Display module, electronic device and related method

Abstract

A display module, an electronic device and a related method. The display module comprises a drive circuit and a display screen; the display screen comprises a light-emitting device; the drive circuit is used for measuring the working duration of the display screen, adjusting the voltage of the light-emitting device when the working duration reaches a first threshold value, and controlling the light-emitting device to emit light on the basis of the adjusted voltage. The voltage comprises one or more of a data voltage, an anode reset voltage, or a negative electrode voltage of the light emitting device. The present solution can improve the color cast problem of display screens.

Description

Display modules, electronic devices and related methods

[0001] This application claims priority to Chinese Patent Application No. 202410578245.6, filed on May 8, 2024, with the China National Intellectual Property Administration, entitled “Display Module, Electronic Device and Related Methods”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, specifically to display modules, electronic devices, and related methods. Background Technology

[0003] Organic light-emitting diode (OLED) devices have a very broad application prospect in the display field due to their characteristics such as high luminous efficiency, long device life, fast response speed, good viewing angle characteristics, strong color saturation, low cost, and flexibility.

[0004] A display screen may include multiple OLED devices. Each OLED device includes an electroluminescence (EL) device and a pixel circuit that drives the EL device to emit light. Due to the structure of the EL device itself, it possesses an internal capacitance. Part of the driving current output by the pixel circuit is used to charge the internal capacitance of the EL device, and part is used for emission. After prolonged operation, the internal capacitance of the EL device drifts, meaning its size changes. This internal capacitance drift causes the current used to charge the internal capacitance to change accordingly, which in turn affects the magnitude of the current used for emission, resulting in variations in the emission intensity of the EL device. Furthermore, each pixel of the display screen includes an OLED device for emitting red (R), green (G), and blue (B) light. However, the internal capacitance of the EL devices in the three RGB OLED devices may drift differently, causing inconsistent emission intensities among the three EL devices, resulting in color shift. Therefore, how to improve the color shift of the display screen is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides a display module, electronic device, and related method that can improve the color distortion problem of the display screen.

[0006] In a first aspect, this application provides a display module, which includes a driving circuit and a display screen, the display screen including a light-emitting device; the driving circuit is configured to: detect the operating time of the display screen; adjust the voltage of the light-emitting device when the operating time reaches a first threshold; and control the light-emitting device to emit light based on the adjusted voltage. The voltage includes one or more of the data voltage, anode reset voltage, or negative electrode voltage of the light-emitting device.

[0007] Because the brightness of the light-emitting devices in a display changes over time, the above solution can detect the display's operating time. Once a certain threshold is reached, one or more of the data voltage, anode reset voltage, or negative electrode voltage of the light-emitting devices are adjusted to balance their brightness, reduce brightness fluctuations, and thus improve the display's color distortion problem.

[0008] In one possible implementation, the voltage of the aforementioned light-emitting device includes the data voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0009] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0010] Adjust the data voltage of the first light-emitting device so that the driving current of the first light-emitting device is reduced compared to the driving current of the first light-emitting device before the adjustment.

[0011] Adjust the data voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device is reduced compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0012] The data voltage of the aforementioned third light-emitting device is adjusted so that the driving current of the aforementioned third light-emitting device is increased compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0013] For example, the first light-emitting device is a light-emitting device for emitting red light; the second light-emitting device is a light-emitting device for emitting green light; and the third light-emitting device is a light-emitting device for emitting blue light. The first, second, and third light-emitting devices described later are similar and will not be repeated.

[0014] In the above scheme, the driving current formula I based on the light-emitting device ds =0.5*u*C ox *(W / L)*(V data -V dd ) 2 It can be seen that the data voltage V data The output drive current I is different.ds The difference lies in the fact that each pixel of the display screen comprises three light-emitting devices: red, green, and blue (RGB). Based on this, the driving current of the corresponding light-emitting device can be adjusted by changing the data voltage of at least one of the RGB devices. This, in turn, adjusts the brightness of the corresponding light-emitting device, achieving brightness balance among the three RGB devices and reducing color cast.

[0015] In one possible implementation, adjusting the data voltage of the first light-emitting device includes: increasing the data voltage of the first light-emitting device by a first voltage value; adjusting the data voltage of the second light-emitting device includes: increasing the data voltage of the second light-emitting device by a second voltage value; and adjusting the data voltage of the third light-emitting device includes: decreasing the data voltage of the third light-emitting device by a third voltage value.

