Pixel driving circuit, driving method of display circuit, trimming method of pixel driving circuit and display device

Abstract

The embodiment of the invention provides a pixel driving circuit, a driving method of a display circuit, a trimming method of the pixel driving circuit and a display device. The pixel driving circuit comprises a digital-to-analog conversion module used for driving a pixel unit of the display circuit, and the digital-to-analog conversion module comprises a trimming module used for generating a driving current corresponding to a current gear based on a trimming parameter of the trimming module in different preset current gears, the trimming parameter is configured to correspond to the current gear of each pixel unit.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of display technology, and in particular, to a pixel driving circuit, a driving method of a display circuit, an adjustment method of a pixel driving circuit, and a display device. Background Art

[0002] In display technologies such as LED, pixel units usually emit light under the drive of pixel driving circuits, and the brightness of the light is determined by the light-emitting performance of the pixel unit itself and the digital-to-analog conversion circuit (DAC) of the pixel driving circuit. When color is realized through pixel units and digital-to-analog conversion circuits, taking RGB as an example, since the voltage-current curves corresponding to the three color components are different, a different digital-to-analog conversion circuit will be designed for each of the three color components such as RGB for control.

[0003] However, different color components use different digital-to-analog conversion circuits. When the voltage, temperature and process change, the difference in the digital-to-analog conversion circuit structure will cause the voltage-current curves of different color components to have different changing trends. The luminous performance of pixel units of different color components may be mismatched. When designing the scanning algorithm, it is also necessary to consider the difference between the changing trends of the voltage-current curves of different color components, which increases the difficulty of designing the scanning algorithm. Summary of the invention

[0004] The embodiments described herein provide a pixel driving circuit, a driving method of a display circuit, a method for adjusting a pixel driving circuit, and a display device.

[0005] According to a first aspect of the present disclosure, a pixel driving circuit is provided, the pixel driving circuit comprising a digital-to-analog conversion module for driving a pixel unit of a display circuit, the digital-to-analog conversion module comprising: a trimming module for generating a driving current of a corresponding current level among different pre-set current levels based on trimming parameters of the trimming module, the trimming parameters being configured to correspond to the current level of each pixel unit.

[0006] In some embodiments of the present disclosure, the trimming module includes: multiple branch circuits and each branch circuit is provided with a switch, each pixel unit corresponds to a branch circuit, and different branch circuits generate driving currents of different current levels when they are turned on. The trimming parameters are used to describe the closed or open state of each switch.

[0007] In some embodiments of the present disclosure, the current adjustment range formed by different current gears in the adjustment module covers the maximum operating current of each pixel unit of different color components in the display circuit.

[0008] In some embodiments of the present disclosure, the current adjustment step length between different current gears in the adjustment module is smaller than the minimum current step length of the operating current of each pixel unit of different color components in the display circuit.

[0009] According to a second aspect of the present disclosure, a driving method for a display circuit is provided, the driving method comprising: using a trimming module of a digital-to-analog conversion module to generate a driving current of a corresponding current level in different pre-set current levels based on trimming parameters of the trimming module, the trimming parameters being configured to correspond to the current levels of each pixel unit in the display circuit; and outputting the generated driving current to the corresponding pixel unit in the display circuit.

[0010] According to a third aspect of the present disclosure, a method for adjusting a pixel driving circuit is provided. The pixel driving circuit is as described in any one of the first aspects, and the method comprises: obtaining an expected brightness and a current lighting brightness of a pixel unit of any color component driven by a digital-to-analog conversion circuit of the pixel driving circuit; and adjusting an adjustment parameter to adjust a current level of a driving current generated by the digital-to-analog conversion circuit until the lighting brightness of the pixel unit of any color component under the adjusted driving current matches the expected brightness.

[0011] In some embodiments of the present disclosure, the above-mentioned adjustment parameters are adjusted to adjust the current level of the driving current generated by the digital-to-analog conversion circuit until the lighting brightness of the pixel unit of any color component under the adjusted driving current matches the expected brightness, including: when the current lighting brightness is less than the expected brightness, the adjustment parameters are adjusted to adjust the selected current level so that the lighting brightness of the pixel unit of any color component under the driving current after the current level is adjusted up matches the expected brightness.

