will be no screen flicker, that is, the screen brightness is constant, and the stimulation to the human eye is small. However, in the case of low brightness, the adjustment ability of the control signal is high, and it is not easy to control it too accurately. At the same time, due to the difference in the luminous efficiency of the three light-emitting units of red, green and blue, color distortion and other problems may occur, so PWM dimming is required.

[0048] PWM dimming adjusts the brightness by controlling the on and off time of the pixel light-emitting unit. In this dimming method, the brightness of the pixel light-emitting unit can be constant, and the light-emitting time changes. For example, in the pixel circuit, the light-emitting unit can be controlled by the light-enable signal EM. In some embodiments, the light-emitting time of the light-emitting unit can be adjusted by adjusting the duty cycle of EM, thereby controlling the brightness. This method is efficient and stable, avoiding the problems of inaccurate color rendering and color distortion. However, this method may have a stroboscopic problem, which may cause imperceptible stimulation to the human eye, especially in low-frequency PWM dimming, which may have an adverse effect on vision.

[0049] Therefore, taking into account the respective usage limitations of DC dimming and PWM dimming, current display devices including OLED screens often adjust the display brightness through a hybrid dimming method, that is, DC dimming is used when high brightness (corresponding to high DBV value) is required to ensure eye protection effect, and PWM dimming is used when low brightness (corresponding to low DBV value) is required to ensure display effect.

[0050] In some embodiments, in the DC dimming interval, the number of pulses of the EM signal in one signal cycle (one frame image cycle) is set to be relatively small, such as 1 or 3 pulses, while in the PWM dimming interval, the number of pulses of the EM signal in one signal cycle is set to be relatively large, such as 12 or 32 pulses. When the brightness of the display screen is adjusted by sliding DBV, a sudden change in the number of pulses will occur at the switching inflection point between the DC dimming interval and the PWM dimming interval, resulting in a screen flicker problem visible to the naked eye. Currently, terminal manufacturers are paying more and more attention to the eye protection function of the display screen. When dimming in the PWM dimming interval, the number of pulses of the EM signal may be further increased, for example, to 36 pulses, making the flicker problem at the switching inflection point more serious.

[0051] In view of the above flickering problem, the present application embodiment proposes a feasible solution. Figure 2 To explain.

[0052] like Figure 2 As shown, the entire DBV value interval can be divided into: PWM dimming interval, transition interval and DC dimming interval from low to high. Among them, the PWM dimming interval uses PWM dimming, and the number of EM pulses in the interval remains unchanged. At this time, the adjustment of the duty cycle can be achieved by adjusting the width of the EM pulse. The DC dimming interval uses DC dimming, and the number of EM pulses also remains unchanged, and the number is smaller than the PWM dimming interval. The transition interval (also called the Diming interval) is a transition zone between the PWM dimming interval and the DC dimming interval, and EM pulse dimming (EM pulse dimming) can be used in this interval. For example, the number of EM pulses in the PWM dimming interval is the first pulse number, and the number of EM pulses in the DC dimming interval is the second pulse number. In the transition interval, the number of EM pulses can be gradually reduced as DBV increases, so that the number of EM pulses transitions from the first pulse number to the second pulse number, thereby realizing the transition between the PWM dimming interval and the DC dimming interval.

[0053] Based on the above technical solution, by setting the transition interval, the number of EM pulses can be gradually transitioned, thereby reducing the dimming difference and improving the flickering problem of the switching inflection point.

[0054] It should be noted that the duty cycle and pulse width of EM in this application refer to the duty cycle of the effective level and the pulse width of the effective level. As an example, when the low level of EM is an effective level and can drive the light-emitting unit to emit light, the duty cycle of the EM refers to the duty cycle of the low level. Similarly, when the high level of EM is an effective level, the duty cycle of the EM refers to the duty cycle of the high level.

[0055] In the above embodiments, the use of PWM dimming, EM pulse dimming and DC dimming within the DBV value range can be referred to as a dimming configuration. For example, the display device can have multiple different dimming configurations, and in different dimming configurations, the adjustment schemes of any one or more of PWM dimming, EM pulse dimming and DC dimming are different. For example, in different dimming configurations, in PWM dimming, the corresponding relationship between DBV and the number of EM pulses is different.

