Display panel driving method and display device
By providing the LED display light emitting diodes to adjust the driving current value, extend the on-time and consume parasitic capacitors, the problem of white balance color cast in the LED display is solved and the display effect is improved.
Patent Information
- Application Number
- CN202310605034.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-25
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2043-05-25
AI Technical Summary
The LED display is affected by parasitic capacitance during display, resulting in white balance color cast, especially in low grayscale screens, which will be more serious, affecting the display effect.
By providing different adjustment drive current values for a variety of LEDs, the current reaches the target drive current value faster, extends the on-time, and uses the current to consume parasitic capacitors to reduce its impact, thereby improving white balance color cast.
Effectively reduce the impact of parasitic capacitance on LED display screens, improve the accuracy and display effect of white balance, especially in low grayscale screens, which significantly improves luminous inhomogeneity.
Smart Images
Figure CN116758849B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of display technology, and in particular to a display panel driving method and a display device. Background Art
[0002] In recent years, with the development of LED display technology and the increase in market demand, LED display screens have been seen everywhere in public places such as shopping malls and rail transit, used to display pictures, text, videos and other information.
[0003] At present, when LED display screens are displaying, the LED is affected by parasitic capacitance, and the displayed image will have a white balance color cast, which is more serious when displaying low grayscale value images, resulting in poor display effects. Summary of the invention
[0004] In order to solve the above technical problems, the present application provides a display panel driving method and a display device, which can reduce the influence of parasitic capacitance and improve the problem of white balance color cast.
[0005] On the one hand, the present application provides a method for driving a display panel, wherein the display panel includes multiple light-emitting diodes, and different types of light-emitting diodes have different light-emitting colors. The method for driving the display panel includes: obtaining target driving current values corresponding to the multiple light-emitting diodes, each type of light-emitting diode corresponds to a target driving current value; providing currents with corresponding adjusted driving current values to the multiple light-emitting diodes, each type of light-emitting diode corresponds to an adjusted driving current value, and the adjusted driving current value corresponding to each light-emitting diode is different from the target driving current value corresponding to the light-emitting diode; and providing currents with corresponding target driving current values to the multiple light-emitting diodes.
[0006] On the other hand, the present application provides a display device, which includes a memory and a processor, wherein the memory stores a computer program, and the computer program is used for the processor to call and execute the aforementioned display panel driving method.
[0007] The driving method and display device of the display panel provided in the present application, by inputting a current with a magnitude different from the target driving current value before inputting a current with a target driving current value, that is, inputting a current with the adjusted driving current value, so that the magnitude of the current passing through the light-emitting diode can reach the target driving current value corresponding to the light-emitting diode more quickly, thereby extending the conduction time of the light-emitting diode, and part of the current input to the light-emitting diode can be used for the consumption of parasitic capacitance, thereby reducing the influence of parasitic capacitance and improving the problem of white balance color cast. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0009] Figure 1 A flowchart of a method for driving a display panel provided in one embodiment of the present application.
[0010] Figure 2 A schematic diagram showing the relationship between the current setting value and the current input time of some light-emitting diodes.
[0011] Figure 3 for Figure 2 Schematic diagram of the relationship between the actual current value of some light-emitting diodes and the current input time.
[0012] Figure 4 A schematic diagram of the relationship between the current setting value and the current input time of the light emitting diode provided in an embodiment of the present application.
[0013] Figure 5 for Figure 4 Schematic diagram of the relationship between the actual current value of the light-emitting diode and the current input time.
[0014] Figure 6 The figure is a schematic diagram showing the relationship between the actual current values of the three-color light-emitting diodes of some display panels and the current input time.
[0015] Figure 7 A schematic diagram of the relationship between the actual current values of three color light emitting diodes and the current input time provided in an embodiment of the present application.
[0016] Figure 8 A schematic diagram of the preset corresponding relationship between grayscale values and driving current values corresponding to various light-emitting diodes provided in an embodiment of the present application.
[0017] Fig. 9 This is a structural block diagram of a display device provided in one embodiment of the present application.
[0018] Description of main component symbols:
[0019] 100 - display device; 10 - memory; 20 - processor; 30 - display panel. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0021] In the description of this application, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. are used to distinguish different objects rather than to describe a specific order, and therefore should not be understood as limitations on this application.
[0022] In the description of this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components; it can be a communication connection; it can be an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0023] See also Figure 1 , Figure 1 The flowchart of the driving method of the display panel provided in one embodiment of the present application. The driving compensation method of the display panel is applied to the display panel, and the display panel includes a plurality of light emitting diodes, and the light emitting colors of different light emitting diodes are different. Figure 1 As shown, the driving method of the display panel includes the following steps:
[0024] S10: Obtain target driving current values corresponding to the multiple light emitting diodes, where each light emitting diode corresponds to a target driving current value.
[0025] S20: providing currents with corresponding adjusted driving current values to the plurality of light emitting diodes respectively, each light emitting diode corresponds to an adjusted driving current value, and the adjusted driving current value corresponding to each light emitting diode is different from the target driving current value corresponding to the light emitting diode.
[0026] S30: Providing currents having corresponding target driving current values to the plurality of light emitting diodes respectively.
[0027] The driving method of the display panel provided in the embodiment of the present application, by inputting a current with a magnitude different from the target driving current value before inputting a current with a target driving current value, that is, inputting a current with the adjusted driving current value, so that the magnitude of the current passing through the light-emitting diode can reach the target driving current value corresponding to the light-emitting diode more quickly, thereby extending the conduction time of the light-emitting diode, and part of the current input to the light-emitting diode can be used for the consumption of parasitic capacitance, thereby reducing the influence of parasitic capacitance and improving the problem of white balance color cast.