[0016] In the above scheme, due to the driving voltage V of the pixel circuit dd Greater than the data voltage V data Therefore, based on the formula for the driving current of light-emitting devices, it can be seen that the lower the data voltage, the larger the output driving current, and the higher the brightness of the corresponding light-emitting device. Furthermore, as the operating time increases, due to capacitance drift, the brightness of the blue light-emitting device decreases, while the brightness of the red and green light-emitting devices increases, causing color distortion on the display. Therefore, the data voltage of the red and / or green light-emitting devices can be increased to reduce their brightness, and / or the data voltage of the blue light-emitting device can be decreased to increase its brightness. This balances the brightness of the light-emitting devices and improves the color distortion problem of the display.

[0017] In one possible implementation, the first voltage value is less than the second voltage value, and the second voltage value is greater than the third voltage value.

[0018] In the above solution, the data voltages of all three colors of light-emitting devices are adjusted. Since the brightness of the green light-emitting device increases significantly over time, while the brightness of the blue and red light-emitting devices changes less, the data voltage of the green light-emitting device can be adjusted more to reduce its brightness more significantly, thereby effectively alleviating the color distortion problem of the display screen.

[0019] In one possible implementation, the voltage of the aforementioned light-emitting device includes the anode reset voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0020] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0021] Adjust the anode reset voltage of the aforementioned first light-emitting device so that the driving current of the aforementioned first light-emitting device is increased compared to the driving current of the aforementioned first light-emitting device before the adjustment;

[0022] Adjust the anode reset voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device is increased compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0023] Adjust the anode reset voltage of the aforementioned third light-emitting device so that the driving current of the aforementioned third light-emitting device is increased compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0024] In the above scheme, the pixel circuit typically resets before the next light-emitting cycle. Therefore, assuming the negative electrode voltage of the light-emitting device remains constant, adjusting the anode reset voltage changes the voltage difference between the positive and negative electrodes. This alters the internal charge of the light-emitting device, causing a change in its internal capacitance. This principle can be used to reduce the current used to charge this internal capacitance during the light-emitting phase, increasing the actual current used to drive the light-emitting device compared to before the anode reset voltage adjustment. This reduces the influence of the internal capacitance on the driving current, thereby reducing the change in brightness of the light-emitting device over time and improving the color distortion problem of the display screen.

[0025] In one possible implementation, adjusting the anode reset voltage of the first light-emitting device includes: increasing the anode reset voltage of the first light-emitting device by a fourth voltage value;

[0026] The aforementioned adjustment of the anode reset voltage of the aforementioned second light-emitting device includes: increasing the anode reset voltage of the aforementioned second light-emitting device by a fifth voltage value;

[0027] The aforementioned adjustment of the anode reset voltage of the aforementioned third light-emitting device includes: increasing the anode reset voltage of the aforementioned third light-emitting device by a sixth voltage value.

[0028] In the above scheme, assuming the negative electrode voltage of the light-emitting device remains constant, increasing the anode reset voltage increases the voltage difference between the positive and negative electrodes of the light-emitting device. This allows for pre-filling of a portion of the internal capacitance of the light-emitting device, reducing the current used to charge this internal capacitor during the driving phase. Even if capacitor drift occurs over time, the drift is minimal. The impact on the driving current is also reduced, meaning a decrease in the impact on the brightness of the light-emitting device, thereby improving the color distortion problem of the display screen.

[0029] In one possible implementation, the aforementioned fourth voltage value, the aforementioned fifth voltage value, and the aforementioned sixth voltage value are equal.

[0030] In the above scheme, the anode reset voltage of all three color light-emitting devices is adjusted, and the same voltage value can be increased. This implementation method is simple, and increasing the anode reset voltage of all three color light-emitting devices reduces the size of their internal capacitance. This reduces the impact of internal capacitance drift on the brightness of the three color light-emitting devices, thus balancing the brightness of the three color light-emitting devices and improving the color distortion problem of the display screen.