[0056] The following is an example with specific numerical values ​​for illustration. For the convenience of description, the example is referred to as display device #A.

[0057] It should be understood that the specific numerical values ​​in all the examples below are assumed for the convenience of description and do not constitute any limitation to the present application.

[0058] For example, the display device #A may have three dimming configurations, and the three dimming configurations may correspond to three different gamma curves GAMMA. Optionally, in some embodiments, the display device #A may have three refresh rates (e.g., 60 Hz, 90 Hz, and 120 Hz), and under the three refresh rates, three groups of GAMMA may be set correspondingly, and thus three dimming configurations may be set correspondingly.

[0059] In the three dimming configurations, the number of EM pulses corresponding to PWM dimming may be different from each other or at least partially different. The number of EM pulses corresponding to DC dimming may also be different from each other or at least partially different. The difference between the number of EM pulses corresponding to PWM dimming and DC dimming of the three dimming configurations may be different from each other, that is, the number of pulses required for transition of EM pulse dimming of the three dimming configurations is different. For example, the PWM dimming and DC dimming methods in the dimming configurations corresponding to the three groups of GAMMA are shown in Table 1 below.

[0060] Table 1

[0061]

[0062] As can be seen from Table 1, there are three dimming configurations in display device #A, corresponding to GAMMA1, GAMMA2 and GAMMA3, and the EM pulse number change values ​​between DC dimming and PWM dimming under the three dimming configurations are different, namely 9, 31 and 33. That is, under the three dimming configurations, the EM pulse dimming completes the transition of 9 pulses, 31 pulses and 33 pulses respectively. Therefore, in the EM pulse dimming process under the three dimming configurations, GAMMA1 requires at least 9 DBVs to complete the transition, GAMMA2 requires at least 31 DBVs to complete the transition, and GAMMA3 requires at least 33 DBVs to complete the transition.

[0063] In some embodiments, under the three dimming configurations, the DBVs at both ends of the transition interval corresponding to the EM pulse dimming have the same value. This will result in multiple DBVs in GAMMA1 and GAMMA2 using the same number of EM pulses in the transition interval, as shown in Table 2 below.

[0064] Table 2

[0065]

[0066]

[0067] In the above Table 2, when DBV is 1186 or above, DC dimming can be used, and when DBV is 1152 or below, PWM dimming can be used. The transition intervals corresponding to the three groups of GAMMA are all between 1152 and 1186. In the transition interval corresponding to GAMMA3, the number of EM pulses changes synchronously with each change in DBV. In the transition intervals corresponding to GAMMA1 and GAMMA2, the number of EM pulses may or may not change with each change in DBV. In the embodiment of the present application, the lengths of the transition intervals of the three groups of GAMMA are aligned with each other, while the step sizes of the changes in the number of EM pulses are different.

[0068] In addition, as shown in Table 2, during the EM pulse dimming process, the increased EM pulse width meets the minimum value of the EM pulse width. For example, due to factors such as chip design, the minimum increase width of the EM pulse width can be, for example, 4H. Among them, 1H is a unit time, and the unit time is the opening time of a row of pixels in the display screen. In this way, the highest dimming accuracy under normal dimming conditions can be guaranteed.

[0069] As an example, Figure 3 A schematic diagram showing EM signal waveforms in three modes: DC dimming, EM pulse dimming, and PWM dimming. Figure 3 As shown in the figure, TE is a clock cycle signal of the EM signal. For example, TE can be a circuit clock control signal in the display device that is synchronized with the video frame or the image frame. For example, the number of EM pulses is the smallest during DC dimming, and the number of EM pulses is the largest during PWM dimming, and the EM pulse dimming performs a transition of the number of EM pulses between DC dimming and PWM dimming, and the pulse width of each increase of the EM pulse dimming can be 4H.

[0070] When the above display device has multiple sets of different dimming configurations, the EM pulse dimming solution may have a brightness inversion problem, that is, in the transition interval, as the DBV value increases, the brightness may decrease instead of increase within a certain range. This problem is more obvious in the DBV and brightness relationship curve of low grayscale.