[0028] The adjusted driving current values corresponding to the various light emitting diodes may be the same or different.
[0029] In some embodiments, the plurality of light-emitting diodes include three types, and the light-emitting colors of the three light-emitting diodes are red, blue and green, respectively, and the number of each type of light-emitting diode is at least one. The plurality of light-emitting diodes may be arranged in an array or in other arrangements. The target driving current values corresponding to the red light-emitting diode, the blue light-emitting diode and the green light-emitting diode are different; the adjusted driving current values corresponding to the red light-emitting diode, the blue light-emitting diode and the green light-emitting diode may be the same or different.
[0030] In other embodiments, the plurality of light emitting diodes may include light emitting diodes having other light emitting colors.
[0031] In some embodiments, before providing currents having corresponding adjusted driving current values to the multiple light-emitting diodes respectively, the driving method of the display panel also includes: acquiring a current grayscale value and a target grayscale value of the display panel; and determining the adjusted driving current values corresponding to the multiple light-emitting diodes according to the current grayscale value and the target grayscale value.
[0032] The current grayscale values of the multiple light emitting diodes are the same, and the target grayscale values of the multiple light emitting diodes are the same, so as to emit light of the same brightness, and thus the display panel emits white light.
[0033] Among them, by determining the adjusted driving current value according to the current grayscale value and the target grayscale value, the obtained adjusted driving current value takes into account the factors of the current grayscale value and the target grayscale value, that is, the adjusted driving current value is related to the current grayscale value and the target grayscale value, which is beneficial to provide a suitable adjusted driving current value for the light-emitting diode according to the current size of the light-emitting diode and the size of the current to be reached, so that after providing the light-emitting diode with a current with a corresponding adjusted driving current value, not only can the climbing rate of the actual current value of the light-emitting diode be improved, but also it can be avoided that before the current with the target driving current value is input to the light-emitting diode, the actual current value of the light-emitting diode exceeds the target driving current value, so that the actual current value of the light-emitting diode can gradually increase or decrease from the current value to the corresponding target driving current value.
[0034] Wherein, when the multiple light-emitting diodes include a light-emitting diode that emits red light, a light-emitting diode that emits blue light, and a light-emitting diode that emits green light, the current grayscale values of the light-emitting diode that emits red light, the light-emitting diode that emits blue light, and the light-emitting diode that emits green light are the same, and the target grayscale values are the same. Determining the adjusted driving current values corresponding to the multiple light-emitting diodes according to the current grayscale value and the target grayscale value includes: determining the adjusted driving current values corresponding to the light-emitting diode that emits red light, the light-emitting diode that emits blue light, and the light-emitting diode that emits green light, respectively, according to the current grayscale value and the target grayscale value.
[0035] In some embodiments, determining the adjusted driving current values corresponding to the multiple light-emitting diodes according to the current grayscale value and the target grayscale value includes: when the current grayscale value is less than the target grayscale value, determining that the adjusted driving current values corresponding to the multiple light-emitting diodes are current values greater than the corresponding target driving current values, that is, the adjusted driving current value corresponding to each light-emitting diode is greater than the target driving current value corresponding to the light-emitting diode; when the current grayscale value is greater than the target grayscale value, determining that the adjusted driving current values corresponding to the multiple light-emitting diodes are current values less than the corresponding target driving current values, that is, the adjusted driving current value corresponding to each light-emitting diode is less than the target driving current value corresponding to the light-emitting diode.
[0036] Among them, when the current grayscale value is less than the target grayscale value, it is determined that the adjusted driving current value is greater than the target driving current value, that is, when the light-emitting diode changes from the current grayscale value to the target grayscale value, a current greater than the target driving current value is provided to the light-emitting diode, and then a current equal to the target driving current value is provided, so that the current passing through the light-emitting diode can reach the target driving current value faster, which is equivalent to improving the current climbing rate, so that the current rises to the target driving current value faster, thereby extending the time when the light-emitting diode is turned on at the target driving current value, and part of the current input to the light-emitting diode can be used for the consumption of parasitic capacitance, thereby reducing the influence of parasitic capacitance, and improving the problem of white balance color cast.
[0037] For example, see Figures 2 to 5 , Figure 2 This is a diagram showing the relationship between the current setting value and the current input time of some light-emitting diodes. Figure 3 for Figure 2 Schematic diagram of the relationship between the actual current value of some light-emitting diodes and the current input time, Figure 4 A schematic diagram of the relationship between the current setting value and the current input time of the light emitting diode provided in the embodiment of the present application, Figure 5 for Figure 4 The diagram shows the relationship between the actual current value of the LED and the current input time. Figure 4 and Figure 5 The current grayscale value is less than the target grayscale value. Figures 2 to 5 It can be seen that compared with the changing relationship between the actual current size and the conduction time of the existing light-emitting diode, in the embodiment of the present application, by first providing a current with an adjusted driving current value greater than the target driving current value, the current passing through the light-emitting diode can reach the target driving current value more quickly, thereby extending the conduction time of the light-emitting diode.