[0012] According to a fourth aspect of the present disclosure, a display device is provided, comprising: a plurality of identical pixel driving circuits as described in any one of the first aspects.

[0013] In some embodiments of the present disclosure, the display device also includes: a display circuit, including a plurality of pixel units corresponding to different color components, the digital-to-analog conversion circuit of the pixel driving circuit is connected one-to-one with the pixel units, and the adjustment parameters of the adjustment module of each digital-to-analog conversion circuit are configured to correspond to the current level of the connected pixel unit.

[0014] In some embodiments of the present disclosure, the display device further includes: at least one gamma corrector, and the gamma corrector is connected one-to-one with the pixel units.

[0015] In various embodiments of the present disclosure, the same digital-to-analog conversion circuit in the pixel driving circuit can output driving currents of different current levels only through different configurations of adjustment parameters, so that driving currents corresponding to different pixel units can be selected for output. Compared with using different digital-to-analog conversion circuits, using the same digital-to-analog conversion circuit can ensure that when outputting driving currents for pixel units of different colors, the system mismatch between pixel units of different colors is reduced. When the voltage, temperature, process and other conditions of the pixel units with different color components change, the voltage and current curves have more consistent change trends, which is also convenient for the design of the scanning algorithm and the correction of the luminous brightness of the pixel unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein:

[0017] Figure 1A-1B is a schematic structural diagram of a pixel driving circuit provided according to various embodiments of the present disclosure;

[0018] Figure 2 is a schematic flow chart of a method for driving a display circuit according to various embodiments of the present disclosure;

[0019] Figure 3 is a schematic flow chart of a method for adjusting a pixel driving circuit according to various embodiments of the present disclosure;

[0020] Figure 4 A schematic diagram of the structure of a display device provided according to various embodiments of the present disclosure;

[0021] It should be noted that the elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as those commonly understood by those skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the specification and the relevant technology, and will not be interpreted in an idealized or overly formal form unless otherwise clearly defined herein. As used herein, statements that two or more parts are "connected" or "coupled" together should refer to these parts being directly combined together or combined through one or more intermediate components. In addition, terms such as "first" and "second" are only used to distinguish one component (or a part of a component) from another component (or another part of a component).

[0024] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", "top", "bottom", etc. may be used here to describe the spatial positional relationship between a device or element and other devices or elements as shown in the figure. For example, the terms "on...", "above...", "above...", "on the upper surface of...", "above", "positioned on..." or "positioned on top of..." etc. mean that a first element such as a first structure exists on a second element such as a second structure, wherein there may or may not be an intermediate element between the first element and the second element. The term "contact" means connecting a first element such as a first structure and a second element such as a second structure, and there may or may not be other elements at the interface of the two elements. It should be understood that spatially relative terms are intended to include different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures" afterwards. Thus, the exemplary term "above..." may include both "above..." and "below..." orientations. The device may be otherwise oriented, rotated 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

[0025] In existing micro-display technology, since different color components correspond to different voltage-current curves, a different digital-to-analog conversion circuit is designed for each color for control. However, different color components use different digital-to-analog conversion circuits. When the voltage, temperature and process change, the voltage-current curves of different color components will change differently, which will increase the difficulty of calibration and scanning algorithm design.

[0026] The embodiment of the present disclosure provides a pixel driving circuit 10. The structure of the pixel driving circuit 10 is as follows: Figure 1AAs shown, the pixel driving circuit 10 includes a digital-to-analog conversion module 101. The number of the digital-to-analog conversion modules 101 in the pixel driving circuit 10 can be one or more.

[0027] The digital-to-analog conversion module 101 is used to drive the pixel unit of the display circuit. For example, the digital-to-analog conversion circuit 101 can convert the digital signal into an analog signal of a driving current, and the driving current can drive each pixel unit in the display circuit to work to display brightness.