[0031] In one possible implementation, the voltage of the aforementioned light-emitting device includes the negative electrode voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0032] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0033] Adjust the negative electrode voltage of the aforementioned first light-emitting device so that the driving current of the aforementioned first light-emitting device increases compared to the driving current of the aforementioned first light-emitting device before the adjustment;

[0034] Adjust the negative electrode voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device increases compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0035] Adjust the negative electrode voltage of the aforementioned third light-emitting device so that the driving current of the aforementioned third light-emitting device increases compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0036] In the above scheme, the pixel circuit typically resets before the next light-emitting cycle. Therefore, assuming the anode reset voltage of the light-emitting device remains constant, adjusting the negative electrode voltage changes the voltage difference between the positive and negative electrodes. This alters the internal charge of the light-emitting device, changing its internal capacitance. This principle can be used to reduce the current used to charge this internal capacitance during the light-emitting phase, increasing the actual current used to drive the light-emitting device compared to before the negative electrode voltage adjustment. This reduces the influence of the internal capacitance on the driving current, thereby reducing the change in brightness of the light-emitting device over time and improving the color distortion problem of the display screen.

[0037] In one possible implementation, adjusting the negative electrode voltage of the first light-emitting device includes reducing the negative electrode voltage of the first light-emitting device by a seventh voltage value.

[0038] The aforementioned adjustment of the negative electrode voltage of the aforementioned second light-emitting device includes: reducing the negative electrode voltage of the aforementioned second light-emitting device by an eighth voltage value;

[0039] The aforementioned adjustment of the negative electrode voltage of the aforementioned third light-emitting device includes: reducing the negative electrode voltage of the aforementioned third light-emitting device by a ninth voltage value.

[0040] In the above scheme, assuming the anode reset voltage of the light-emitting device remains constant, reducing the negative electrode voltage can increase the voltage difference between the positive and negative electrodes of the light-emitting device. This allows for the pre-filling of a portion of the internal capacitance of the light-emitting device, reducing the current used to charge this internal capacitor during the light-emitting stage. Even if the capacitor drifts over time, the drift is small, reducing its impact on the driving current and consequently the brightness of the light-emitting device, thus improving the color distortion problem of the display screen.

[0041] In one possible implementation, the aforementioned seventh voltage value, the aforementioned eighth voltage value, and the aforementioned ninth voltage value are equal.

[0042] In the above scheme, the negative electrode voltages of all three color-emitting devices are adjusted, and the voltage values ​​can be reduced by the same amount. This implementation is simple, and reducing the negative electrode voltages of all three color-emitting devices reduces the capacitance drift of these devices. This reduces the impact of internal capacitance drift on the brightness of the three color-emitting devices, thus balancing their brightness and improving the color cast problem of the display screen.

[0043] In one possible implementation, the aforementioned light-emitting device emits light with a low grayscale brightness, wherein the low grayscale brightness is between 0 and 127 grayscale levels.

[0044] In practical implementations, color shift caused by capacitor drift within the light-emitting device is more severe in scenarios displaying low grayscale brightness. In some embodiments, a larger driving current results in greater brightness. Scenarios displaying low grayscale brightness have lower brightness, requiring less driving current compared to scenarios displaying high grayscale brightness. This means that changes in the current used to charge the capacitors within the light-emitting device have a significant impact on the actual current used for light emission, thus significantly affecting brightness and leading to severe color shift. Therefore, the solution adopted in this application embodiment can significantly improve the color shift problem in scenarios displaying low grayscale brightness.

[0045] Secondly, this application provides an electronic device, which includes a housing and a display module, wherein the aforementioned display module is the display module described in any one of the first aspects above.

[0046] Thirdly, this application provides a method for processing color distortion on a display screen, the method comprising:

[0047] The operating time of the aforementioned display screen is measured; the aforementioned display screen includes light-emitting devices;

[0048] When the aforementioned working time reaches the first threshold, the voltage of the aforementioned light-emitting device is adjusted; the aforementioned voltage includes one or more of the aforementioned light-emitting device's data voltage, anode reset voltage, or negative electrode voltage;

[0049] The aforementioned light-emitting device emits light based on the adjusted voltage.

[0050] In one possible implementation, the voltage of the aforementioned light-emitting device includes the data voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0051] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0052] Adjust the data voltage of the first light-emitting device so that the driving current of the first light-emitting device is reduced compared to the driving current of the first light-emitting device before the adjustment.

[0053] Adjust the data voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device is reduced compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0054] The data voltage of the aforementioned third light-emitting device is adjusted so that the driving current of the aforementioned third light-emitting device is increased compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0055] In one possible implementation, adjusting the data voltage of the first light-emitting device includes: increasing the data voltage of the first light-emitting device by a first voltage value;

[0056] The aforementioned adjustment of the data voltage of the aforementioned second light-emitting device includes: increasing the data voltage of the aforementioned second light-emitting device by a second voltage value;

[0057] The aforementioned adjustment of the data voltage of the aforementioned third light-emitting device includes: reducing the data voltage of the aforementioned third light-emitting device by a third voltage value.