[0038] Among them, when the current grayscale value is greater than the target grayscale value, it is determined that the adjusted driving current value is less than the target driving current value, that is, when the light-emitting diode changes from the current grayscale value to the target grayscale value, a current smaller than the target driving current value is provided to the light-emitting diode, so that the current passing through the light-emitting diode can reach the target driving current value faster, which is equivalent to increasing the current decrease rate, so that the current drops to the target driving current faster, thereby extending the time when the light-emitting diode is turned on at the target driving current value, and part of the current input to the light-emitting diode can be used for the consumption of parasitic capacitance, thereby reducing the influence of parasitic capacitance and improving the problem of white balance color cast.
[0039] Exemplarily, when the current grayscale value is 16 and the target grayscale value is 32, the target driving current value corresponding to a certain light-emitting diode is 10mA, and the adjusted driving current value corresponding to this light-emitting diode is greater than 10mA; when the current grayscale value is 64 and the target grayscale value is 32, the target driving current value corresponding to a certain light-emitting diode is 10mA, and the adjusted driving current value corresponding to this light-emitting diode is less than 10mA.
[0040] Among them, when the multiple light-emitting diodes include a red light-emitting diode, a blue light-emitting diode and a green light-emitting diode, and the current grayscale value is less than the target grayscale value, the adjusted driving current value corresponding to the red light-emitting diode is greater than the target current value corresponding to the red light-emitting diode, the adjusted driving current value corresponding to the blue light-emitting diode is greater than the target current value corresponding to the blue light-emitting diode, and the adjusted driving current value corresponding to the green light-emitting diode is greater than the target current value corresponding to the green light-emitting diode; when the current grayscale value is greater than the target grayscale value, the adjusted driving current value corresponding to the red light-emitting diode is less than the target current value corresponding to the red light-emitting diode, the adjusted driving current value corresponding to the blue light-emitting diode is less than the target current value corresponding to the blue light-emitting diode, and the adjusted driving current value corresponding to the green light-emitting diode is less than the target current value corresponding to the green light-emitting diode.
[0041] In some embodiments, the plurality of light emitting diodes reach corresponding target driving current values at the same time, that is, the plurality of light emitting diodes reach their respective corresponding target driving current values at the same time.
[0042] When the plurality of light emitting diodes include a red light emitting diode, a blue light emitting diode and a green light emitting diode, the red light emitting diode, the blue light emitting diode and the green light emitting diode simultaneously reach their respective corresponding target driving current values. Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the relationship between the actual current value of the three-color LEDs of some display panels and the current input time. Figure 7 This is a schematic diagram of the relationship between the actual current values of the three color light emitting diodes and the current input time provided in one embodiment of the present application. Figure 6 and Figure 7 As shown, when the target grayscale values of the three light-emitting diodes are the same, that is, the target brightness is the same, the target driving current values of the blue light-emitting diode, the green light-emitting diode, and the red light-emitting diode increase in sequence. Figure 6As shown in the figure, due to the existence of parasitic capacitance, part of the current input to the light-emitting diode will be used to consume the parasitic capacitance, so that it takes longer for the actual current value of the light-emitting diode to reach the corresponding target driving current value, and the time required for the three light-emitting diodes to reach their respective corresponding target driving current values will be different, resulting in uneven light emission and color cast. Figure 7 As shown, since the current climbing rate of each light emitting diode is improved, the three light emitting diodes can reach their corresponding target driving current values at the same time, thereby improving the problem of white balance color cast.
[0043] In some embodiments, determining the adjusted driving current values corresponding to the multiple light-emitting diodes based on the current grayscale value and the target grayscale value includes: determining the target grayscale correction value corresponding to each light-emitting diode based on the current grayscale value and the target grayscale value; determining the adjusted driving current value corresponding to each light-emitting diode based on the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode.
[0044] Each type of light emitting diode corresponds to a target grayscale correction value, and the target grayscale correction values corresponding to the multiple types of light emitting diodes may be the same or different.
[0045] Wherein, when the plurality of light-emitting diodes include a light-emitting diode that emits red light, a light-emitting diode that emits blue light, and a light-emitting diode that emits green light, the determining of the target grayscale correction value corresponding to each light-emitting diode according to the current grayscale value and the target grayscale value includes: determining the target grayscale correction value corresponding to the light-emitting diode that emits red light, the target grayscale correction value corresponding to the light-emitting diode that emits blue light, and the target grayscale correction value corresponding to the light-emitting diode that emits green light according to the current grayscale value and the target grayscale value. The determining of the adjusted driving current value corresponding to each light-emitting diode according to the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode includes: determining the adjusted driving current value corresponding to the light-emitting diode that emits red light according to the target grayscale value and the target grayscale correction value corresponding to the light-emitting diode that emits red light; determining the adjusted driving current value corresponding to the light-emitting diode that emits blue light according to the target grayscale value and the target grayscale correction value corresponding to the light-emitting diode that emits blue light; and determining the adjusted driving current value corresponding to the light-emitting diode that emits green light according to the target grayscale value and the target grayscale correction value corresponding to the light-emitting diode that emits green light.
[0046] In some embodiments, determining the target grayscale correction value corresponding to each light-emitting diode according to the current grayscale value and the target grayscale value includes: determining the target grayscale correction value corresponding to each light-emitting diode according to the current grayscale value, the target grayscale value and a preset grayscale correction value lookup table, wherein the grayscale correction value lookup table records the correspondence between the current grayscale value, the target grayscale value and the grayscale correction value of each light-emitting diode; determining the adjusted driving current value corresponding to each light-emitting diode according to the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode.
[0047] The target grayscale correction value corresponding to each light emitting diode can be quickly obtained by querying the grayscale correction value query table.