[0028] The digital-to-analog conversion module 101 includes a trimming module 102, which can store trimming parameters. The trimming parameters can be configured or trimmed according to the actual usage scenario after the circuit is manufactured. In the manufacture of chips, the trimming technology can adjust certain parameters of the chip by writing data to the inside of the chip externally after the chip is manufactured, and change the connection mode and working state of certain devices inside the chip to achieve the purpose of changing the performance or function of the chip.

[0029] In this embodiment, the digital-to-analog conversion circuit 101 can be pre-set with different current gears during manufacturing, and the adjustment parameters of the adjustment module can be used as parameters for selection among these different current gears. That is, after the digital-to-analog conversion circuit is manufactured, the adjustment parameters can be changed as needed in the adjustment module to achieve the selection of different current gears, and finally the drive current of different current gears can be generated. Specifically, for example, the pre-set different current gears can be I1, I2, I3...In, etc. The adjustment module 102 can select a current gear from different current gears such as I1, I2, I3...In based on the adjustment parameters to generate a drive current.

[0030] In this embodiment, the adjustment parameters can be pre-configured to correspond to the current gear of each pixel unit. In this embodiment, when the digital-to-analog conversion circuit 10 is used to drive a certain color pixel unit of the display circuit, the adjustment parameters can be pre-configured as parameter values ​​corresponding to the current gear of the color pixel unit through the adjustment technology. In this way, when the adjustment module generates a driving current based on the configured adjustment parameters, the current gear of the generated driving current corresponds to the color pixel unit, and the driving of the color pixel unit is realized. For example, the current gears I1, I2, and I3 correspond to different pixel units such as R (red), G (green), and B (blue). When the digital-to-analog conversion circuit 101 of the pixel driving circuit 10 drives the red pixel unit, the adjustment parameter is configured to select the parameter value K1 of the current gear I1, and the adjustment module can generate the driving current of the current gear I1 based on the adjustment parameter configured as K1. When the pixel unit driven by the digital-to-analog conversion circuit 10 is green, the adjustment parameter is configured as the parameter value K2 corresponding to the current level I2 of the green pixel unit, and the adjustment module can generate the driving current of the current level I2 based on the adjustment parameter configured as K2. It can be seen that the digital-to-analog conversion module can generate the driving current of different current levels corresponding to different pixel units by configuring the adjustment parameter to different values.

[0031] In the technical solution of the present embodiment, the same digital-to-analog conversion circuit only needs to adjust the different configurations of parameters to output driving currents of different current levels, so that driving currents corresponding to different pixel units can be selected for output. Compared with digital-to-analog conversion circuits with different physical structures or designs, the use of the same digital-to-analog conversion circuit can reduce the probability of system mismatch between pixel units of different color components when outputting driving currents to pixel units of different color components. When the voltage, temperature, process and other conditions of the pixel units of different color components change, the voltage and current curves of the pixel units have more consistent change trends, which is also convenient for the design of the scanning algorithm and the correction of the luminous brightness of the pixel units.

[0032] In some embodiments of the present disclosure, the pixel driving circuit 10 is as follows: Figure 1B Specifically, the adjustment module 102 in the digital-to-analog conversion module 101 may include: a plurality of branch circuits 103 and each branch circuit is provided with a switch 104, and different branch circuits 103 generate driving currents of different current levels when they are turned on, and the adjustment parameters are used to describe the closed or open state of each switch 104.

[0033] For example, the multiple branch circuits 103 of the adjustment module 102 in this embodiment may include: a branch circuit corresponding to the current level I1, a branch circuit corresponding to the current level I2, ..., a branch circuit corresponding to the current level I nCorresponding branch circuits. A switch 104 is configured on each branch circuit corresponding to each current gear. For example, when the current gear corresponding to the red pixel unit is I1, only the branch circuit corresponding to the current gear I1 needs to be turned on to generate the driving current required by the red pixel unit. For another example, when the current gear corresponding to the green pixel unit is I2, when the branch circuit corresponding to the current gear I2 is turned on, the driving current required by the green pixel unit can be generated.

