Brightness adjustment method of display screen and display device

Abstract

The application provides a brightness adjusting method of a display screen and a display device, and relates to the technical field of display. The brightness adjusting method comprises the following steps: determining a target dimming configuration in multiple dimming configurations. The dimming configuration comprises a corresponding relationship between an emission enabling signal EM and a display brightness value DBV in a transition interval. The transition interval is located between a PWM dimming interval and a DC dimming interval. The multiple transition intervals corresponding to the multiple dimming configurations are not completely same. In each transition interval, the duty cycle of the EM changes in sequence with the change of the DBV. The display brightness of the display screen is adjusted according to the target dimming configuration. According to the scheme, the brightness inversion can preferably improve the brightness adjusting effect of the display screen.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a method and device for adjusting the brightness of a display screen. Background Technology

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

[0003] When using a hybrid dimming method combining DC and PWM dimming, severe flickering occurs at the switching inflection points between different dimming modes, affecting the brightness adjustment performance of the display device. Therefore, providing a brightness adjustment method with superior performance is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This application provides a brightness adjustment method and a display device, which have a 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 multiple dimming configurations, the dimming configuration including a correspondence between an emission enable signal EM and a display brightness value (DBV) within a transition range, the transition range being located between a PWM dimming range and a DC dimming range, the multiple transition ranges corresponding to the multiple dimming configurations not being completely identical, and in each transition range, the EM changing sequentially with the duty cycle of the DBV; and adjusting the display brightness of the display screen according to the target dimming configuration.

[0006] The technical solution provided in this application does not align the transition intervals under different dimming configurations, and the EM signal changes sequentially with the duty cycle of the DBV. This avoids the situation where the EM signal remains unchanged for multiple consecutive DBVs. By controlling the duty cycle of the EM signal to change with the DBV, the possibility of brightness reversal caused by asynchrony between PWM dimming and DC dimming is reduced, thereby improving the dimming effect within the transition interval. The technical solution in this application not only solves the dimming flicker problem at the inflection point between PWM dimming and DC dimming, but also prevents brightness reversal within the transition interval, thus better improving the brightness adjustment effect of the display screen.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the first end values ​​of multiple 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 value of multiple transition intervals at the boundary where DC dimming is available, the coverage of DC dimming is guaranteed as much as possible. The flicker frequency of DC dimming is lower than that of PWM, thus making the display device more eye-friendly.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the number of pulses of the EM changes sequentially with the change of the DBV in each transition interval.

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

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

[0012] Based on the above technical solution, considering that too rapid an increase in the number of EM pulses may lead to insufficient transition and thus flickering, the method of adding one pulse each time from the DC dimming range to the PWM dimming range can ensure that the duty cycle of the EM signal does not remain unchanged, while also achieving a better transition effect.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the width of the changing pulse in the EM is greater than 4 unit time and less than or equal to 16 unit time, where 1 unit time is the on-time of a row of pixels in the display screen.

[0014] Based on the above technical solution, the width of the varying pulses in the EM was adjusted to be greater than 4H, enabling it to fully match the characteristics of the light-emitting devices in the display device and reducing the possibility of problems such as brightness reversal. Furthermore, a pulse width design of less than or equal to 16H ensures dimming accuracy and optimizes the dimming effect.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the width of the varying pulse in the EM is 8 units of time.

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

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the dimming configuration also includes the correspondence between EM and DBV in the DC dimming range and the correspondence between EM and DBV in the PWM dimming range.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, within the DC dimming range, the number of pulses of the EM corresponding to the DBV is the first pulse number, and within the PWM dimming range, the number of pulses of the EM corresponding to the DBV is the 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. Within the transition range, as the DBV decreases sequentially, the number of pulses of the EM corresponding to the DBV varies between the first pulse number and the second pulse number.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, the dimming configuration further includes: the correspondence between the emission data signal and the DBV within the transition range.

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

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

[0022] Thirdly, a control device is provided, comprising: a processor and a memory, the processor being configured to read instructions stored in the memory, and when the processor executes the instructions, causing the control device to implement the brightness adjustment method as described in any of the implementations of the first aspect above.