[0071] refer to Figure 4 As shown, illustratively, Figure 4 The corresponding relationship curve between DBV and brightness of display device #A with grayscale of 32 is described. The horizontal axis is the DBV value and the vertical axis is the brightness value. It can be seen that the corresponding relationship curve has a significant depression in the transition interval between PWM dimming and DC dimming in the box in the figure, which means that brightness inversion occurs in this section.

[0072] In view of the above problems, the embodiments of the present application provide a brightness adjustment method and a display device, which can solve the problem of dimming flicker at the switching inflection point when there are multiple dimming configurations in the display device, and will not cause brightness inversion and will not increase additional calibration costs, thereby better improving the brightness adjustment effect of the display screen. The following will be described in detail with reference to the accompanying drawings.

[0073] Figure 5 The present invention is a flowchart of a brightness adjustment method applicable to an embodiment of the present application.

[0074] refer to Figure 5 As shown, the brightness adjustment method 500 may include the following steps.

[0075] S510: Determine a target dimming configuration among multiple dimming configurations. The dimming configuration includes a corresponding relationship between an EM signal and a DBV in a transition interval, the transition interval is between a PWM dimming interval and a DC dimming interval, the multiple transition intervals corresponding to the multiple dimming configurations are not completely the same, and in each transition interval, the EM signal changes sequentially with the change of DBV.

[0076] In the embodiment of the present application, multiple dimming configurations are provided, each of which can be used to control a dimming process of a display screen. In the dimming configuration, a corresponding relationship between an EM signal and a DBV is set. During the dimming process, the EM signal corresponding to the DBV can be generated by obtaining the value of the DBV, thereby realizing the luminescence adjustment of the display screen.

[0077] In some embodiments, a corresponding relationship between the EM signal and the DBV in the transition interval is set in the dimming configuration. The DBV value range of the transition area is between the DBV value of the PWM dimming interval and the DBV value of the DC dimming interval. The transition interval can realize the transition between PWM dimming and DC dimming.

[0078] In addition, in the embodiment of the present application, the multiple transition intervals corresponding to the multiple dimming configurations are not completely the same, that is, the DBV value ranges of the multiple transition intervals do not completely overlap.

[0079] As an example, refer to Figure 6As shown, there are three dimming configurations 601, 602 and 603 for the display screen. In the three dimming configurations, as the DBV value increases from small to large, they are PWM dimming interval, transition interval and DC dimming interval. Among them, the minimum endpoints of the transition intervals of the three dimming configurations 601, 602 and 603 are different, but the maximum endpoints are the same. The lengths of the transition intervals under different dimming configurations are different, the transition interval length of 601 is the shortest, and the transition interval length of 603 is the shortest and the longest. Therefore, the transition intervals of the three dimming configurations 601, 602 and 603 do not completely overlap.

[0080] In other embodiments, the minimum endpoints of the transition intervals of the three dimming configurations 601, 602, and 603 may be the same, but the maximum endpoints may be different. Alternatively, the minimum endpoints and the maximum endpoints of the transition intervals of the three dimming configurations 601, 602, and 603 may be different. These two methods can also achieve that the transition intervals of the three dimming configurations 601, 602, and 603 do not completely overlap.

[0081] For example, in each transition interval, the duty cycle of the EM signal sequentially changes with the change of DBV, which may include: a signal parameter of the EM signal sequentially changes with the change of DBV, and the signal parameter of the EM signal may include at least one of the following: pulse width, pulse number, etc.

[0082] As a possible implementation, when the signal parameter of the EM signal includes the number of pulses, the dimming mode of the transition interval can be an EM pulse dimming mode. In the improved EM pulse dimming process provided in the embodiment of the present application, the number of EM pulses can change at least one value each time the DBV changes a value. Through this implementation, the transition interval can more conveniently realize the transition between the number of EM pulses of PWM dimming and the number of EM pulses of DC dimming, thereby effectively realizing the transition between PWM dimming and DC dimming.