[0048] The display panel may include a storage module, the grayscale correction value query table may be pre-established and the grayscale correction value query table may be pre-stored in the storage module. The storage module may be a non-volatile memory.
[0049] Among them, in some embodiments, the target grayscale correction value corresponding to each light-emitting diode is determined according to the current grayscale value, the target grayscale value and a preset grayscale correction value query table, including: when the current grayscale value is the same as one of the current grayscale values recorded in the grayscale correction value query table, and the target grayscale value is the same as one of the target grayscale values recorded in the grayscale correction value query table, obtaining the target grayscale correction value corresponding to the light-emitting diode by querying the grayscale correction value query table according to the current grayscale value and the target grayscale value.
[0050] Among them, in some other embodiments, the target grayscale correction value corresponding to each light-emitting diode is determined according to the current grayscale value, the target grayscale value and a preset grayscale correction value lookup table, including: when the current grayscale value is different from the current grayscale value recorded in the grayscale correction value lookup table and / or the target grayscale value is different from the target grayscale value recorded in the grayscale correction value lookup table, the target grayscale correction value corresponding to each light-emitting diode is calculated by linear interpolation.
[0051] Among them, when the current grayscale value is different from the current grayscale value recorded in the grayscale correction value query table, and the target grayscale value is the same as the target grayscale value recorded in the grayscale correction value query table, a first current grayscale value greater than the current grayscale value of the display panel and a second current grayscale value less than the current grayscale value of the display panel are selected from the grayscale correction value query table, and a first grayscale correction value corresponding to the first current grayscale value and the target grayscale value, and a second grayscale correction value corresponding to the second current grayscale value and the target grayscale value are obtained by querying, and the current grayscale value of the display panel and the target grayscale correction value corresponding to the target grayscale value are obtained by using the first grayscale correction value, the second grayscale correction value, the first current grayscale value, the second current grayscale value and the current grayscale value of the display panel through linear interpolation.
[0052] Among them, when the current grayscale value is the same as the current grayscale value recorded in the grayscale correction value query table, and the target grayscale value is different from the target grayscale value recorded in the grayscale correction value query table, a first target grayscale value greater than the target grayscale value of the display panel and a second target grayscale value less than the target grayscale value of the display panel are selected from the grayscale correction value query table, and the first target grayscale value and the third grayscale correction value corresponding to the current grayscale value, and the second target grayscale value and the fourth grayscale correction value corresponding to the current grayscale value are obtained by querying, and the target grayscale value of the display panel and the target grayscale correction value corresponding to the current grayscale value are obtained by using the third grayscale correction value, the fourth grayscale correction value, the first target grayscale value, the second target grayscale value and the target grayscale value of the display panel through linear interpolation.
[0053] Wherein, when the current grayscale value is different from the current grayscale value recorded in the grayscale correction value query table, and the target grayscale value is different from the target grayscale value recorded in the grayscale correction value query table, a third current grayscale value greater than the current grayscale value of the display panel and a fourth current grayscale value less than the current grayscale value of the display panel are selected from the grayscale correction value query table, a third target grayscale value greater than the target grayscale value of the display panel and a fourth target grayscale value less than the target grayscale value of the display panel are selected, and a fifth grayscale correction value corresponding to the third target grayscale value and the third current grayscale value is obtained by querying , the fourth target grayscale value and the sixth grayscale correction value corresponding to the fourth current grayscale value, the third current grayscale value and the fourth target grayscale value corresponding to the seventh grayscale correction value, the fourth current grayscale value and the eighth grayscale correction value corresponding to the third target grayscale value, and using the third current grayscale value, the fourth current grayscale value, the third target grayscale value, the fourth target grayscale value, the fifth grayscale correction value, the sixth grayscale correction value, the seventh grayscale correction value, the eighth grayscale correction value, the current grayscale value and the target grayscale value of the display panel, the target grayscale value of the display panel and the target grayscale correction value corresponding to the current grayscale value are calculated by linear interpolation.
[0054] Among them, in some embodiments, the preset grayscale correction value query table includes multiple, each light-emitting diode corresponds to a preset grayscale correction value query table, and the target grayscale correction value corresponding to each light-emitting diode is determined according to the current grayscale value, the target grayscale value and the preset grayscale correction value query table, including: determining the target grayscale correction value corresponding to each light-emitting diode according to the current grayscale value, the target grayscale value and the preset grayscale correction value query table corresponding to each light-emitting diode, and then obtaining the target grayscale correction value corresponding to all light-emitting diodes.
[0055] Wherein, when the multiple types of LEDs include LEDs that emit red light, LEDs that emit blue light, and LEDs that emit green light, the preset grayscale correction value lookup tables include three. The determining the target grayscale correction value corresponding to each LED according to the current grayscale value, the target grayscale value, and the preset grayscale correction value lookup table corresponding to each LED includes: determining the target grayscale correction value corresponding to the LED that emits red light according to the current grayscale value, the target grayscale value, and the preset grayscale correction value lookup table corresponding to the LED that emits red light; determining the target grayscale correction value corresponding to the LED that emits blue light according to the current grayscale value, the target grayscale value, and the preset grayscale correction value lookup table corresponding to the LED that emits blue light; and determining the target grayscale correction value corresponding to the LED that emits green light according to the current grayscale value, the target grayscale value, and the preset grayscale correction value lookup table corresponding to the LED that emits green light.