[0058] In one possible implementation, the first voltage value is less than the second voltage value, and the second voltage value is greater than the third voltage value.

[0059] In one possible implementation, the voltage of the aforementioned light-emitting device includes the anode reset voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0060] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0061] Adjust the anode reset voltage of the aforementioned first light-emitting device so that the driving current of the aforementioned first light-emitting device is increased compared to the driving current of the aforementioned first light-emitting device before the adjustment;

[0062] Adjust the anode reset voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device is increased compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0063] Adjust the anode reset voltage of the aforementioned third light-emitting device so that the driving current of the aforementioned third light-emitting device is increased compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0064] In one possible implementation, adjusting the anode reset voltage of the first light-emitting device includes: increasing the anode reset voltage of the first light-emitting device by a fourth voltage value;

[0065] The aforementioned adjustment of the anode reset voltage of the aforementioned second light-emitting device includes: increasing the anode reset voltage of the aforementioned second light-emitting device by a fifth voltage value;

[0066] The aforementioned adjustment of the anode reset voltage of the aforementioned third light-emitting device includes: increasing the anode reset voltage of the aforementioned third light-emitting device by a sixth voltage value.

[0067] In one possible implementation, the aforementioned fourth voltage value, the aforementioned fifth voltage value, and the aforementioned sixth voltage value are equal.

[0068] In one possible implementation, the voltage of the aforementioned light-emitting device includes the negative electrode voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0069] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0070] Adjust the negative electrode voltage of the aforementioned first light-emitting device so that the driving current of the aforementioned first light-emitting device increases compared to the driving current of the aforementioned first light-emitting device before the adjustment;

[0071] Adjust the negative electrode voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device increases compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0072] Adjust the negative electrode voltage of the aforementioned third light-emitting device so that the driving current of the aforementioned third light-emitting device increases compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0073] In one possible implementation, adjusting the negative electrode voltage of the first light-emitting device includes reducing the negative electrode voltage of the first light-emitting device by a seventh voltage value.

[0074] The aforementioned adjustment of the negative electrode voltage of the aforementioned second light-emitting device includes: reducing the negative electrode voltage of the aforementioned second light-emitting device by an eighth voltage value;

[0075] The aforementioned adjustment of the negative electrode voltage of the aforementioned third light-emitting device includes: reducing the negative electrode voltage of the aforementioned third light-emitting device by a ninth voltage value.

[0076] In one possible implementation, the aforementioned seventh voltage value, the aforementioned eighth voltage value, and the aforementioned ninth voltage value are equal.

[0077] In one possible implementation, the aforementioned light-emitting device emits light with a low grayscale brightness, wherein the low grayscale brightness is between 0 and 127 grayscale levels.

[0078] Fourthly, this application provides an electronic device, which includes a system chip and a display module, wherein the display module includes a driving circuit and a display screen, and the display screen includes a light-emitting device;

[0079] The aforementioned system chip is used to detect the operating time of the aforementioned display screen; when the aforementioned operating time reaches a first threshold, it sends an indication message to the aforementioned driving circuit.

[0080] The aforementioned driving circuit is used to: receive the aforementioned indication information and adjust the voltage of the aforementioned light-emitting device in response to the aforementioned indication information; the aforementioned voltage includes one or more of the data voltage, anode reset voltage, or negative electrode voltage of the aforementioned light-emitting device;

[0081] The aforementioned driving circuit is also used to: control the aforementioned light-emitting device to emit light based on the adjusted voltage.

[0082] In one possible implementation, the voltage of the aforementioned light-emitting device includes the data voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0083] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0084] Adjust the data voltage of the first light-emitting device so that the driving current of the first light-emitting device is reduced compared to the driving current of the first light-emitting device before the adjustment.

[0085] Adjust the data voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device is reduced compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0086] The data voltage of the aforementioned third light-emitting device is adjusted so that the driving current of the aforementioned third light-emitting device is increased compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0087] In one possible implementation, adjusting the data voltage of the first light-emitting device includes: increasing the data voltage of the first light-emitting device by a first voltage value;

[0088] The aforementioned adjustment of the data voltage of the aforementioned second light-emitting device includes: increasing the data voltage of the aforementioned second light-emitting device by a second voltage value;

[0089] The aforementioned adjustment of the data voltage of the aforementioned third light-emitting device includes: reducing the data voltage of the aforementioned third light-emitting device by a third voltage value.