[0023] Fourthly, a display device is provided, comprising: a display screen; and a control device for sending a control signal to the display screen to perform a brightness adjustment method as described in any of the implementations of the first aspect above. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a display device to which this application applies.

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

[0026] Figure 3 This is a schematic diagram illustrating the variation of an EM signal pulse with DBV, provided in an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the correspondence curve between DBV and brightness provided in an embodiment of this application.

[0028] Figure 5 This is a schematic flowchart of a brightness adjustment method provided in an embodiment of this application.

[0029] Figure 6 This is a schematic diagram of a dimming interval distribution method under multiple dimming configurations provided in an embodiment of this application.

[0030] Figure 7 This is a schematic diagram illustrating the variation of an EM signal pulse with DBV, provided in an embodiment of this application.

[0031] Figure 8 This is a schematic diagram of the correspondence curve between DBV and brightness provided in an embodiment of this application. Detailed Implementation

[0032] The technical solutions of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0033] It should be noted that the terms "first," "second," "#A," "#B," etc., used in the specification, claims, and accompanying drawings of this invention are for descriptive convenience only, used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such objects can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] This application will present various aspects, embodiments, or features relating to a system comprising multiple devices, components, modules, etc. It should be understood and appreciated that individual systems may include additional devices, components, modules, etc., and / or may not include all the devices, components, modules, etc. discussed in conjunction with the accompanying drawings. Furthermore, combinations of these approaches are also possible.

[0035] Furthermore, in the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" in the embodiments of this application should not be construed as being better or more advantageous than other embodiments or design schemes. Specifically, the use of the term "exemplary" is intended to present the concept in a concrete manner.

[0036] The business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0037] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0038] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer 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 represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0039] This application relates to a display screen that can be applied to various fields and scenarios. As an example, the display screen can be applied to 3C electronic products in the fields of computers, communications, and consumer electronics, including but not limited to televisions, mobile phones, computers, laptops, tablets, personal digital assistants (PDAs), in-vehicle computers, wearable devices, gaming devices, shooting equipment, etc. This 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 this application can be a liquid crystal display (LCD), an OLED display, a quantum dot light-emitting diode (QLED) display, etc. This application does not limit the specific type of display screen.

[0041] Figure 1 A schematic diagram of the structure of a display device 100 to which this application applies is shown.

[0042] like Figure 1 As shown, the display device 100 includes a display screen 101 and a control chip 102, which are electrically connected. The display screen 101 has structures such as light-emitting units and pixel circuits and is controlled by control signals issued by the control chip to display images. 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 the instructions stored in the memory. The control chip 102 can issue various control signals, such as an EM enable signal to control whether the light-emitting units emit light, and a data signal (data) to control the brightness of the light-emitting units.

[0043] The display screen 101 includes multiple display brightness levels, each controllable by a depth-of-color (DBV). Changing the DBV alters the control signal sent from the control chip 102 to the display screen 101, thereby changing the current brightness level of the display device 100. For example, the DBV value can be represented by 12 bits of data, resulting in 4095 DBV levels, each corresponding to a different value within the brightness range. As an example, the brightness range could be from 100 nits to 500 nits, or other brightness ranges as required.

[0044] In practical use, the relationship between DBV and brightness value depends on the specific characteristics of the display device, including the display light-emitting material, display structure design, and driving circuit design. Furthermore, the brightness adjustment range of different display devices may vary, ranging from tens of nits to thousands of nits.

[0045] To facilitate understanding of the embodiments of this application, the relevant concepts of display screen dimming are introduced below.

[0046] The dimming methods for displays 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-emitting control circuit. For example, changing the voltage or current of the light-emitting data signal in the pixel circuit adjusts the amount of light emitted by the light-emitting unit. This adjustment method does not cause screen flicker, meaning the screen brightness is constant, causing less eye strain. However, at low brightness levels, it requires a higher level of control signal adjustment capability, making precise control difficult. Furthermore, due to the differences in luminous efficiency among the red, green, and blue light-emitting units, color distortion may occur. Therefore, PWM dimming is necessary.