[0056] Exemplarily, as shown in Table 1, Table 1 is a grayscale correction value query table corresponding to the green-light-emitting diode provided in an embodiment of the present application. When the current grayscale value is 0 and the target grayscale value is 16, the target grayscale correction value corresponding to the green-light-emitting diode is determined to be 2.
[0057] Table 1
[0058]
[0059] Among them, when the current grayscale value is different from the current grayscale value recorded in the grayscale correction value query table, and the target grayscale value is the same as the target grayscale value recorded in the grayscale correction value query table, for example, the current grayscale value of the display panel is 18, and the target grayscale value is 64. The first grayscale correction value corresponding to the current grayscale value of 16 obtained from the grayscale correction value query table is 14, and the second grayscale correction value corresponding to the current grayscale value of 32 is 13. The target grayscale correction value corresponding to the light-emitting diode is the integer part of (13-14) / (32-16)*(18-16)+14, that is, 14.
[0060] Among them, when the current grayscale value is the same as the current grayscale value recorded in the grayscale correction value query table, and the target grayscale value is different from the target grayscale value recorded in the grayscale correction value query table, for example, the current grayscale value of the display panel is 16, and the target grayscale value is 70. The third grayscale correction value corresponding to the target grayscale value of 64 obtained from the grayscale correction value query table is 14, and the second grayscale correction value corresponding to the current grayscale value of 80 is 16. The target grayscale correction value corresponding to the light-emitting diode is the integer part of (16-14) / (80-64)*(70-64)+14, that is, 14.
[0061] Among them, when the current grayscale value is different from the current grayscale value recorded in the grayscale correction value query table, and the target grayscale value is different from the target grayscale value recorded in the grayscale correction value query table, for example, the current grayscale value of the display panel is 18, the target grayscale value is 70, and the target grayscale value is 64 and the fifth grayscale correction value corresponding to the current grayscale of 16 is 14, the target grayscale value is 80 and the sixth grayscale correction value corresponding to the current grayscale of 32 is 13, the target grayscale value is 64 and the seventh grayscale correction value corresponding to the current grayscale of 32 is 13, and the target grayscale value is 80 and the eighth grayscale correction value corresponding to the current grayscale of 16 is 16, the grayscale correction value corresponding to the fourth current grayscale value and the target grayscale value of the display panel is calculated to be the integer part of (16-14) / (80-64)*(70-64)+14, that is, 13, the grayscale correction value corresponding to the third current grayscale value and the target grayscale value of the display panel is calculated to be (14-13) / (80-64)*(70-64)+13, that is, 14, and the target grayscale correction value corresponding to the light-emitting diode is the integer part of (16-14) / (80-64)*(70-64)+14, that is, 13.
[0062] In other embodiments, a preset grayscale correction value query table may include one, which records the correspondence between the current grayscale value, the target grayscale value, and the grayscale correction values corresponding to different types of light-emitting diodes, and can determine the target grayscale correction value corresponding to the light-emitting diode based on the light-emitting color of the light-emitting diode and the current grayscale value and the target grayscale value.
[0063] In some embodiments, each type of light emitting diode corresponds to a preset corresponding relationship between a grayscale value and a driving current value, and the preset corresponding relationship between the grayscale value and the driving current value defines that the grayscale value is positively correlated with the driving current value.
[0064] Among them, see Figure 8 , is a schematic diagram of a preset corresponding relationship between grayscale values and driving current values corresponding to a plurality of light emitting diodes provided in an embodiment of the present application, such as Figure 8 As shown, the preset corresponding relationship between the grayscale value and the driving current value corresponding to the red light emitting diode, the preset corresponding relationship between the grayscale value and the driving current value corresponding to the blue light emitting diode, and the preset corresponding relationship between the grayscale value and the driving current value corresponding to the green light emitting diode are different. At the same grayscale value, the driving current value corresponding to the red light emitting diode, the driving current value corresponding to the green light emitting diode, and the driving current value corresponding to the blue light emitting diode decrease in sequence, that is, to achieve the same luminous brightness, the driving current value required for the red light emitting diode, the driving current value required for the green light emitting diode, and the driving current value required for the blue light emitting diode decreases in sequence.
[0065] Among them, since the grayscale value of each light-emitting diode is positively correlated with the driving current value, when the target grayscale value of the display panel is small, that is, when the display panel is at a low grayscale, the driving current values of the red light-emitting diode, the green light-emitting diode and the blue light-emitting diode are all small, and the input current is partially used for the loss of parasitic capacitance. Therefore, the luminous brightness of the three light-emitting diodes will be affected by the parasitic capacitance and cannot reach the target brightness, making the luminous brightness of the three light-emitting diodes inconsistent, resulting in uneven light emission and color cast problems. In the embodiment of the present application, by first providing an adjusted driving current with a size different from the target driving current value, the size of the current passing through the light-emitting diode can reach the corresponding target driving current value more quickly, which is equivalent to extending the time when the light-emitting diode is turned on at the target driving current value, thereby offsetting the influence of the parasitic capacitance and improving the problem of white balance color cast.
[0066] In some embodiments, determining the adjusted driving current value corresponding to each light-emitting diode according to the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode includes: adding the target grayscale value to the target grayscale correction value corresponding to each light-emitting diode to obtain a corrected target grayscale value for each light-emitting diode, wherein, when the current grayscale value is less than the target grayscale value, the target grayscale correction value corresponding to each light-emitting diode is a positive value, and the obtained corrected target grayscale value is greater than the target grayscale value, and when the current grayscale value is greater than the target grayscale value, the target grayscale correction value corresponding to each light-emitting diode is a negative value, and the obtained corrected target grayscale value is less than the target grayscale value; and determining, according to a preset correspondence between the grayscale value corresponding to each light-emitting diode and the driving current value, that the driving current value corresponding to the corrected target grayscale value of each light-emitting diode is the adjusted driving current value corresponding to the light-emitting diode.