[0034] In this embodiment, the adjustment parameter is used to configure the closed or open state of each switch 104. Optionally, the closed or open state of each switch can be represented by a binary number, for example, 1 represents closed and 0 represents open. When there are three branch circuits, the adjustment parameter can represent the closed or open state of all branch circuits by a 3-bit binary number B1B2B3. For example, when the adjustment parameter is configured to 100, it can be represented that the switch of the branch circuit corresponding to the current gear I1 is set to a closed state, and the switches of the branch circuits corresponding to other current gears such as I2 and I3 are set to an open state. At this time, the adjustment module realizes the conduction of the branch circuit corresponding to the current gear I1 based on the adjustment parameter, thereby generating a driving current corresponding to the gear, that is, generating a driving current of the current gear I1 corresponding to the red pixel unit. For another example, when the adjustment parameter is configured to 010, it can be represented that the switch of the branch circuit corresponding to the current gear I2 is set to a closed state, and the switches of the branch circuits corresponding to other current gears such as I1 and I3 are set to an open state. At this time, the adjustment module realizes the conduction of the branch circuit corresponding to the current level 12 based on the adjustment parameter, thereby generating a driving current corresponding to the level, that is, generating a driving current of the current level 12 corresponding to the green pixel unit.

[0035] In the technical solution of this embodiment, the adjustment module can realize the selection function of different current gears and generate driving current by setting branch circuits and using adjustment parameters to configure the closed or open state of the switches of each branch circuit, so that the same digital-to-analog conversion can generate driving currents of different current gears to adapt to pixel units of different colors by only setting different adjustment parameters. In this way, the performance and change trends of the current and voltage of pixel units of different colors have better matching under the drive of the same digital-to-analog conversion circuit.

[0036] In some embodiments of the present disclosure, the current adjustment range formed by different current gears in the adjustment module 102 covers the maximum operating current of each pixel unit of different color components in the display circuit.

[0037] In this embodiment, the different current gears in the trimming module 102 can form a current trimming range. Since these different current gears are set when the circuit is manufactured, when the selected current gear is trimmed based on the trimming parameters in the later stage, only the current trimming range formed by these different current gears can be selected or configured. For the display circuit, the operating current of the pixel units of each color component is usually different, and there are different operating current ranges. For example, the operating current of the pixel unit corresponding to red is I R , the working current of the pixel unit corresponding to green is I G , the working current of the pixel unit corresponding to blue is I B In this embodiment, the current adjustment range covers the maximum operating current of each pixel unit of different color components. For example, the current adjustment range covers the above I R ,I G , IB. The operating current required by the pixel unit of each color component can be configured by adjusting the parameters, and there will be no situation where the operating current corresponding to a certain color component exceeds the adjustment range and cannot be configured.

[0038] In the technical solution of this embodiment, the current adjustment range covers the maximum operating current of each pixel unit of different color components, and all operating currents of the pixel units of all color components can be achieved by adjusting the current gear within the adjustment range, thereby improving the adaptability of the digital-to-analog conversion module to pixel units of different color components.

[0039] In some embodiments of the present disclosure, the current adjustment step length between different current gears in the adjustment module is smaller than the minimum current step length of the operating current of each pixel unit of different color components in the display circuit.

[0040] In this embodiment, when the adjustment module adjusts the parameters of the current gear, it can adjust according to the preset current adjustment step i1, and the current adjustment step i1 is the minimum current change unit when the current gear is changed. When adjusting the current gear, at least one current step i1 is adjusted each time. For example, start adjusting from I0, and adjust according to different current gears such as I0, I0+i1, I0+2*i1,..., I0+n*i1. At the same time, when the working current of the pixel unit of each color component changes, there is also a minimum current change unit. For example, the current step of the working current of the red pixel unit is iR, and the control current step of the green pixel unit is i G, the control current step of the blue pixel unit is iB. In this embodiment, the current adjustment step of each current gear by the adjustment module is smaller than the minimum current step of the working current of the pixel units of different color components of the display circuit. That is, i1 is smaller than the minimum value among iR, iR and iB. The step size reflects the change accuracy. Since the current adjustment step adjusted by the adjustment module is smaller than the minimum current step of the working current of the pixel units of each color component, that is, the control accuracy of the current gear adjusted by the adjustment module is greater than the change accuracy of the working current of any pixel unit itself, the generated drive current has a better adaptation accuracy with the corresponding pixel unit.