[0048] PWM dimming adjusts brightness by controlling the on / off time of pixel light-emitting units. In this dimming method, the brightness of the pixel light-emitting units can remain constant, while the emission time varies. For example, in a pixel circuit, the on / off state of the light-emitting units can be controlled by an emission enable signal EM. In some implementations, the emission time of the light-emitting units can be adjusted by regulating the duty cycle of EM, thereby controlling the brightness. This method is efficient and stable, avoiding inaccurate color rendering and color distortion problems. However, this method may have flicker issues, which may cause imperceptible irritation to the human eye, especially at low-frequency PWM dimming, which may have adverse effects on vision.

[0049] Therefore, considering the limitations of DC dimming and PWM dimming, display devices, including OLED screens, often adjust display brightness through hybrid dimming. That is, DC dimming is used when high brightness (corresponding to high DBV value) is required to ensure eye protection, while PWM dimming is used when low brightness (corresponding to low DBV value) is required to ensure display quality.

[0050] In some implementations, the number of pulses in the EM signal per signal cycle (one frame image cycle) is set to be relatively small in the DC dimming range, such as 1 or 3 pulses, while the number of pulses in the PWM dimming range is set to be larger, such as 12 or 32 pulses. When adjusting the display brightness by sliding the DBV, a sudden change in the number of pulses occurs at the switching inflection point between the DC dimming range and the PWM dimming range, resulting in a visible screen flicker. Currently, terminal manufacturers are paying increasing attention to the eye protection function of display screens, and when dimming in the PWM dimming range, they may further increase the number of pulses in the EM signal, for example, to 36 pulses, making the flicker problem at the switching inflection point even more serious.

[0051] To address the aforementioned flickering problem, this application proposes a feasible solution, which will be discussed in conjunction with the appendix below. Figure 2 To illustrate.

[0052] like Figure 2 As shown, the entire DBV value range can be divided into three sections from low to high: PWM dimming range, transition range, and DC dimming range. In the PWM dimming range, PWM dimming is used, and the number of EM pulses remains constant. The duty cycle can be adjusted by changing the width of the EM pulses. In the DC dimming range, DC dimming is used, and the number of EM pulses also remains constant, but is less than that in the PWM dimming range. The transition range (also called the dimming interval) is the transition zone between the PWM and DC dimming ranges. EM pulse dimming can be used in this range. For example, the number of EM pulses in the PWM dimming range is the first pulse count, and the number of EM pulses in the DC dimming range is the second pulse count. In the transition range, the number of EM pulses can be gradually reduced as the DBV increases, allowing the number of EM pulses to transition from the first to the second pulse count, thus achieving the transition between the PWM and DC dimming ranges.

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

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

[0055] In the above embodiments, using 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, any one or more of the adjustment schemes among PWM dimming, EM pulse dimming, and DC dimming are different. For instance, in different dimming configurations, the correspondence between DBV and the number of EM pulses is different in PWM dimming.

[0056] The following example, using specific numerical values, will illustrate this point. For ease of description, this example will be referred to as display device #A.

[0057] It should be understood that the specific values ​​in all examples below are assumed for ease of explanation and do not constitute any limitation on this application.

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

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

[0060] Table 1

[0061]

[0062] As shown in Table 1, display device #A has three dimming configurations, corresponding to GAMMA1, GAMMA2, and GAMMA3, respectively. The EM pulse count variations differ between DC dimming and PWM dimming under these three configurations, being 9, 31, and 33 pulses respectively. This means that under the three dimming configurations, EM pulse dimming completes transitions of 9, 31, and 33 pulses, respectively. Therefore, during the EM pulse dimming process under the three dimming configurations, GAMMA1 requires at least 9 dBV to complete the transition, GAMMA2 requires at least 31 dBV, and GAMMA3 requires at least 33 dBV.

[0063] In some implementations, under these three dimming configurations, the DBV values ​​at both ends of the transition interval corresponding to EM pulse dimming are the same. This can lead to multiple instances where GAMMA1 and GAMMA2 within the transition interval use the same number of EM pulses for their DBV values. For example, as shown in Table 2 below.