[0067] Among them, when the current grayscale value is less than the target grayscale value, the target grayscale correction value is set to a positive value so that the corrected target grayscale value is greater than the target grayscale value, and the adjusted driving current value is greater than the target driving current value, so that the current passing through the light-emitting diode is first input with a value greater than the target driving current value, and then input with the target driving current value, which can increase the current climbing rate, so that the light-emitting diode reaches the target driving current value faster, thereby extending the conduction time.
[0068] Among them, when the current grayscale value is greater than the target grayscale value, the target grayscale correction value is set to a negative value so that the corrected target grayscale value is less than the target grayscale value, and the adjusted driving current value is less than the target driving current value, so that the current passing through the light-emitting diode is first input with a value less than the target driving current value, and then input with the target driving current value, which can increase the current decrease rate, so that the light-emitting diode reaches the target driving current value faster, thereby extending the conduction time.
[0069] Among them, when the multiple light-emitting diodes include a red light-emitting diode, a blue light-emitting diode and a green light-emitting diode, and the current grayscale value is less than the target grayscale value, the target grayscale correction values corresponding to the red light-emitting diode, the blue light-emitting diode and the green light-emitting diode are all positive values; when the current grayscale value is greater than the target grayscale value, the target grayscale correction values corresponding to the red light-emitting diode, the blue light-emitting diode and the green light-emitting diode are all negative values. The method of adding the target grayscale correction value corresponding to each light-emitting diode to the target grayscale value to obtain the corrected target grayscale value of each light-emitting diode includes: adding the target grayscale correction value corresponding to the light-emitting diode that emits red light to the target grayscale value to obtain the corrected target grayscale value of the light-emitting diode that emits red light; adding the target grayscale correction value corresponding to the light-emitting diode that emits blue light to the target grayscale value to obtain the corrected target grayscale value of the light-emitting diode that emits blue light; and adding the target grayscale correction value corresponding to the light-emitting diode that emits green light to the target grayscale value to obtain the corrected target grayscale value of the light-emitting diode that emits green light.
[0070] Exemplarily, please refer to Table 1 again. When the current grayscale value is 0 and the target grayscale value is 16, the target grayscale correction value corresponding to the green light-emitting diode is determined to be 2, and the corrected target grayscale value corresponding to the green light-emitting diode is 18.
[0071] In some embodiments, when the light-emitting diode changes from different current grayscale values to the same target grayscale value, the corresponding target grayscale correction values are different, and the target grayscale correction value corresponding to the larger current grayscale value is smaller than the target grayscale correction value corresponding to the smaller current grayscale value. Accordingly, the corrected target grayscale value corresponding to the larger current grayscale value is smaller than the corrected target grayscale value corresponding to the smaller current grayscale value. When changing from a larger current grayscale value to the target grayscale value, the required climbing rate is reduced, so that, compared with changing from a smaller current grayscale value to the same target grayscale value, a relatively smaller adjustment driving current value is provided, so that the target driving current value can be quickly reached.
[0072] Exemplarily, as shown in the aforementioned Table 1, when the current grayscale value is 0 and the target grayscale value is 112, the corresponding target grayscale correction value is 21, and the corresponding corrected target grayscale value is 133; when the current grayscale value is 16 and the target grayscale value is 112, the corresponding target grayscale correction value is 19, and the corresponding corrected target grayscale value is 131. The target grayscale correction value decreases, and the corrected target grayscale value also decreases. From the current grayscale value of 0 to the target grayscale value of 112, compared with the change from the current grayscale value of 16 to the target grayscale value of 112, a smaller adjustment drive current value is provided, so that the target drive current value corresponding to the target grayscale value of 112 can be quickly reached.
[0073] In other embodiments, when the light emitting diode changes from different current grayscale values to the same target grayscale value, the corresponding target grayscale correction values are different, and the target grayscale correction value corresponding to the larger current grayscale value is greater than the target grayscale correction value corresponding to the smaller current grayscale value.
[0074] In other embodiments, when the light emitting diodes change from different current grayscale values to the same target grayscale value, the corresponding target grayscale correction values may be the same.
[0075] In some embodiments, when the light emitting diode changes from the same current grayscale value to a different target grayscale value, as the target grayscale value increases, the corresponding target grayscale correction value first increases and then decreases. For example, as shown in the aforementioned Table 1, when the current grayscale value is 0 and the target grayscale value is 48, the corresponding target grayscale correction value is 6; when the current grayscale value is 0 and the target grayscale value is 112, the corresponding target grayscale correction value is 21; when the current grayscale value is 0 and the target grayscale value is 208, the corresponding target grayscale correction value is 14.
[0076] In other embodiments, when the light emitting diode changes from the same current grayscale value to different target grayscale values, the corresponding target grayscale correction values are equal. For example, as shown in the aforementioned Table 1, when the current grayscale value is 32 and the target grayscale value is 224, the corresponding target grayscale correction value is 8; when the current grayscale value is 32 and the target grayscale value is 240, the corresponding target grayscale correction value is 8.
