Voltage control method and apparatus for pixel circuit, and storage medium and electronic device

Abstract

A voltage control method and apparatus for a pixel circuit, and a storage medium and an electronic device. The voltage control method for a pixel circuit comprises: receiving a display brightness instruction inputted into a display apparatus; and on the basis of a display brightness value indicated by the display brightness instruction, and a preset first correspondence between the display brightness value and a voltage value of a second driving voltage and voltage value of an initial voltage, determining a voltage value of the second driving voltage and a voltage value of the initial voltage at present, wherein the first correspondence comprises a second correspondence between display brightness values corresponding to at least two DBV nodes and the voltage value of the second driving voltage and voltage value of the initial voltage, and a third correspondence between a display brightness value corresponding to at least one DBV sub-node and the voltage value of the second driving voltage and voltage value of the initial voltage; the DBV sub-node is a DBV node between two adjacent DBV nodes among the at least two DBV nodes; and different sub-nodes correspond to the same voltage difference.

Description

Voltage control method, device, storage medium and electronic device for pixel circuit

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 8, 2024, with application number 202410030151.5 and invention name “Voltage control method, device, storage medium and electronic device for pixel circuit”, the contents of which should be understood as incorporated into this application by reference. Technical Field

[0002] This article relates to, but is not limited to, the field of display technology, and in particular to a voltage control method, device, storage medium, and electronic device for a pixel circuit. Background Art

[0003] Organic light-emitting diodes (OLEDs) are an emerging display technology. Compared to traditional liquid crystal displays (LCDs), displays made with OLEDs offer wider viewing angles, higher refresh rates, and thinner dimensions. To provide users with a better user experience, electronic devices can pre-set a display brightness value (DBV) for adjusting the brightness of the OLED display. For example, the DBV value can be set to a range of [0, 100]. Users can adjust the brightness of the OLED display by changing the DBV. For example, in bright light, users can increase the DBV value of the OLED display so that they can clearly see the content displayed on the OLED display. In dim light, users can decrease the DBV value to avoid eye irritation caused by a large difference in brightness between the ambient light and the display.

[0004] Since the display brightness of an OLED display is determined by the voltage difference across the light-emitting diodes (LEDs) of the OLED display, adjusting the display brightness of the OLED display is actually adjusting the voltage difference across the LEDs of the OLED display. Furthermore, since the voltage difference across the OLED is related to the difference between the initial voltage of the initial signal line and the cathode voltage (Electro Luminescence Source Supply Voltage, ELVSS) of the OLED, in some embodiments, adjusting the display brightness of the OLED display panel can be achieved by adjusting the initial voltage and the cathode voltage (ELVSS) of the OLED. Summary of the Invention

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] An embodiment of the present disclosure provides a voltage control method for a pixel circuit, wherein the pixel circuit includes a driving module, an initialization module, and a light-emitting element; one end of the driving module is configured to be connected to a first driving voltage and drive the light-emitting element to emit light or extinguish light according to a light-emitting control signal and a data signal provided by a display device to which the pixel circuit belongs; the other end of the driving module is electrically connected to a first electrode of the light-emitting element and one end of the initialization module, respectively; the second electrode of the light-emitting element is configured to be connected to a second driving voltage; the other end of the initialization module is configured to be connected to an initial voltage; and the initialization module is configured to reset the first electrode of the light-emitting element according to the initial voltage; the method includes:

[0007] receiving a display brightness instruction input to the display device;

[0008] determining the current voltage value of the second driving voltage and the voltage value of the initial voltage according to a first correspondence between the display brightness value indicated by the display brightness instruction, a preset display brightness value, the voltage value of the second driving voltage, and the voltage value of the initial voltage;

[0009] Among them, the first correspondence includes the display brightness value corresponding to at least two DBV nodes, the second correspondence between the voltage value of the second driving voltage and the voltage value of the initial voltage, and the third correspondence between the display brightness value corresponding to at least one DBV sub-node and the voltage value of the second driving voltage and the voltage value of the initial voltage; the DBV sub-node is a DBV node between two adjacent DBV nodes among the at least two DBV nodes; the voltage difference corresponding to different sub-nodes is the same, and the voltage difference refers to the absolute value of the difference obtained by subtracting the voltage value of the initial voltage from the voltage value of the second driving voltage corresponding to the same sub-node.