[0083] As another possible implementation, the pulse width of EM may change with each change of DBV. For example, when DBV increases by one value, the pulse width of EM decreases accordingly, so that the duty cycle of the effective level of EM increases.

[0084] The display screen of the embodiment of the present application can set a variety of dimming configurations according to usage requirements, for example, it can be the above Figure 6 During the dimming process, a target dimming configuration that best matches the user's needs or the electronic device can be determined among multiple dimming configurations based on the usage of the display screen and the electronic device it is in, or based on user needs.

[0085] S520: Adjust the display brightness of the display screen according to the target dimming configuration.

[0086] For example, in some embodiments, the target brightness of the display screen that needs to be adjusted can be obtained according to the user input and / or the current operation of the electronic device where the display screen is located, thereby obtaining the DBV value corresponding to the target brightness, and then adjusting the display brightness of the display screen according to the DBV value and the target dimming configuration. In the application process, the control chip of the display screen can determine the DBV value by obtaining the display brightness value that can be set by the user in the device such as the smart phone, TV or computer where the display screen is located. The user can set the display brightness value of the electronic device through methods such as mouse, touch, physical button, voice, etc., thereby changing the DBV value.

[0087] Through the technical solution provided by the embodiment of the present application, the transition intervals under different dimming configurations are not aligned, and EM changes sequentially with the change of DBV. This can avoid the situation where the EM signal of multiple consecutive DBVs remains unchanged. In this case, it is avoided that as DBV increases but the EM duty cycle remains unchanged, the two dimming modes are out of sync and the brightness reversal problem occurs. By controlling the EM signal to keep changing with DBV, the dimming effect in the transition interval can be effectively controlled, which can not only solve the dimming flicker problem at the inflection point between PWM dimming and DC dimming, but also will not produce brightness reversal in the transition interval, thereby better improving the brightness adjustment effect of the display screen.

[0088] As described above, in the transition interval of the dimming configuration, every time DBV changes by one value, the number of pulses of EM may change by at least one value.

[0089] As a possible implementation, in the transition intervals of different dimming configurations, each time the DBV changes by one value, the number of EM pulses may change by the same value. As an example, in the transition interval of each dimming configuration, the DBV increases by 1, and the number of EM pulses decreases by 1. For example, in GAMMA1, when the DBV is 1177, the number of EM pulses is 12; when the DBV is 1178, the number of EM pulses is 11; and so on, until the DBV is 1186, the number of EM pulses is 3; in GAMMA2, when the DBV is 1167, the number of EM pulses is 22; when the DBV is 1168, the number of EM pulses is 21; and so on, until the DBV is 1186, the number of EM pulses is 3.

[0090] As another possible implementation, in the transition interval of different dimming configurations, the number of EM pulses may change to different values ​​each time the DBV changes by one value. As an example, in the dimming configuration corresponding to GAMMA1, the DBV increases by 1, and the number of EM pulses also decreases by 1. In the dimming configuration corresponding to GAMMA2, the DBV increases by 1, and the number of EM pulses also decreases by 2. For example, in GAMMA1, when the DBV is 1177, the number of EM pulses is 12; when the DBV is 1178, the number of EM pulses is 11; and so on, until the DBV is 1186, the number of EM pulses is 3; in GAMMA2, when the DBV is 1176, the number of EM pulses is 23; when the DBV is 1177, the number of EM pulses is 21; and so on, until the DBV is 1186, the number of EM pulses is 3.

[0091] As an example, in the transition interval of each dimming configuration, the change value of the pulse number of EM corresponding to two adjacent DBVs is 1.

[0092] In this case, considering that changing the number of EM pulses too quickly may also lead to insufficient transition and thus flicker problems, adding one pulse each time from the DC dimming interval to the PWM dimming interval can achieve a better transition effect and reduce the possibility of abnormal problems such as brightness reversal in the dimming interval.

[0093] In order to improve the dimming effect in the transition interval, in addition to adjusting the number of EM pulses in accordance with the change of DBV as described above, the pulse width of the newly added pulse or deleted pulse in EM can also be adjusted. In the following, the newly added pulse or deleted pulse is also referred to as the changed pulse in EM.