[0077] In some embodiments, obtaining the target driving current values corresponding to the multiple light-emitting diodes includes: obtaining the target grayscale value of the display panel; determining the target driving current values corresponding to the multiple light-emitting diodes according to the target grayscale value, wherein the target driving current values corresponding to the multiple light-emitting diodes are different.
[0078] The target driving current values corresponding to the various light emitting diodes are the same, so that they can emit light with the same brightness. The driving current value of each light emitting diode has a different relationship with the grayscale value, so that the target driving current values corresponding to the various light emitting diodes are different.
[0079] In some embodiments, as described above, each light-emitting diode corresponds to a preset correspondence between a preset grayscale value and a driving current value, and determining the target driving current values corresponding to the multiple light-emitting diodes based on the target grayscale value includes: determining that the driving current value corresponding to each light-emitting diode at the target grayscale value is the target driving current value based on the preset correspondence between the grayscale value and the driving current value corresponding to each light-emitting diode, and then obtaining the target driving current value corresponding to the target grayscale value for all light-emitting diodes.
[0080] For example, according to Figure 8 The relationship diagram between the grayscale value and the driving current value is shown, and the target grayscale value determines the target driving current value corresponding to each light emitting diode.
[0081] See also Fig. 9 , is a structural block diagram of a display device 100 provided in an embodiment of the present application. In some embodiments, Fig. 9 As shown, the display device 100 includes the aforementioned display panel 30, a memory 10 and a processor 20, wherein the memory 10 stores a computer program, and the computer program is used for the processor 20 to call and execute the display panel driving method provided in any of the aforementioned embodiments.
[0082] The display device 100 may be a television, a mobile phone, a tablet, a computer, an electronic display screen, or other electronic devices with a display function.
[0083] The memory 10 may be a flash disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc. The processor 20 may be a processing chip such as a single chip microcomputer, a CPU (central processing unit), or a DSP (digital signal processor).
[0084] In some embodiments, the processor 20 is also used to obtain the current grayscale value and the target grayscale value of the display panel before providing currents with corresponding adjusted driving current values to the multiple light-emitting diodes respectively, and determine the adjusted driving current values corresponding to the multiple light-emitting diodes based on the current grayscale value and the target grayscale value.
[0085] In some embodiments, the processor 20 is used to determine that the adjusted driving current values corresponding to the multiple light-emitting diodes are current values greater than the corresponding target driving current values when the current grayscale value is less than the target grayscale value, and to determine that the adjusted driving current values corresponding to the multiple light-emitting diodes are current values less than the corresponding target driving current values when the current grayscale value is greater than the target grayscale value.
[0086] In some embodiments, the processor 20 determines the adjusted driving current values corresponding to the multiple light-emitting diodes based on the current grayscale value and the target grayscale value, including: determining the target grayscale correction value corresponding to each light-emitting diode based on the current grayscale value and the target grayscale value; determining the adjusted driving current value corresponding to each light-emitting diode based on the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode.
[0087] In some embodiments, the processor 20 determines the target grayscale correction value corresponding to each light-emitting diode based on the current grayscale value and the target grayscale value, including: determining the target grayscale correction value corresponding to each light-emitting diode based on the current grayscale value, the target grayscale value and a preset grayscale correction value query table, wherein the grayscale correction value query table records the correspondence between the current grayscale value, the target grayscale value and the grayscale correction value of each light-emitting diode; determining the adjusted driving current value corresponding to each light-emitting diode based on the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode.
[0088] In some embodiments, each light-emitting diode corresponds to a preset corresponding relationship between a preset grayscale value and a driving current value, and the preset corresponding relationship between the grayscale value and the driving current value defines that the grayscale value is positively correlated with the driving current value. The processor 20 determines the adjusted driving current value corresponding to each light-emitting diode according to the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode, including: adding the target grayscale value to the target grayscale correction value corresponding to each light-emitting diode to obtain the corrected target grayscale value of each light-emitting diode, wherein when the current grayscale value is less than the target grayscale value, the target grayscale correction value corresponding to each light-emitting diode is a positive value, and the corrected target grayscale value obtained is greater than the target grayscale value; when the current grayscale value is greater than the target grayscale value, the target grayscale correction value corresponding to each light-emitting diode is a negative value, and the corrected target grayscale value obtained is less than the target grayscale value; and according to the preset corresponding relationship between the grayscale value and the driving current value corresponding to each light-emitting diode, determine that the driving current value corresponding to the corrected target grayscale value of each light-emitting diode is the adjusted driving current value corresponding to the light-emitting diode.
[0089] In some embodiments, the processor 20 obtains the target driving current values corresponding to the multiple light-emitting diodes, including: obtaining the target grayscale value of the display panel, and determining the target driving current values corresponding to the multiple light-emitting diodes based on the target grayscale value, wherein the target driving current values corresponding to the multiple light-emitting diodes are different.
[0090] In some embodiments, each light-emitting diode corresponds to a preset grayscale value and a preset corresponding relationship between the driving current value, and the preset corresponding relationship between the grayscale value and the driving current value defines that the grayscale value is positively correlated with the driving current value. The processor 20 determines the target driving current values corresponding to the multiple light-emitting diodes according to the target grayscale value, including: according to the preset corresponding relationship between the grayscale value and the driving current value corresponding to each light-emitting diode, determining that the driving current value corresponding to each light-emitting diode at the target grayscale value is the target driving current value, and then obtaining the target driving current values corresponding to the target grayscale values of all light-emitting diodes.