[0010] In an exemplary embodiment, the third corresponding relationship is determined as follows:

[0011] The number N of DBV sub-nodes between two adjacent DBV nodes in the at least two DBV nodes is determined according to a preset step size, where N is a natural number; the voltage value of the second driving voltage, the voltage value of the initial voltage and the display brightness value corresponding to each of the N sub-nodes are determined respectively according to the preset step size, the voltage difference, the voltage value of the second driving voltage corresponding to the two adjacent DBV nodes and the voltage value of the initial voltage.

[0012] In an exemplary embodiment, the preset step size is determined based on the larger step size of the first step size and the second step size, wherein the first step size is the step size used when interpolating the voltage value of the second driving voltage, and the second step size is the step size used when interpolating the voltage value of the initial voltage.

[0013] In an exemplary embodiment, the preset step size is the first step size.

[0014] In an exemplary embodiment, determining the number N of DBV sub-nodes between the two adjacent DBV nodes according to the preset step size includes: taking the value obtained by subtracting the preset step size from the absolute value of the difference between the voltage values ​​of the second driving voltages of the two adjacent DBV nodes and dividing the value by the preset step size as N.

[0015] In an exemplary embodiment, determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub-nodes according to the preset step size, the voltage difference, the voltage value of the second driving voltage corresponding to two adjacent DBV nodes, and the voltage value of the initial voltage, includes:

[0016] Determining a voltage value of the second driving voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the second driving voltages corresponding to two adjacent DBV nodes, and determining an initial voltage value corresponding to each sub-node according to the voltage difference and the voltage value of the second driving voltage corresponding to each sub-node;

[0017] The display brightness value corresponding to each sub-node is determined according to the voltage value of the second driving voltage corresponding to each sub-node and the initial voltage value corresponding to each sub-node.

[0018] In an exemplary embodiment, determining the voltage value of the second driving voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the second driving voltages corresponding to two adjacent DBV nodes includes:

[0019] The voltage value of the second driving voltage corresponding to each sub-node is determined by interpolation operation according to the preset step size and the voltage values ​​of the second driving voltage corresponding to the two adjacent DBV nodes, and the absolute value of the initial voltage value corresponding to each sub-node is negated to obtain the initial voltage value corresponding to each sub-node.

[0020] In an exemplary embodiment, determining the initial voltage value corresponding to each sub-node according to the voltage difference and the voltage value of the second driving voltage corresponding to each sub-node includes:

[0021] The difference between the absolute value of the voltage value of the second driving voltage corresponding to each sub-node and the voltage difference is respectively used as the absolute value of the initial voltage value corresponding to each sub-node.

[0022] In an exemplary embodiment, the preset step size is the second step size.

[0023] In an exemplary embodiment, determining the number N of DBV subnodes between two adjacent DBV nodes according to a preset step size includes: dividing the absolute value of the difference between the initial voltages corresponding to the two adjacent DBV nodes by the preset step size to obtain a result as N.

[0024] In an exemplary embodiment, determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub-nodes according to the preset step size, the voltage difference, and the voltage values ​​of the second driving voltage and the initial voltage of the two adjacent DBV nodes includes:

[0025] Determining a voltage value of the initial voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the initial voltages corresponding to two adjacent DBV nodes, and determining a voltage value of the second driving voltage corresponding to each sub-node according to the voltage difference and the voltage value of the initial voltage corresponding to each sub-node;

[0026] The display brightness value corresponding to each sub-node is determined according to the voltage value of the second driving voltage corresponding to each sub-node and the initial voltage value corresponding to each sub-node.

[0027] In an exemplary embodiment, determining the voltage value of the initial voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the initial voltages corresponding to two adjacent DBV nodes includes:

[0028] The voltage value of the initial voltage corresponding to each sub-node is determined by interpolation operation according to the preset step size and the voltage values ​​of the initial voltages corresponding to two adjacent DBV nodes.

[0029] In an exemplary embodiment, determining the voltage value of the second driving voltage corresponding to each sub-node according to the voltage difference and the voltage value of the initial voltage corresponding to each sub-node includes:

[0030] The absolute value of the voltage value of the initial voltage corresponding to each child node and the sum of the voltage difference are respectively used as the absolute value of the voltage value of the second driving voltage corresponding to each child node, and the absolute value of the voltage value of the second driving voltage corresponding to each child node is negated to obtain the voltage value of the second driving voltage corresponding to each child node.