[0064] Table 2

[0065]

[0066]

[0067] In Table 2 above, DC dimming can be used when DBV is 1186 or higher, and PWM dimming can be used when DBV is 1152 or lower. The transition range for all three GAMMA sets is between 1152 and 1186. In the transition range corresponding to GAMMA3, the EM pulse count changes synchronously with each change in DBV. However, in the transition ranges corresponding to GAMMA1 and GAMMA2, the EM pulse count may or may not change with each change in DBV. In this embodiment, the lengths of the transition ranges for the three GAMMA sets are aligned, but the step size for the change in EM pulse count is different for each set.

[0068] Furthermore, as shown in Table 2, during EM pulse dimming, the width of the increased EM pulse always meets the minimum value of the EM pulse width. For example, due to limitations such as chip design, the minimum increase width of this EM pulse can be, for example, 4H. Here, 1H represents one unit of time, which is the on-time of one row of pixels on the display screen. This method ensures the highest dimming accuracy under normal dimming conditions.

[0069] As an example, Figure 3 A schematic diagram of the EM signal waveforms under three dimming methods—DC dimming, EM pulse dimming, and PWM dimming—is shown. (Reference) Figure 3 As shown in the figure, TE is the 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 video frames or image frames. 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. EM pulse dimming transitions the number of EM pulses between DC dimming and PWM dimming, and the pulse width of each increase in EM pulse dimming can be 4H.

[0070] When the aforementioned display device has multiple different dimming configurations, the EM pulse dimming scheme may suffer from a brightness inversion problem. That is, within the transition range, the brightness may decrease instead of increase as the DBV value increases. This problem is particularly pronounced in the DBV-brightness relationship curve at low gray levels.

[0071] refer to Figure 4 As shown, exemplarily, Figure 4 The graph depicts the relationship between DBV and brightness for display device #A with a grayscale of 32. The horizontal axis represents the DBV value, and the vertical axis represents the brightness value. It can be seen that the curve shows a significant dip in the area within the box at the transition zone between PWM dimming and DC dimming, indicating a brightness reversal within this segment.

[0072] To address the aforementioned problems, this application provides a brightness adjustment method and display device. When multiple dimming configurations exist in the display device, this method not only solves the dimming flicker problem at the switching inflection point but also avoids brightness reversal and does not incur additional calibration costs, thus significantly improving the brightness adjustment effect of the display screen. A detailed description will follow with reference to the accompanying drawings.

[0073] Figure 5 This is a schematic flowchart of a brightness adjustment method applicable to embodiments of this 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. This dimming configuration includes the correspondence between the EM signal and DBV within a transition interval, which is located between the PWM dimming interval and the DC dimming interval. The multiple transition intervals corresponding to the multiple dimming configurations are not completely identical, and within each transition interval, the EM signal changes sequentially with the DBV.

[0076] In this embodiment, multiple dimming configurations are provided, each of which can be used to control a dimming process of the display screen. Each dimming configuration establishes a correspondence between an EM signal and a DBV (Dark Value). During dimming, the EM signal corresponding to the DBV can be generated by acquiring the DBV value, thereby adjusting the display screen's illumination.

[0077] In some implementations, the dimming configuration sets a correspondence between the EM signal and DBV in the transition range. The DBV value range of this transition range is between the DBV value of the PWM dimming range and the DBV value of the DC dimming range. The transition range can realize the transition between PWM dimming and DC dimming.

[0078] In addition, in the embodiments of this 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, see reference Figure 6As shown, the display screen has three dimming configurations: 601, 602, and 603. In these three configurations, the DBV values, from smallest to largest, represent the PWM dimming range, the transition range, and the DC dimming range, respectively. The minimum endpoints of the transition ranges for the three configurations 601, 602, and 603 are different, but the maximum endpoints are the same. The lengths of the transition ranges differ across the configurations, with 601 having the shortest and 603 having the longest. Therefore, the transition ranges 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, both the minimum and maximum endpoints of the transition intervals of the three dimming configurations 601, 602, and 603 may be different. These two methods also achieve a non-complete overlap of the transition intervals of the three dimming configurations 601, 602, and 603.