[0041] The technical solution of this embodiment, in which the current adjustment step is smaller than the minimum current step of the pixel units of different color components, can make the driving current output by changing the current gear through the adjustment module more accurately match the working current required by each pixel unit, thereby achieving better overall adaptation accuracy.

[0042] In some embodiments of the present disclosure, the pixel driving circuit further includes: an input module for receiving digital signals corresponding to different color components; and an output module for outputting the generated driving current to the pixel unit corresponding to the display circuit. In this embodiment, since the processing process of the input module and the output module for different color components is shared, the physical performance difference when driving the pixel units of different color components caused by the difference in this part of the structure is reduced.

[0043] Figure 2 FIG. 2 is a schematic flow chart showing a driving method 20 of a display circuit according to an embodiment of the present disclosure. The driving method may be Figure 1A , 1B The pixel driving circuit in any one of the embodiments is implemented.

[0044] The driving method 20 includes:

[0045] In step 201, a trimming module of a digital-to-analog conversion module is used to generate a driving current of a corresponding current level in different preset current levels based on trimming parameters of the trimming module, wherein the trimming parameters are configured to correspond to the current levels of each pixel unit in a display circuit.

[0046] In this embodiment, the trimming module of the digital-to-analog conversion module may be used to generate a driving current of a corresponding current level in different preset current levels based on the trimming parameters of the trimming module.

[0047] The adjustment parameters are pre-configured to correspond to the current levels of each pixel unit in the display circuit. At this time, the adjustment module of the digital-to-analog conversion circuit can be used to make the current level of the generated driving current correspond to each pixel unit, thereby achieving the adaptation of the driving current and the pixel unit.

[0048] In step 202, the generated driving current is output to the corresponding pixel unit in the display circuit.

[0049] In this embodiment, after the driving current required by the pixel unit is generated by the adjustment module of the digital-to-analog conversion circuit, the generated driving current can be output to the corresponding pixel unit. Since the generated driving current is compatible with the pixel unit, the driving current can realize the driving of the pixel unit.

[0050] In the technical solution of this embodiment, the same digital-to-analog conversion circuit only needs to adjust the parameters differently through the adjustment module to output drive currents of different current levels, and drive currents of different current levels can be adapted to different pixel units, thereby achieving the drive of different pixel units. Compared with using different digital-to-analog conversion circuits, using the same digital-to-analog conversion circuit can ensure that when outputting drive currents for pixel units of different color components, the system mismatch between pixel units of different color components is reduced, and the voltage and current curves of pixel units of different color components change in voltage, temperature, process and other conditions. The trend of change is more consistent, which is convenient for the design of scanning algorithms and the correction of the luminous brightness of pixel units.

[0051] Figure 3 FIG. 3 is a schematic flow chart of a method 30 for adjusting a pixel driving circuit according to an embodiment of the present disclosure. Figure 1A and Figure 1B The adjustment method 30 includes:

[0052] Step 301 : acquiring the expected brightness and current lighting brightness of a pixel unit of any color component driven by a digital-to-analog conversion circuit of a pixel driving circuit.

[0053] In this embodiment, the digital-to-analog conversion circuit is adjusted so that the pixel unit of any color component driven by the digital-to-analog conversion circuit can be displayed according to the expected brightness. For example, when the digital-to-analog conversion circuit drives the red pixel unit, it is necessary to adjust the red pixel unit so that it finally matches the required expected brightness.