[0031] The present disclosure provides a voltage control device for a pixel circuit, including a memory and a processor.

[0032] The memory is used to store a program of a voltage control method for a pixel circuit;

[0033] The processor is configured to read and execute a program for the voltage control method for a pixel circuit, and execute any one of the above methods.

[0034] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable the computer to execute any one of the above methods.

[0035] An embodiment of the present disclosure provides an electronic device including the voltage control device for the pixel circuit described above.

[0036] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

[0037] Summary of the Figures

[0038] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation to the technical solution of the present disclosure.

[0039] FIG1 is a schematic diagram of ELVSS and Vinit2 in some embodiments;

[0040] FIG2 is a schematic diagram of ELVSS and Vinit2 obtained by IC automatic interpolation;

[0041] FIG3 is a schematic diagram of a brightness curve in some embodiments;

[0042] FIG4 is a schematic diagram of a CIE curve in some embodiments;

[0043] FIG5 is a schematic diagram of a voltage control method for a pixel circuit according to at least one embodiment of the present disclosure;

[0044] FIG6 is a schematic diagram of a pixel circuit in some embodiments;

[0045] FIG7 is a schematic diagram of a method for determining a third corresponding relationship according to at least one embodiment of the present disclosure;

[0046] FIG8 is a schematic diagram of ELVSS and Vinit2 of a DBV child node in at least one embodiment of the present disclosure;

[0047] FIG9 is a schematic diagram of a brightness curve in at least one embodiment of the present disclosure;

[0048] FIG. 10 is a schematic diagram of a CIE curve in at least one embodiment of the present disclosure.

[0049] Details

[0050] At present, the ELVSS and Vinit2 (initial voltage) corresponding to different DBV (display brightness value) nodes of OLED products are all set dynamic voltages. When the DBV is between two adjacent DBV nodes, the ELVSS and Vinit2 voltages corresponding to the DBV are automatically interpolated and calculated by the display driver inheritance circuit (Display Driver Integrated Circuit, DDIC) in the display device where the OLED display panel is located. The DDIC can determine the target voltage and multiple adjustment voltages of the corresponding cathode according to the display brightness instruction. After determining the above-mentioned multiple adjustment voltages, the DDIC can provide the corresponding voltage adjustment instruction to the power management integrated circuit (PMIC), so that the PMIC can gradually adjust the reference voltage of the corresponding cathode to the target voltage according to the voltage adjustment instruction, thereby completing the smooth transition of the display brightness of the OLED display panel.

[0051] However, in actual applications, there are phenomena such as color change and screen flickering when dragging the display brightness bar. The inventors of the present disclosure measured the ELVSS and Vinit2 waveforms (as shown in Figure 1) through an oscilloscope and found that the voltage difference between ELVSS and Vinit2 (as shown in Figure 2) fluctuated. This is because the interpolation accuracy of ELVSS and Vinit2 is different. The step size (step) used for ELVSS is 0.1V, and the step size used for Vinit2 is 0.01V, which causes the voltage difference between ELVSS and Vinit2 to be not a fixed value during the interpolation process. The pressure difference fluctuation will cause fluctuations in brightness and CIE coordinates (as shown in Figures 3 and 4 below). The ordinate of the measured brightness curve shown in Figure 3 represents brightness, and the abscissa represents the displayed brightness value. In the CIE (English: International Commission on illumination, French: Commission Internationale del′Eclairage, abbreviated as CIE (i.e., International Commission on Illumination)) curve shown in Figure 4, the ordinate of the CIE curve represents CIE coordinates, and the abscissa represents the displayed brightness value. Due to the jumps at certain nodes, when you drag the brightness display bar to change the brightness of the display in low grayscale conditions, color change, screen flickering and other phenomena may occur.