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

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

[0083] As another possible implementation, the pulse width of EM can change with each change in DBV. For example, when DBV increases by a value, the pulse width of EM decreases accordingly, thereby increasing the duty cycle of the effective level of EM.

[0084] The display screen in this embodiment can be configured with various dimming settings according to usage requirements, for example, it can be the one described above. Figure 6 The three dimming configurations are shown. During the dimming process, the target dimming configuration that best suits the user's needs or electronic equipment can be determined from among several dimming configurations, based on the usage of the display screen and its associated electronic equipment, or based on user needs.

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

[0086] For example, in some implementations, the target brightness that the display needs to be adjusted can be obtained based on user input and / or the current operating status of the electronic device where the display is located. This allows for the acquisition of the DBV value corresponding to the target brightness, and the display brightness can then be adjusted according to the DBV value and the target dimming configuration. In application, the display's control chip can determine the DBV value by acquiring the user-configurable display brightness value from the smartphone, television, or computer where the display is located. Users can set the display brightness value of the electronic device using methods such as a mouse, touch, physical buttons, or voice commands, thereby changing the DBV value.

[0087] The technical solution provided in this application does not align the transition intervals under different dimming configurations, and the EM changes sequentially with the DBV. This avoids the situation where the EM signal remains unchanged for multiple consecutive DBVs. It also avoids the problem of brightness reversal caused by the two dimming methods becoming asynchronous due to the unchanged EM duty cycle as the DBV increases. By controlling the EM signal to change with the DBV, the dimming effect within the transition interval can be effectively controlled. This not only solves the dimming flicker problem at the inflection point between PWM dimming and DC dimming, but also prevents brightness reversal within the transition interval, thereby significantly improving the brightness adjustment effect of the display screen.

[0088] As mentioned above, in the transition range of the dimming configuration, for every change in DBV value, the pulse count of EM can change by at least one value.

[0089] As one possible implementation, in the transition range of different dimming configurations, the number of EM pulses can change by the same value for each change in DBV. For example, in each dimming configuration transition range, if DBV increases by 1, the number of EM pulses decreases by 1. For instance, in GAMMA1, when DBV is 1177, the number of EM pulses is 12; when DBV is 1178, the number of EM pulses is 11; and so on, until DBV is 1186, at which point the number of EM pulses is 3. In GAMMA2, when DBV is 1167, the number of EM pulses is 22; when DBV is 1168, the number of EM pulses is 21; and so on, until DBV is 1186, at which point the number of EM pulses is 3.

[0090] As another possible implementation, in the transition range of different dimming configurations, the number of EM pulses can change by a different value for each change in DBV. For example, in the dimming configuration corresponding to GAMMA1, an increase of 1 in DBV results in a decrease of 1 in the number of EM pulses. In the dimming configuration corresponding to GAMMA2, an increase of 1 in DBV results in a decrease of 2 in the number of EM pulses. Specifically, in GAMMA1, when DBV is 1177, the number of EM pulses is 12; when DBV is 1178, the number of EM pulses is 11; and so on, until DBV is 1186, at which point the number of EM pulses is 3. In GAMMA2, when DBV is 1176, the number of EM pulses is 23; when DBV is 1177, the number of EM pulses is 21; and so on, until DBV is 1186, at which point the number of EM pulses is 3.

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

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

[0093] To improve the dimming effect in the transition range, in addition to adjusting the number of pulses in the EM according to the DBV as described above, the pulse width of newly added or removed pulses in the EM can also be adjusted. In the following text, these newly added or removed pulses will also be referred to as the pulses that change in the EM.

[0094] Optionally, during the transition interval, the width of the varying pulses in the EM is greater than 4H. This 4H is limited by factors such as chip design and is the minimum pulse width that the chip can adjust. Alternatively, the width of the varying pulses in the EM can be less than or equal to 16H. Here, 1H can represent the on-time of one row of pixels on the display screen.

[0095] Table 2 above and Figure 3 In the example shown, as DBV decreases, the width of the increased EM pulse is 4H. This 4H EM pulse width may not be well matched with the characteristics of the light-emitting device (e.g., TFT tube) in the display device. For example, the pulse width is too short, which causes the charging and discharging time of the TFT tube to be too short, making it unable to be fully turned on or off, thereby aggravating the brightness reversal.