[0090] In one possible implementation, the first voltage value is less than the second voltage value, and the second voltage value is greater than the third voltage value.

[0091] In one possible implementation, the voltage of the aforementioned light-emitting device includes the anode reset voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0092] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0093] Adjust the anode reset voltage of the aforementioned first light-emitting device so that the driving current of the aforementioned first light-emitting device is increased compared to the driving current of the aforementioned first light-emitting device before the adjustment;

[0094] Adjust the anode reset voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device is increased compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0095] Adjust the anode reset voltage of the aforementioned third light-emitting device so that the driving current of the aforementioned third light-emitting device is increased compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0096] In one possible implementation, adjusting the anode reset voltage of the first light-emitting device includes: increasing the anode reset voltage of the first light-emitting device by a fourth voltage value;

[0097] The aforementioned adjustment of the anode reset voltage of the aforementioned second light-emitting device includes: increasing the anode reset voltage of the aforementioned second light-emitting device by a fifth voltage value;

[0098] The aforementioned adjustment of the anode reset voltage of the aforementioned third light-emitting device includes: increasing the anode reset voltage of the aforementioned third light-emitting device by a sixth voltage value.

[0099] In one possible implementation, the aforementioned fourth voltage value, the aforementioned fifth voltage value, and the aforementioned sixth voltage value are equal.

[0100] In one possible implementation, the voltage of the aforementioned light-emitting device includes the negative electrode voltage of the aforementioned light-emitting device; the aforementioned light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0101] The aforementioned adjustment of the voltage of the aforementioned light-emitting device includes performing at least one of the following operations:

[0102] Adjust the negative electrode voltage of the aforementioned first light-emitting device so that the driving current of the aforementioned first light-emitting device increases compared to the driving current of the aforementioned first light-emitting device before the adjustment;

[0103] Adjust the negative electrode voltage of the aforementioned second light-emitting device so that the driving current of the aforementioned second light-emitting device increases compared to the driving current of the aforementioned second light-emitting device before the adjustment;

[0104] Adjust the negative electrode voltage of the aforementioned third light-emitting device so that the driving current of the aforementioned third light-emitting device increases compared to the driving current of the aforementioned third light-emitting device before the adjustment.

[0105] In one possible implementation, adjusting the negative electrode voltage of the first light-emitting device includes reducing the negative electrode voltage of the first light-emitting device by a seventh voltage value.

[0106] The aforementioned adjustment of the negative electrode voltage of the aforementioned second light-emitting device includes: reducing the negative electrode voltage of the aforementioned second light-emitting device by an eighth voltage value;

[0107] The aforementioned adjustment of the negative electrode voltage of the aforementioned third light-emitting device includes: reducing the negative electrode voltage of the aforementioned third light-emitting device by a ninth voltage value.

[0108] In one possible implementation, the aforementioned seventh voltage value, the aforementioned eighth voltage value, and the aforementioned ninth voltage value are equal.

[0109] In one possible implementation, the aforementioned light-emitting device emits light with a low grayscale brightness, wherein the low grayscale brightness is between 0 and 127 grayscale levels.

[0110] The beneficial effects achieved by the solutions in the second to fourth aspects provided in the embodiments of this application can be found in the corresponding description in the first aspect above, and will not be repeated here. Attached Figure Description

[0111] Figure 1 shows a partial circuit structure diagram of an OLED device.

[0112] Figure 2 shows a schematic diagram of the CIE 1931 color space.

[0113] Figure 3 is a schematic diagram of the structure of the display module provided in an embodiment of this application.

[0114] Figure 4 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application.

[0115] Figure 5 is a schematic diagram of the method flow provided in an embodiment of this application.

[0116] Figure 6 is a schematic diagram of the process of adjusting the data voltage of the light-emitting device multiple times according to an embodiment of this application.

[0117] Figure 7 is a schematic diagram showing the adjustment of data voltage over time according to an embodiment of this application.