[0094] Optionally, in the transition interval, the width of the pulse changed in EM is greater than 4H, and the 4H is limited by factors such as chip design and is the minimum pulse width that can be adjusted by the chip. In addition, the width of the pulse changed in EM can be less than or equal to 16H. Among them, 1H can be the opening time of a row of pixels in the display screen.

[0095] In Table 2 and Figure 3 In the example shown, as DBV decreases, the width of the increased EM pulse is 4H. The 4H EM pulse width may not match the characteristics of the light-emitting device (such as a TFT tube) in the display device. For example, an excessively short pulse width causes the charging and discharging time of the TFT tube to be too short, and it cannot be fully opened or closed, thereby exacerbating the brightness reversal.

[0096] Therefore, the technical solution of the embodiment of the present application adjusts the width of the pulse that changes in EM, that is, the pulse width is greater than 4H, so that it can fully match the characteristics of the light-emitting device in the display device and reduce the possibility of problems such as brightness inversion. Furthermore, the pulse width is designed to be less than or equal to 16H, which can ensure the accuracy of dimming and optimize the dimming effect.

[0097] In some examples, the width of the pulse varying in the above EM may be equal to 8H.

[0098] refer to Figure 7 As shown in the figure, TE is the clock period signal of the EM signal. For example, TE can be a circuit clock control signal in the display device that is synchronized with the video frame or image frame. In the transition interval, EM pulse dimming is used, and the pulse width increases by 8H each time as DBV changes, which is greater than Figure 3 The pulse width shown is 4H.

[0099] Based on the above technical solution, the 8H EM pulse width better matches the characteristics of the light-emitting device (such as a TFT tube) in the display device, which can ensure that the light-emitting device is fully turned on and off, thereby ensuring that the EM pulse signal matches the display characteristics of the display screen in the display device, further improving brightness reversal.

[0100] Optionally, in the transition interval, in addition to adjusting the pulse number of the EM and / or the pulse width of the changing pulse, the overall duty cycle of the EM signal within the signal period can also be adjusted to achieve the transition from DC dimming to PWM dimming. As an example, in the transition interval, as the DBV changes, in addition to adjusting the width of the changing pulse of the EM, the pulse width of the original EM can also be adjusted to achieve the adjustment of the overall EM duty cycle.

[0101] Optionally, in the transition interval, the light emitting data signal (data) may be adjusted to achieve the transition from DC dimming to PWM dimming. As an example, as DBV increases, the voltage or current of data may be increased to achieve dimming of the display screen.

[0102] In some embodiments of the present application, in addition to the correspondence between EM and DBV in the transition interval described above, the dimming configuration may further include: the correspondence between EM and DBV in the DC dimming interval and the correspondence between EM and DBV in the PWM dimming interval.

[0103] Optionally, in the DC dimming interval, the pulse number of the EM corresponding to the DBV is a first pulse number, and in the PWM dimming interval, the pulse number of the EM corresponding to the DBV is a second pulse number, the first pulse number is less than the second pulse number, and the difference between the second pulse number and the first pulse number is greater than 1. For example, the first pulse number is 3 and the second pulse number is 12; or, the first pulse number is 1 and the second pulse number is 32; or, the first pulse number is 3 and the second pulse number is 36, etc. In the transition interval, the pulse number of the EM corresponding to the DBV changes between the first pulse number and the second pulse number.

[0104] For example, when transitioning from a DC dimming interval to a PWM dimming interval, the number of EM pulses gradually changes from a first number of pulses to a second number of pulses. Optionally, the change value of the number of EM pulses of two adjacent DBVs is 1. At this time, the width of the transition interval is equal to the difference between the first number of pulses and the second number of pulses.

[0105] In some embodiments of the present application, multiple dimming configurations may correspond to multiple groups of GAMMA. Optionally, multiple groups of GAMMA may correspond to different refresh rates of a display screen. In some application scenarios, a target dimming configuration may be selected from multiple dimming configurations according to the refresh rate and / or GAMMA requirements of the display screen.