[0052] Figure 5 is a schematic diagram of a voltage control method for a pixel circuit of at least one embodiment of the present disclosure. The pixel circuit includes a driving module, an initialization module, and a light-emitting element; one end of the driving module is configured to access a first driving voltage and drive the light-emitting element to emit light or extinguish light according to a light-emitting control signal and a data signal provided by a display device to which the pixel circuit belongs, the other end of the driving module is electrically connected to the first pole of the light-emitting element and one end of the initialization module, the second pole of the light-emitting element is configured to access a second driving voltage, the other end of the initialization module is configured to access an initial voltage, and the initialization module is configured to reset the first pole of the light-emitting element according to the initial voltage; as shown in Figure 5, the voltage control method for the pixel circuit includes the following steps S51-S52:

[0053] S51, receiving a display brightness instruction input to the display device;

[0054] S52: Determine the current voltage value of the second driving voltage and the voltage value of the initial voltage based on a first correspondence between the display brightness value indicated by the display brightness instruction, a preset display brightness value, and the voltage value of the second driving voltage and the voltage value of the initial voltage.

[0055] Among them, the first correspondence includes the display brightness value corresponding to at least two DBV nodes, the second correspondence between the voltage value of the second driving voltage and the voltage value of the initial voltage, and the third correspondence between the display brightness value corresponding to at least one DBV sub-node and the voltage value of the second driving voltage and the voltage value of the initial voltage; the DBV sub-node is a DBV node between two adjacent DBV nodes among the at least two DBV nodes; the voltage difference corresponding to different sub-nodes is the same, and the voltage difference refers to the absolute value of the difference obtained by subtracting the voltage value of the initial voltage from the voltage value of the second driving voltage corresponding to the same sub-node.

[0056] The embodiment of the present disclosure solves the problem of discoloration and screen flickering when dragging the display brightness bar under low brightness and low grayscale conditions by setting the voltage difference of the DBV sub-nodes between two adjacent DBV nodes to be the same, that is, keeping the voltage difference between the second driving voltage and the initial voltage under the same DBV to a fixed value.

[0057] For example, the light emitting element may be a light emitting diode, the light emitting diode may be an OLED, the first electrode of the light emitting element may be an anode of the OLED, and the second electrode of the light emitting element may be a cathode of the OLED.

[0058] Exemplarily, the first driving voltage is a positive driving voltage, the second driving voltage is a negative driving voltage, the voltage value of the second driving voltage is generally a negative value, and the voltage value of the initial voltage is generally a negative value.

[0059] Exemplarily, the pixel circuit can be a pixel circuit with a 7T1C structure, as shown in FIG6 , where 210 in FIG6 is a driving module, the light-emitting element is an OLED, D represents a data signal line (used to transmit a data signal), and E represents a light-emitting signal line (used to transmit a light-emitting control signal). A first driving voltage is connected from one end of the driving module, the other end of the driving module is connected to the anode of the OLED, and the cathode of the OLED is connected to the second driving voltage. The cathode voltage can be the voltage provided by the second power line ELVSS in the 7T1C pixel driving circuit (i.e., the aforementioned second driving voltage). The initial voltage can be the voltage provided by the initial signal line INIT in the 7T1C pixel driving circuit.

[0060] The 7T1C pixel drive circuit includes seven transistors, one storage capacitor, and seven signal lines. The first and seventh transistors T1 and T7 are reset transistors; the second transistor T2 is a compensation transistor; the third transistor T3 is a drive transistor, whose potential difference between its control electrode and the first electrode determines the magnitude of the drive current flowing between the first power line ELVDD and the second power line VSS; the fourth transistor T4 is a data write transistor; the fifth and sixth transistors T5 and T6 are light-emission control transistors; and the storage capacitor C stores the potential of the gate electrode of the third transistor T3.

[0061] a first scanning signal line S1 , a second scanning signal line S2 , a light emitting signal line E, a data signal line D, an initial signal line INIT, a first power line ELVDD, and a second power line ELVSS.

[0062] In an exemplary embodiment, the operation process of the pixel driving circuit may include:

[0063] The first phase A1 is called the reset phase. The conduction signal of S2 turns on the first transistor T1, and the signal of the initial signal line INIT is provided to the second node N2 to initialize (reset) the storage capacitor C and clear the original charge in the storage capacitor.