[0054] At this time, the expected brightness and current lighting brightness of the pixel unit driven by the digital-to-analog conversion circuit can be first obtained to determine how to adjust and whether the lighting brightness of the pixel unit of the color component during the adjustment process matches the expected brightness.

[0055] Step 302 , adjusting the adjustment parameters to adjust the current level of the driving current generated by the digital-to-analog conversion circuit until the lighting brightness of the pixel unit of any color component under the adjusted driving current matches the expected brightness.

[0056] In this embodiment, the trimming process may be used to trim the trimming parameters in the trimming parameters. During the trimming process, the trimming parameters change, and correspondingly, the current level of the driving current generated by the trimming module also changes.

[0057] During the adjustment process of the adjustment parameters, the changes in the current lighting brightness of the pixel unit under the corresponding driving current can be monitored in real time. If the lighting brightness does not match the expected brightness, further adjustment is required; when the lighting brightness matches the expected brightness, the adjustment of the adjustment parameters is ended. By adjusting the digital-to-analog conversion circuit, the final luminous brightness of the pixel unit can be corrected to achieve the expected effect. Optionally, whether the lighting brightness matches the expected brightness can be judged by whether the difference between the two is less than a threshold. When the difference between the two is less than the threshold, it can be determined that the two match, otherwise it is considered that the two do not match and further adjustment is required.

[0058] In the technical solution of the present embodiment, in addition to being able to output different driving currents to drive pixel units of different colors through a trimming process, the same digital-to-analog conversion circuit can also further adjust the driving current through the trimming process so that the lighting brightness of the pixel unit of each color component reaches the expected brightness. Since the brightness adjustment of the pixel units of different color components is achieved through the same digital-to-analog conversion circuit, the system mismatch between the pixel units of different color components can also be further reduced, making the correction of the lighting brightness of the pixel units more convenient.

[0059] In some embodiments of the present disclosure, step 302 may include: when the current lighting brightness is less than the expected brightness, adjusting the adjustment parameters to adjust the selected current level so that the lighting brightness of the pixel unit of any color component under the driving current after the current level is adjusted up matches the expected brightness.

[0060] In this embodiment, when the current lighting brightness is less than the expected brightness, it is usually because the luminous performance of the pixel unit has declined, so that the lighting brightness of the pixel unit under the current driving current is weak. At this time, the decline in the luminous performance of the pixel unit can be offset by increasing the current gear of the driving current. In the process of increasing the current gear by adjusting the parameters, when the display brightness of the pixel unit with declining luminous performance matches the expected brightness under the enhanced driving current, it can be considered that the adjustment is completed.

[0061] In this embodiment, the technical solution of this embodiment can be applied to compensate for the brightness when the light-emitting performance of the pixel unit declines by adjusting the digital-to-analog conversion circuit. The current gear can be adjusted upward by adjusting the adjustment parameters, so that the driving current is adjusted upward to compensate for the light-emitting performance decline of the pixel unit, so that the pixel unit reaches the expected brightness.

[0062] The present disclosure also provides a Figure 4 The display device 40 shown in FIG. 4 comprises: a plurality of identical Figure 1A or Figure 1B The pixel driving circuit 401 described in any corresponding embodiment. The display device can be applied to any product with a display function, such as electronic paper, mobile phones, tablet computers, televisions, notebook computers, digital photo frames, wearable devices or navigators.

[0063] In some embodiments of the present disclosure, the display device 40 is as follows: Figure 4 As shown, a display circuit 402 may also be included, the display circuit 402 includes a plurality of pixel units 4021 corresponding to different color components, the digital-to-analog conversion circuits 4011 in the pixel driving circuit 401 are connected one by one with the pixel units 4021, and the adjustment parameters of each digital-to-analog conversion circuit 4011 are configured to correspond to the current level of the connected pixel unit 4021. In this way, the digital-to-analog conversion circuit 4011 can output a matching driving current to the connected pixel unit.