[0091] Among them, the above corresponds to the driving method of the display panel. For more detailed description, please refer to the contents of each embodiment of the driving method of the display panel. The contents of the display device 100 and the driving method of the display panel may also refer to each other.
[0092] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is invoked and executed by a processor to implement the display panel driving method provided in any of the aforementioned embodiments.
[0093] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, which can include: a flash drive, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc.
[0094] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.
[0095] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0096] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.
Claims
1. A method for driving a display panel, wherein the display panel comprises a plurality of light emitting diodes, and the light emitting diodes of different types have different light emitting colors, characterized in that: The driving method of the display panel includes: Obtaining target driving current values corresponding to the multiple light-emitting diodes, each light-emitting diode corresponding to a target driving current value; Providing currents having corresponding adjusted driving current values to the plurality of light emitting diodes respectively, each light emitting diode corresponding to an adjusted driving current value, the adjusted driving current value corresponding to each light emitting diode being different from a target driving current value corresponding to the light emitting diode; and Providing currents having corresponding target driving current values to the plurality of light emitting diodes respectively; Before respectively providing currents having corresponding adjusted driving current values to the multiple light emitting diodes, the display panel driving method further includes: Acquiring a current grayscale value and a target grayscale value of the display panel; Determining the adjusted driving current values corresponding to the multiple light-emitting diodes according to the current grayscale value and the target grayscale value; The step of determining the adjusted driving current values corresponding to the plurality of light emitting diodes according to the current grayscale value and the target grayscale value includes: When the current grayscale value is greater than the target grayscale value, determining that the adjusted driving current values corresponding to the multiple light-emitting diodes are current values less than the corresponding target driving current values; When the current grayscale value is less than the target grayscale value, it is determined that the adjusted driving current values corresponding to the multiple light-emitting diodes are current values greater than the corresponding target driving current values.
2. The method for driving a display panel according to claim 1, wherein: The step of determining the adjusted driving current values corresponding to the plurality of light emitting diodes according to the current grayscale value and the target grayscale value includes: Determine a target grayscale correction value corresponding to each light emitting diode according to the current grayscale value and the target grayscale value; The adjusted driving current value corresponding to each light emitting diode is determined according to the target grayscale value and the target grayscale correction value corresponding to each light emitting diode.
3. The method for driving a display panel according to claim 2, wherein: The step of determining the target grayscale correction value corresponding to each light emitting diode according to the current grayscale value and the target grayscale value includes: Determine the target grayscale correction value corresponding to each light-emitting diode according to the current grayscale value, the target grayscale value and a preset grayscale correction value lookup table, wherein the grayscale correction value lookup table records the corresponding relationship between the current grayscale value, the target grayscale value and the grayscale correction value of each light-emitting diode; The adjusted driving current value corresponding to each light emitting diode is determined according to the target grayscale value and the target grayscale correction value corresponding to each light emitting diode.
4. The method for driving a display panel according to claim 3, wherein: Each light-emitting diode corresponds to a preset corresponding relationship between a preset grayscale value and a driving current value, wherein the preset corresponding relationship between the grayscale value and the driving current value defines that the grayscale value is positively correlated with the driving current value, and the adjusting driving current value corresponding to each light-emitting diode is determined according to the target grayscale value and the target grayscale correction value corresponding to each light-emitting diode, including: The target grayscale value is added to the target grayscale correction value corresponding to each light-emitting diode to obtain a corrected target grayscale value for each light-emitting diode, wherein when the current grayscale value is less than the target grayscale value, the target grayscale correction value corresponding to each light-emitting diode is a positive value, and the corrected target grayscale value obtained is greater than the target grayscale value; when the current grayscale value is greater than the target grayscale value, the target grayscale correction value corresponding to each light-emitting diode is a negative value, and the corrected target grayscale value obtained is less than the target grayscale value; According to the preset corresponding relationship between the grayscale value and the driving current value corresponding to each light emitting diode, the driving current value corresponding to the corrected target grayscale value of each light emitting diode is determined as the adjusted driving current value corresponding to the light emitting diode.
5. The method for driving a display panel according to claim 1, wherein: The obtaining of target driving current values corresponding to the plurality of light emitting diodes includes: Acquiring a target grayscale value of the display panel; The target driving current values corresponding to the multiple light emitting diodes are determined according to the target grayscale value, wherein the target driving current values corresponding to the multiple light emitting diodes are different.
6. The method for driving a display panel according to claim 5, characterized in that: Each light-emitting diode corresponds to a preset corresponding relationship between a preset grayscale value and a driving current value, wherein the preset corresponding relationship between the grayscale value and the driving current value defines that the grayscale value is positively correlated with the driving current value, and the target driving current values corresponding to the multiple light-emitting diodes are determined according to the target grayscale value, including: According to the preset correspondence between the grayscale value and the driving current value corresponding to each light-emitting diode, the driving current value corresponding to the target grayscale value of each light-emitting diode is determined to be the target driving current value, and then the target driving current value corresponding to the target grayscale value of all light-emitting diodes is obtained.
7. The method for driving a display panel according to any one of claims 1 to 6, characterized in that: The multiple light emitting diodes include three types, the light emitting colors of the three light emitting diodes are red, blue and green respectively, and the number of each type of light emitting diode is at least one.
8. A display device, characterized in that: The display device includes a display panel, a memory and a processor, the memory stores a computer program, and the computer program is used for the processor to call and execute the display panel driving method according to any one of claims 1 to 7.