[0064] The second phase A2 is called the data writing phase or the threshold compensation phase. The turn-on signal of S1 turns on the second transistor T2, the fourth transistor T4, and the seventh transistor T7. The conduction of the seventh transistor T7 causes the initial voltage of the initial signal line INIT (the voltage value of the initial voltage corresponds to Vinit2 above) to be provided to the first electrode of the OLED, initializing (resetting) the first electrode of the OLED, clearing the pre-stored voltage inside it, and completing the initialization. During this phase, since the second end of the storage capacitor C is at a low level, the third transistor T3 is turned on. The data voltage output by the data signal line D is provided to the second node N2 through the first node N1, the third transistor T3, the third node N3, and the second transistor T2. The voltage at the second end of the storage capacitor C (the second node N2) is Vd-|Vth|.

[0065] In the third stage A3, called the light-emitting stage, the conduction signal of the light-emitting signal line E turns on the fifth transistor T5 and the sixth transistor T6. The power supply voltage output by the first power line VDD provides a driving voltage to the first electrode of the OLED through the turned-on fifth transistor T5, the third transistor T3 and the sixth transistor T6, thereby driving the OLED to emit light.

[0066] During the driving process of the pixel driving circuit, the driving current flowing through the third transistor T3 (driving transistor) is determined by the voltage difference between its gate electrode and the first electrode.

[0067] In some exemplary embodiments, the display brightness instruction refers to an instruction that can represent the display brightness value DBV of the corresponding OLED in the OLED display panel. Exemplarily, the display brightness instruction is the display brightness value DBV.

[0068] In some exemplary embodiments, a DBV node may refer to a pre-set DBV node having a corresponding cathode voltage value (ELVSS) and an initial voltage value (Vinit2). A DBV child node refers to an unset DBV node between two adjacent DBV nodes.

[0069] Illustratively, the voltage difference between the cathode voltage (ELVSS) and the initial voltage (Vinit2) may be maintained at a fixed value (eg, 0.3V).

[0070] FIG7 is a schematic diagram of a method for determining a third correspondence relationship according to at least one embodiment of the present disclosure. As shown in FIG7 , the method for determining the third correspondence relationship includes the following steps S71-S72:

[0071] S71, determining the number N of DBV child nodes between two adjacent DBV nodes among the at least two DBV nodes according to a preset step size;

[0072] S72. Determine the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub-nodes according to the preset step size, the voltage difference, the voltage value of the second driving voltage corresponding to the two adjacent DBV nodes, and the voltage value of the initial voltage.

[0073] Wherein, N is a natural number.

[0074] In an exemplary embodiment, the preset step size is determined based on the larger step size between the first step size and the second step size, wherein the first step size is the step size used when performing an interpolation operation on the voltage value of the second driving voltage, and the second step size is the step size used when performing an interpolation operation on the voltage value of the initial voltage.

[0075] For example, the first step length is 0.1V, and the second step length may be 0.01V.

[0076] In an exemplary embodiment, the preset step size is the first step size.

[0077] In an exemplary embodiment, determining the number N of DBV sub-nodes between the two adjacent DBV nodes according to a preset step size includes: taking the value obtained by subtracting the preset step size from the absolute value of the difference between the voltage values ​​of the second driving voltages of the two adjacent DBV nodes and dividing the value by the preset step size as N.

[0078] For example, as shown in Table 1 and Figure 8 , for DBV node NOR3, NOR3's DBV is 2503, the corresponding second drive voltage (ELVSS) is -1.7V, and the initial voltage (Vinit2) is -1.4V. For DBV node NOR4, NOR4's DBV is 1186, the corresponding second drive voltage (ELVSS) is -1.4V, and the initial voltage (Vinit2) is -1.1V. The first step size is 0.1V, and the second step size is 0.01V. Assuming the first step size is selected as the preset step size, there are two DBV child nodes between NOR3 and NOR4. That is, the absolute value of (((-1.4 - (-1.7)) -0.1) / 0.1 = 2.

[0079] Table 1 Corresponding voltage table of DBV node and DBV subnode

[0080] In an exemplary embodiment, determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub-nodes according to the preset step size, the voltage difference, the voltage value of the second driving voltage corresponding to two adjacent DBV nodes, and the voltage value of the initial voltage, includes:

[0081] Determining a voltage value of the second driving voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the second driving voltages corresponding to two adjacent DBV nodes, and determining an initial voltage value corresponding to each sub-node according to the voltage difference and the voltage value of the second driving voltage corresponding to each sub-node;

[0082] The display brightness value corresponding to each sub-node is determined according to the voltage value of the second driving voltage corresponding to each sub-node and the initial voltage value corresponding to each sub-node.