[0096] Therefore, the technical solution of this application adjusts the width of the varying pulse in the EM, i.e., 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 reversal. Furthermore, the pulse width is designed to be less than or equal to 16H, which can ensure the dimming accuracy and optimize the dimming effect.

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

[0098] refer to Figure 7 As shown in the figure, TE is the clock cycle signal of the EM signal. For example, TE can be a circuit clock control signal in the display device that synchronizes with video frames or image frames. EM pulse dimming is used in the transition range, with the pulse width increasing by 8H each time with the DBV change, which is greater than... Figure 3 The pulse width shown is 4H.

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

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

[0101] Optionally, during the transition range, the luminous data signal (data) can be adjusted to achieve the transition between DC dimming and PWM dimming. As an example, as DBV increases, the voltage or current of data can be increased to achieve dimming of the display screen.

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

[0103] Optionally, within the DC dimming range, the pulse count of the EM corresponding to the DBV is the first pulse count, and within the PWM dimming range, the pulse count of the EM corresponding to the DBV is the second pulse count. The first pulse count is less than the second pulse count, and the difference between the second pulse count and the first pulse count is greater than 1. For example, the first pulse count is 3 and the second pulse count is 12; or, the first pulse count is 1 and the second pulse count is 32; or, the first pulse count is 3 and the second pulse count is 36, etc. Within the transition range, the pulse count of the EM corresponding to the DBV varies between the first pulse count and the second pulse count.

[0104] For example, when transitioning from DC dimming to PWM dimming, the EM pulse count gradually changes from the first pulse count to the second pulse count. Optionally, the change in the EM pulse count between two adjacent DBVs is 1. In this case, the width of the transition interval is equal to the difference between the first and second pulse counts.

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

[0106] For example, the target dimming configuration can be determined based on the actual needs of the electronic device to which the display belongs, and this will instruct the control chip to select a suitable target dimming configuration. For instance, if the electronic device needs to operate in a power-saving mode, requiring lower power consumption but not a high refresh rate, then a low refresh rate GAMMA can be selected to determine the corresponding target dimming configuration.

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

[0108] Table 3

[0109]

[0110]

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

[0112] In Table 3 above, for the three GAMMA groups, DC dimming can be used when the DBV is 1186 or higher, while PWM dimming can be used when the DBV is 1177, 1155, and 1153 or lower, respectively. The transition range for GAMMA1 is between 1177 and 1186, for GAMMA2 it is between 1155 and 1186, and for GAMMA3 it is between 1153 and 1186. As can be seen from the first to fourth columns of Table 3, for each GAMMA group, within the transition range, it is ensured that for every change in DBV, the EM pulse count changes synchronously by one value.

[0113] Example 1: As can be seen from the first and second columns of Table 3, during the process of DBV gradually decreasing from 1186 to 1177 under GAMMA1, the number of EM pulses increases by 1 each time starting from 3 until it increases to 12. At this point, the transition interval ends, and the width of the transition interval is 9.

[0114] Example 2: As can be seen from the first and third columns of Table 3, during the process of DBV gradually decreasing from 1186 to 1155 under GAMMA2, the number of EM pulses increases by 1 each time starting from 1 until it increases to 32. At this point, the transition interval ends, and the width of the transition interval is 31.

[0115] Example 3: As can be seen from the first and fourth columns of Table 3, during the process of DBV gradually decreasing from 1186 to 1153 under GAMMA3, the number of EM pulses increases by 1 each time starting from 3 until it reaches 36. At this point, the transition interval ends, and the width of the transition interval is 33.

[0116] For example, the first values ​​of the three transition intervals corresponding to GAMMA1 to GAMMA3 are not exactly the same, but the second values ​​are the same. The first value is closer to the PWM dimming zone, and the second value is closer to the DC dimming zone.

[0117] As a further example, the second end value of multiple transition intervals is the minimum DBV value applicable to DC dimming.