[0106] For example, the target dimming configuration can be determined according to the actual needs of the electronic device to which the display screen belongs, and thereby instruct the control chip to select a suitable target dimming configuration. For example, if the electronic device needs to work in a power saving mode, which requires low power consumption but not a high refresh rate, a low refresh rate GAMMA can be selected at this time to determine the corresponding target dimming configuration.

[0107] The technical solution of the embodiment of the present application is further explained below with reference to a specific example. Taking display device #B as an example, the display device #B has three groups of dimming configurations, corresponding to three groups of GAMMA. Among them, the PWM dimming and DC dimming methods in the dimming configurations corresponding to the three groups of GAMMA of display device #B can be consistent with those of the above display device #A, as shown in Table 1 and the foregoing text, and will not be repeated here. However, in the technical solution provided in the embodiment of the present application, the dimming scheme of display device #B in the transition interval is different from that of display device #A, for example, as shown in Table 3 below.

[0108] Table 3

[0109]

[0110]

[0111] It should be understood that the above table is only an example for ease of understanding and does not constitute a limitation of the present application.

[0112] In the above Table 3, for the three groups of GAMMA, DC dimming can be used when DBV is 1186 or above, and PWM dimming can be used when DBV is 1177, 1155, and 1153 or below. The transition interval corresponding to GAMMA1 is between 1177 and 1186, the transition interval corresponding to GAMMA2 is between 1155 and 1186, and the transition interval corresponding to GAMMA3 is between 1153 and 1186. From the first to fourth columns of Table 3, it can be seen that for each group of GAMMA, within the transition interval, it is ensured that the number of EM pulses changes synchronously with each change in DBV.

[0113] Example 1: From the first and second columns of Table 3, we can see that when the DBV under GAMMA1 gradually decreases from 1186 to 1177, the number of EM pulses increases by 1 each time from 3 until it increases to 12, at which point the transition interval ends and the width of the transition interval is 9.

[0114] Example 2: From the first and third columns of Table 3, we can see that when the DBV under GAMMA2 gradually decreases from 1186 to 1155, the number of EM pulses increases by 1 each time from 1 until it increases to 32, at which point the transition interval ends and the width of the transition interval is 31.

[0115] Example 3. From the first and fourth columns of Table 3, we can see that when the DBV under GAMMA3 gradually decreases from 1186 to 1153, the number of EM pulses increases by 1 each time from 3 until it increases to 36. At this time, the transition interval ends and the width of the transition interval is 33.

[0116] For example, the first end values ​​of the three transition intervals corresponding to GAMMA1 to GAMMA3 are not completely the same, but the second end values ​​are the same, the first end value is close to the PWM dimming area, and the second end value is close to the DC dimming area.

[0117] As a further example, the second end values ​​of the plurality of transition intervals are all minimum DBV values ​​applicable to DC dimming.

[0118] It should be noted that the minimum DBV value applicable to DC dimming may be the minimum DBV value that can ensure the display effect of the display device when using DC dimming. Specifically, the minimum DBV value applicable to DC dimming may be limited by the process and technology of the display screen. In the case of medium and high brightness, all light-emitting points of the display screen can maintain consistent brightness under the same voltage and current, while too low brightness will cause problems such as uneven brightness and color due to process limitations.

[0119] Specifically, it can be seen from the first to fourth columns of Table 3 that in the above examples, the upper endpoints of the transition intervals under different GAMMAs are all points where the DBV is equal to 1186, and 1186 is the minimum DBV value applicable to DC dimming in this example.

[0120] Based on the above technical solution, by setting the upper endpoints of the transition interval at the available boundary of DC dimming, the coverage range of the DC dimming method is guaranteed as much as possible, and the flickering frequency of DC dimming is lower than that of PWM, so that the eye protection effect of the display device is better.

[0121] Still taking the above-mentioned display device #B as an example, it can be seen from the fifth column of Table 3 that in the above example, in the transition interval (DBV value is greater than or equal to 1153 and less than or equal to 1186), the width of the pulse of the EM signal each time it increases is 8H, and outside the transition interval (DBV value is less than or equal to 1152, or greater than or equal to 1187), the width of the pulse of the EM signal each time it increases is 4H.