[0083] In an exemplary embodiment, determining the voltage value of the second driving voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the second driving voltages corresponding to two adjacent DBV nodes includes:

[0084] The voltage value of the second driving voltage corresponding to each sub-node is determined by interpolation operation according to the preset step size and the voltage values ​​of the second driving voltage corresponding to two adjacent DBV nodes.

[0085] In an exemplary embodiment, determining the initial voltage value corresponding to each sub-node according to the voltage difference and the voltage value of the second driving voltage corresponding to each sub-node includes:

[0086] The difference between the absolute value of the voltage value of the second driving voltage corresponding to each subnode and the voltage difference is respectively used as the absolute value of the initial voltage value corresponding to each subnode, and the absolute value of the initial voltage value corresponding to each subnode is negated to obtain the initial voltage value corresponding to each subnode.

[0087] For example, as shown in Table 1, the voltage value of the second driving voltage of the first DBV child node is determined to be -1.5V based on the preset step size and the voltage value of the second driving voltage. Since the voltage difference is 0.3V, 1.5V-0.3V=1.2V is used, and the initial voltage (Vinit2) is negative, which is -1.2V. The cathode voltage value of the second DBV child node is -1.6V, and the initial voltage value (Vinit2) is -1.3V. The voltage value of the second driving voltage of the second DBV child node is -1.6V, and the initial voltage value is -1.3V. Based on table lookup and experience, the DBV of the first DBV child node is determined to be 1625. The DBV of the first DBV child node is 2064.

[0088] In an exemplary embodiment, the preset step size is the second step size.

[0089] In an exemplary embodiment, determining the number N of DBV subnodes between two adjacent DBV nodes according to a preset step size includes: dividing the absolute value of the difference between the initial voltages corresponding to the two adjacent DBV nodes by the preset step size to obtain a result as N.

[0090] In an exemplary embodiment, determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub-nodes according to the preset step size, the voltage difference, and the voltage values ​​of the second driving voltage and the initial voltage of the two adjacent DBV nodes includes:

[0091] Determining a voltage value of the initial voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the initial voltages corresponding to two adjacent DBV nodes, and determining a voltage value of the second driving voltage corresponding to each sub-node according to the voltage difference and the voltage value of the initial voltage corresponding to each sub-node;

[0092] The display brightness value corresponding to each sub-node is determined according to the voltage value of the second driving voltage corresponding to each sub-node and the initial voltage value corresponding to each sub-node.

[0093] In an exemplary embodiment, determining the voltage value of the initial voltage corresponding to each sub-node according to the preset step size and the voltage values ​​of the initial voltages corresponding to two adjacent DBV nodes includes:

[0094] The voltage value of the initial voltage corresponding to each sub-node is determined by interpolation operation according to the preset step size and the voltage values ​​of the initial voltages corresponding to two adjacent DBV nodes.

[0095] In an exemplary embodiment,

[0096] The determining the voltage value of the second driving voltage corresponding to each sub-node according to the voltage difference and the voltage value of the initial voltage corresponding to each sub-node includes:

[0097] The absolute value of the voltage value of the initial voltage corresponding to each child node and the sum of the voltage difference are respectively used as the absolute value of the voltage value of the second driving voltage corresponding to each child node, and the absolute value of the voltage value of the second driving voltage corresponding to each child node is negated to obtain the voltage value of the second driving voltage corresponding to each child node.

[0098] By fixing the voltage difference between the second drive voltage and the initial voltage at the same DBV, the brightness curve shown in Figure 3 is improved to the brightness curve shown in Figure 9, and the CIE curve shown in Figure 4 is improved to the CIE curve shown in Figure 10. Table 2 shows that the brightness jump of the display panel with a grayscale of 16 is improved from 0.1nit to 0.04nit, and the CIE jump is improved from 0.025 to 0.005. The subjective effect is also significantly improved, and the display discoloration and screen flickering caused by dragging the DBV at low grayscales are resolved.