[0064] In some embodiments of the present disclosure, the display device 40 further includes: at least one gamma corrector 403, which is connected to each pixel unit one by one. In this embodiment, the gamma corrector 403 is used to adjust the voltage intensity applied to each pixel unit in the display circuit. In this embodiment, in addition to using the adjustment module of the digital-to-analog conversion circuit to adjust the current gear, the gamma corrector can also be used to adjust the voltage intensity applied to each pixel unit in the display circuit, and the dual adjustment of the driving current and voltage can further achieve the ability to adjust the lighting brightness of the pixel unit.

[0065] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the device and method according to multiple embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a part of a module, a program segment or an instruction, and a part of the module, a program segment or an instruction includes one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of special hardware and computer instructions.

[0066] Unless the context clearly indicates otherwise, the singular form of the words used herein and in the appended claims includes the plural and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the words "comprise" and "include" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it is located after a group of terms, the "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0067] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present application can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for purposes of illustration only and are not intended to limit the scope of the present application.

[0068] Several embodiments of the present disclosure are described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the attached claims.

Claims

1. A pixel driving circuit, characterized in that: The pixel driving circuit includes a digital-to-analog conversion module for driving a pixel unit of a display circuit, and the digital-to-analog conversion module includes: The trimming module is used to generate a driving current of a corresponding current level among different preset current levels based on the trimming parameters of the trimming module, wherein the trimming parameters are configured to correspond to the current level of each pixel unit.

2. The pixel driving circuit according to claim 1, characterized in that: The adjustment module comprises: There are multiple branch circuits and each branch circuit is provided with a switch. Each pixel unit corresponds to a branch circuit. When different branch circuits are turned on, driving currents of different current levels are generated. The adjustment parameters are used to describe the closed or open state of each switch.

3. The pixel driving circuit according to claim 1, characterized in that: The current adjustment range formed by different current gears in the adjustment module covers the maximum operating current of each pixel unit of different color components in the display circuit.

4. The pixel driving circuit according to claim 1, characterized in that: The current adjustment step length between different current gears in the adjustment module is smaller than the minimum current step length of the working current of each pixel unit of different color components in the display circuit.

5. A method for driving a display circuit, characterized in that: The driving method comprises: Using the trimming module of the digital-to-analog conversion module, generating a driving current of a corresponding current gear in different preset current gears based on the trimming parameters of the trimming module, wherein the trimming parameters are configured to correspond to the current gears of each pixel unit in the display circuit; The generated driving current is output to the corresponding pixel unit in the display circuit.

6. A method for adjusting a pixel driving circuit, characterized in that: The pixel driving circuit is as claimed in any one of claims 1 to 4, and the adjustment method comprises: Acquire the expected brightness and current lighting brightness of a pixel unit of any color component driven by the digital-to-analog conversion circuit of the pixel driving circuit; The trimming parameters are trimmed to adjust the current level of the driving current generated by the digital-to-analog conversion circuit until the lighting brightness of the pixel unit of any color component under the adjusted driving current matches the expected brightness.

7. The adjustment method according to claim 6, characterized in that: The adjusting the adjustment parameter to adjust the current level of the driving current generated by the digital-to-analog conversion circuit until the lighting brightness of the pixel unit of any color component under the adjusted driving current matches the expected brightness, comprises: When the current lighting brightness is less than the expected brightness, the adjustment parameter is adjusted to adjust the selected current level so that the lighting brightness of the pixel unit of any color component under the driving current after the current level is adjusted up matches the expected brightness.

8. A display device, characterized in that: The display device comprises: A plurality of identical pixel driving circuits as claimed in any one of claims 1 to 4.

9. The display device according to claim 8, characterized in that: The display device further includes: The display circuit includes a plurality of pixel units corresponding to different color components. The digital-to-analog conversion circuit of the pixel driving circuit is connected one by one with the pixel units. The adjustment parameters of the adjustment module of each digital-to-analog conversion circuit are configured to correspond to the current level of the connected pixel unit.

10. The display device according to claim 9, characterized in that: The display device further includes: At least one gamma corrector is connected to each pixel unit one by one.

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