[0118] It should be noted that the minimum DBV value applicable to DC dimming is 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 display's manufacturing process and technology. Under medium to high brightness conditions, all light-emitting points of the display can maintain consistent brightness under the same voltage and current. However, excessively low brightness will result in problems such as uneven brightness and color due to manufacturing limitations.

[0119] Specifically, as can be seen from the first to fourth columns of Table 3, in the above examples, the upper endpoint of the transition interval under different GAMMA is a point where DBV equals 1186. 1186 is the minimum DBV value applicable to DC dimming in this example.

[0120] Based on the above technical solution, by setting the upper endpoint of the transition range at the boundary where DC dimming is available, the coverage of DC dimming is guaranteed as much as possible. The flicker frequency of DC dimming is lower than that of PWM, thus making the display device more eye-friendly.

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

[0122] refer to Figure 8 As shown, exemplarily, Figure 8 The curve showing the relationship between DBV and brightness for display device #B with a grayscale of 32 is presented. The horizontal axis represents the DBV value, and the vertical axis represents the brightness value. (Comparison) Figure 4 and Figure 8 As can be seen, after applying the technical solution proposed in the embodiments of this application, the concavity of the corresponding curve disappears, which means that the brightness reversal problem no longer occurs in the transition interval.

[0123] This application also provides a readable storage medium having program code that, when run on a computer, causes the computer to perform the methods described in the above embodiments.

[0124] This application also provides a chip product, which includes a circuit for performing the methods described in the above embodiments.

[0125] This application also 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] Alternatively, the control device may be, for example, a control chip. The functions of the display screen and the control chip are described above. Figure 1 Description of the display screen 101 and control chip 102 in the illustrated embodiment.

[0127] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

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

[0129] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

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

[0131] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0132] If the aforementioned functions are implemented as 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 this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0133] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for adjusting the brightness of a display screen, characterized in that, include: A target dimming configuration is determined among multiple dimming configurations. The dimming configuration includes the correspondence between the emission enable signal EM and the display brightness value DBV within a transition range. The transition range is located between the PWM dimming range and the DC dimming range. The transition range, the PWM dimming range, and the DC dimming range all belong to the value range of the DBV. The coverage of the multiple transition ranges corresponding to the multiple dimming configurations within the value range of the DBV is not completely the same. In each transition range, the duty cycle of the EM changes sequentially with the change of the DBV. Adjust the display brightness of the screen according to the target dimming configuration.

2. The brightness adjustment method according to claim 1, characterized in that, The first end values ​​of the multiple transition intervals are not exactly the same, but the second end values ​​are the same. The first end value is closer to the PWM dimming zone, and the second end value is closer to the DC dimming zone.

3. The brightness adjustment method according to claim 1, characterized in that, In each transition interval, the number of pulses 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 in the number of pulses 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 units of time and less than or equal to 16 units of time, where 1 unit of time is the on-time of a row of pixels on the display screen.

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

7. The brightness adjustment method according to any one of claims 1 to 6, characterized in that, The dimming configuration also includes: the correspondence between the EM and the DBV in the DC dimming range and the correspondence between the EM and the DBV in the PWM dimming range.

8. The brightness adjustment method according to claim 7, characterized in that, Within the DC dimming range, the number of pulses of the EM corresponding to the DBV is the first pulse number; within the PWM dimming range, the number of pulses of the EM corresponding to the DBV is the 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. Within the transition interval, as the DBV decreases sequentially, the number of pulses of the EM corresponding to the DBV varies between the first number of pulses and the second number of pulses.

9. The brightness adjustment method according to claim 7, characterized in that, The dimming configuration also includes: the correspondence between the light emission data signal and the DBV within the transition range.

10. The brightness adjustment method according to any one of claims 1 to 6, characterized in that, The multiple dimming configurations correspond one-to-one with multiple gamma curves (GAMMA).

11. A readable storage medium, characterized in that, The device contains a computer program that, when executed, implements the brightness adjustment method as described in any one of claims 1 to 10.

12. A control device, characterized in that, include: A processor and a memory, the processor being configured to read instructions stored in the memory, and when the processor executes the instructions, causing the control device to implement 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 is configured to send a control signal to the display screen to perform the brightness adjustment method as described in any one of claims 1 to 10.

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