[0099] Table 2 Comparison before and after improvement

[0100] The embodiment of the present disclosure further provides a voltage control device for a pixel circuit, comprising a memory and a processor.

[0101] The memory is used to store a program of a voltage control method for a pixel circuit;

[0102] The processor is used to read and execute the program for the voltage control method for the pixel circuit, and execute the aforementioned method.

[0103] An embodiment of the present disclosure further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable the computer to execute the aforementioned method.

[0104] An embodiment of the present disclosure further provides an electronic device, comprising the aforementioned voltage control device for the pixel circuit.

[0105] The present disclosure describes a plurality of embodiments, but this description is exemplary rather than restrictive, and it will be apparent to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0106] The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features, and elements of the present disclosure may also be combined with any conventional features or elements to form a unique inventive solution defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other inventive solutions to form another unique inventive solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this disclosure may be implemented individually or in any appropriate combination. Therefore, the embodiments are not subject to other limitations except for the limitations set forth in the appended claims and their equivalents. In addition, various modifications and changes may be made within the scope of protection of the appended claims.

[0107] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As will be understood by those skilled in the art, other orders of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation on the claims. In addition, the claims to the method and / or process should not be limited to performing their steps in the order written, and those skilled in the art can readily understand that these orders can be changed and still remain within the spirit and scope of the disclosed embodiments.

[0108] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As is well known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable, and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media generally embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A voltage control method for a pixel circuit, the pixel circuit including a driving module, an initialization module, and a light-emitting element; one end of the driving module is configured to receive a first driving voltage and drive the light-emitting element to emit light or turn off according to a light-emitting control signal and a data signal provided by a display device including the pixel circuit, the other end of the driving module is electrically connected to a first pole of the light-emitting element and one end of the initialization module respectively, a second pole of the light-emitting element is configured to receive a second driving voltage, the other end of the initialization module is configured to receive an initial voltage, and the initialization module is configured to reset the first pole of the light-emitting element according to the initial voltage; this voltage control method includes, Receiving a display brightness instruction input to the display device; Determining the voltage value of the current second driving voltage and the voltage value of the initial voltage according to the display brightness value indicated by the display brightness instruction, a first correspondence relationship between a preset display brightness value, the voltage value of the second driving voltage, and the voltage value of the initial voltage; Among them, The first correspondence relationship includes a display brightness value corresponding to at least two DBV nodes, a second correspondence relationship between the voltage value of the second driving voltage and the voltage value of the initial voltage, and a third correspondence relationship between the display brightness value corresponding to at least one DBV sub-node and the voltage value of the second driving voltage and the voltage value of the initial voltage; the DBV sub-node is a DBV node between two adjacent DBV nodes among the at least two DBV nodes; the voltage differences corresponding to different sub-nodes are the same, and the voltage difference refers to the absolute value of the difference obtained by subtracting the voltage value of the initial voltage from the voltage value of the second driving voltage corresponding to the same sub-node.

2. The voltage control method for a pixel circuit according to claim 1, wherein, The third correspondence relationship is determined in the following manner: Determining the number N of DBV sub-nodes between two adjacent DBV nodes among the at least two DBV nodes according to a preset step size, N being a natural number; Respectively determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub-nodes according to the preset step size, the voltage difference, the voltage value of the second driving voltage corresponding to the two adjacent DBV nodes, and the voltage value of the initial voltage.

3. The voltage control method for a pixel circuit according to claim 1, wherein, The preset step size is determined according to the larger step size between a first step size and a second step size, wherein the first step size is the step size used for interpolation operation on the voltage value of the second driving voltage, and the second step size is the step size used for interpolation operation on the voltage value of the initial voltage.

4. The voltage control method for a pixel circuit according to claim 3, wherein, The preset step size is the first step size.

5. The voltage control method for a pixel circuit according to claim 4, wherein, Determining the number N of DBV sub - nodes between the two adjacent DBV nodes according to a preset step length includes: taking the result obtained by dividing the value obtained by subtracting the preset step length from the absolute value of the difference between the voltage values of the second driving voltages of the two adjacent DBV nodes by the preset step length as N.