[0122] refer to Figure 8 As shown, illustratively, Figure 8 The corresponding relationship curve between DBV and brightness of display device #B with grayscale of 32 is shown. The horizontal axis is the DBV value and the vertical axis is the brightness value. Figure 4 and Figure 8 It can be seen that after applying the technical solution proposed in the embodiment of the present application, the depression of the corresponding relationship curve disappears, which means that the brightness inversion problem no longer occurs in the transition interval.

[0123] The embodiment of the present application also provides a readable storage medium having a program code. When the computer program code runs on a computer, the computer executes the method in the above embodiment.

[0124] An embodiment of the present application also provides a chip product, where the product chip includes a circuit, and the circuit is used to execute the method in the above embodiment.

[0125] The embodiment of the present application further provides a display device, which includes a display screen and a control device. The control device is used to send a control signal to the display screen to execute the brightness adjustment method in any of the above embodiments.

[0126] Optionally, the control device may be, for example, a control chip. The relevant functions of the display screen and the control chip may be referred to above. Figure 1 Relevant description of the display screen 101 and the control chip 102 in the illustrated embodiment.

[0127] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0128] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0129] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0130] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0131] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0132] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0133] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for adjusting the brightness of a display screen, characterized in that: include: Determine a target dimming configuration from a plurality of dimming configurations, the dimming configurations comprising a corresponding relationship between a light-emitting enable signal EM and a display brightness value DBV in a transition interval, the transition interval being between a PWM dimming interval and a DC dimming interval, the plurality of transition intervals corresponding to the plurality of dimming configurations being not completely the same, and in each of the transition intervals, the duty cycle of the EM changes sequentially with the change of the DBV; The display brightness of the display screen is adjusted according to the target dimming configuration.

2. The brightness adjustment method according to claim 1, characterized in that: The first end values ​​of the plurality of transition intervals are not completely the same but the second end values ​​are the same, the first end value is close to the PWM dimming area, and the second end value is close to the DC dimming interval.

3. The brightness adjustment method according to claim 1, characterized in that: In each of the transition intervals, the pulse number of the EM changes sequentially with the change of the DBV.

4. The brightness adjustment method according to claim 3, characterized in that: The change value of the pulse number of the EM corresponding to two adjacent DBVs is 1.

5. The brightness adjustment method according to claim 3, characterized in that: The width of the pulse changing in the EM is greater than 4 unit times and less than or equal to 16 unit times, wherein 1 unit time is the opening time of a row of pixels in the display screen.

6. The brightness adjustment method according to claim 5, characterized in that: The width of the pulse changing in the EM is 8 time units.

7. The brightness adjustment method according to any one of claims 1 to 6, characterized in that: The dimming configuration further includes: a corresponding relationship between the EM and the DBV in the DC dimming interval and a corresponding relationship between the EM and the DBV in the PWM dimming interval.

8. The brightness adjustment method according to claim 7, characterized in that: In the DC dimming interval, the pulse number of the EM corresponding to the DBV is a first pulse number, and in the PWM dimming interval, the pulse number of the EM corresponding to the DBV is a second pulse number, the first pulse number is less than the second pulse number, and the difference between the second pulse number and the first pulse number is greater than 1; In the transition interval, as the DBV decreases sequentially, the pulse number of the EM corresponding to the DBV changes between the first pulse number and the second pulse number.

9. The brightness adjustment method according to claim 7, characterized in that: The dimming configuration further includes: a corresponding relationship between the light emitting data signal and the DBV in the transition interval.

10. The brightness adjustment method according to any one of claims 1 to 6, characterized in that: The plurality of dimming configurations correspond one-to-one to a plurality of gamma curves GAMMA.

11. A readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed, the brightness adjustment method according to any one of claims 1 to 10 can be implemented.

12. A control device, characterized in that: include: A processor and a memory, wherein the processor is used to read instructions stored in the memory, and when the processor executes the instructions, the control device implements the brightness adjustment method as described in any one of claims 1 to 10.

13. A display device, characterized in that: include: Display screen; A control device, used for sending a control signal to the display screen to execute the brightness adjustment method as described in any one of claims 1 to 10.

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