6. The method for controlling the voltage of the pixel circuit according to claim 5, wherein, Determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub - nodes according to the preset step length, the voltage difference, the voltage values of the second driving voltages corresponding to the two adjacent DBV nodes, and the voltage value of the initial voltage respectively includes: Determining the voltage value of the second driving voltage corresponding to each sub - node according to the preset step length and the voltage values of the second driving voltages corresponding to the two adjacent DBV nodes, and determining the initial voltage value corresponding to each sub - node according to the voltage difference and the voltage value of the second driving voltage corresponding to each sub - node; Determining the display brightness value corresponding to each sub - node according to the voltage value of the second driving voltage corresponding to each sub - node and the voltage value of the initial voltage corresponding to each sub - node.

7. The method for controlling the voltage of the pixel circuit according to claim 6, wherein, Determining the voltage value of the second driving voltage corresponding to each sub - node according to the preset step length and the voltage values of the second driving voltages corresponding to the two adjacent DBV nodes includes: Determining the voltage value of the second driving voltage corresponding to each sub - node through interpolation operation according to the preset step length and the voltage values of the second driving voltages corresponding to the two adjacent DBV nodes, and taking the negative of the absolute value of the initial voltage value corresponding to each sub - node to obtain the initial voltage value corresponding to each sub - node.

8. The method for controlling the voltage of the pixel circuit according to claim 6, wherein, Determining the initial voltage value corresponding to each sub - node according to the voltage difference and the voltage value of the second driving voltage corresponding to each sub - node includes: Taking the difference between the absolute value of the voltage value of the second driving voltage corresponding to each sub - node and the voltage difference as the absolute value of the initial voltage value corresponding to each sub - node.

9. The method for controlling the voltage of the pixel circuit according to claim 3, wherein, The preset step length is the second step length.

10. The method for controlling the voltage of the pixel circuit according to claim 9, wherein, Determining the number N of DBV sub - nodes between the two adjacent DBV nodes according to the preset step length includes: taking the result obtained by dividing the absolute value of the difference between the voltage values of the initial voltages corresponding to the two adjacent DBV nodes by the preset step length as N.

11. The method for controlling the voltage of the pixel circuit according to claim 10, wherein, Determining the voltage value of the second driving voltage, the voltage value of the initial voltage, and the display brightness value corresponding to each of the N sub - nodes according to the preset step length, the voltage difference, the voltage values of the second driving voltages of the two adjacent DBV nodes, and the voltage values of the initial voltages respectively includes: Determine the voltage values of the initial voltages corresponding to each sub-node according to the preset step size and the voltage values of the initial voltages corresponding to two adjacent DBV nodes, and determine the voltage values of the second driving voltages corresponding to each sub-node according to the voltage difference and the voltage values of the initial voltages corresponding to each sub-node respectively; Determine the display brightness values corresponding to each sub-node according to the voltage values of the second driving voltages corresponding to each sub-node and the voltage values of the initial voltages corresponding to each sub-node.

12. The voltage control method for a pixel circuit according to claim 11, wherein The step of determining the voltage values of the initial voltages corresponding to each sub-node according to the preset step size and the voltage values of the initial voltages corresponding to two adjacent DBV nodes includes: Determine the voltage values of the initial voltages corresponding to each sub-node through interpolation operation according to the preset step size and the voltage values of the initial voltages corresponding to two adjacent DBV nodes.

13. The voltage control method for a pixel circuit according to claim 11, wherein The step of determining the voltage values of the second driving voltages corresponding to each sub-node according to the voltage difference and the voltage values of the initial voltages corresponding to each sub-node respectively includes: Take the sum of the absolute value of the voltage value of the initial voltage corresponding to each sub-node and the voltage difference as the absolute value of the voltage value of the second driving voltage corresponding to each sub-node respectively, and take the negative of the absolute value of the voltage value of the second driving voltage corresponding to each sub-node to obtain the voltage value of the second driving voltage corresponding to each sub-node.

14. A voltage control device for a pixel circuit, comprising a memory and a processor, wherein: The memory is used to store a program for the voltage control method of the pixel circuit; The processor is used to read and execute the program for the voltage control method of the pixel circuit, and execute the method according to any one of claims 1 to 13.

15. A computer-readable storage medium stores computer-executable instructions, wherein, The computer-executable instructions are used to cause the computer to execute the method according to any one of claims 1 to 13.

16. An electronic device, comprising the voltage control device for a pixel circuit according to claim 14.

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