[0118] Figure 8 is a schematic diagram of the anode reset voltage and / or negative electrode voltage of the light-emitting device provided in the embodiment of this application being adjusted multiple times. Detailed Implementation

[0119] In this application embodiment, "multiple" refers to two or more. In this application embodiment, "and / or" is used to describe the association relationship of related objects, indicating three relationships that can exist independently. For example, A and / or B can mean: A exists alone, B exists alone, or A and B exist simultaneously. The description methods used in this application embodiment, such as "at least one of a1, a2, ... and an (or at least one of them)," include the case where any one of a1, a2, ... and an exists alone, as well as the case where any combination of any multiple of a1, a2, ... and an exists alone. Each case can exist alone. For example, the description method of "at least one of a, b, and c" includes the cases where a, b, c, a and b combined, a and c combined, b and c combined, or a, b, and c combined.

[0120] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items with substantially the same function. It should be understood that there is no logical or temporal dependency between "first," "second," and "nth," nor does it limit the quantity or order of execution. It should also be understood that although the following description uses the terms "first," "second," etc., to describe various elements, these elements should not be limited by the terms. These terms are merely used to distinguish one element from another.

[0121] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions between the various embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0122] To facilitate understanding of this application, the problems of organic light-emitting diode (OLED) displays are first described with reference to Figure 1. An OLED display may include multiple OLED devices. Each OLED device includes an electroluminescence (EL) device and a pixel circuit that drives the EL device to emit light. For example, Figure 1 provides an exemplary schematic diagram of a partial circuit structure of an OLED device. In Figure 1, the pixel circuit is connected to the light-emitting device. The pixel circuit can be used to provide a driving current to the light-emitting device to drive it to emit light. The light-emitting device is an EL device. Due to the structure of the EL device itself, it has an internal capacitance. To visualize this internal capacitance, it is represented by C1 in Figure 1. That is, the light-emitting device includes an EL light-emitting module and an internal capacitance C1. The internal capacitance C1 can be equivalently represented as a capacitor connected in parallel with the EL light-emitting module.

[0123] The pixel circuit shown in Figure 1 is a partial structure of a pixel circuit. It is understood that there are many variations of pixel circuit structures. This application does not limit the specific structure of the pixel circuit or the connection relationships of the components. A pixel circuit that can be applied to an OLED display to drive the EL device to emit light is the pixel circuit described in this application. The partial pixel circuit structure shown in Figure 1 is only one example; the connection relationships of the components can be found in Figure 1 and will not be described in detail.

[0124] Regardless of the specific structure of the pixel circuit, it includes a data voltage input terminal for the light-emitting device, such as V in Figure 1. data The V data This is the voltage used to characterize pixel data. This voltage V... data When written into the pixel circuit, it can be used to control the output current of the pixel circuit, thereby affecting the brightness of the light-emitting device. For example, in Figure 1, the voltage V... data It can be used to power capacitor C st Charging enables data writing. Different V... data Voltage values ​​can cause different brightness levels in the light-emitting device. The pixel circuit also includes a driving voltage input terminal for the light-emitting device, such as V in Figure 1. dd The driving voltage V dd The input to the pixel circuit generates a driving current to drive the light-emitting device to emit light. This driving current flows to the light-emitting device through the drive transistor (DTFT). The pixel circuit also includes the anode reset voltage input terminal for the light-emitting device, for example, see V in Figure 1. init The V initThis is an initialization control voltage that can reset the anode of the light-emitting device during the OLED device initialization phase. Furthermore, the voltage at the negative electrode of the light-emitting device is the negative electrode voltage, for example, see V in Figure 1. ss .

[0125] For example, as can be seen in Figure 1 above, the gate of the transistor DTFT is connected to the capacitor C. st Connection. The aforementioned voltage V data After being written into the pixel circuit, i.e., the voltage V data Give capacitor C st Once charging is complete, the switching state of each transistor in the pixel circuit can be controlled, and the driving voltage V can be input. dd This generates a drive current. For example, in Figure 1, transistors T2 and T6 can be controlled to turn on, while the other transistors are turned off. Additionally, capacitor C... st The gate voltage of the DTFT transistor can be controlled, allowing the DTFT to conduct normally. This is achieved when the input drive voltage V... dd The resulting driving current can flow to the light-emitting device to drive it to emit light. The magnitude of this driving current can be expressed by the following formula: I ds =0.5*u*C ox *(W / L)*(V data -V dd ) 2 .

[0126] In the above formula, u represents the carrier mobility of the DTFT transistor, and C ox Let I be the gate oxide capacitance per unit area of ​​the DTFT transistor, W be the width of the channel in the DTFT transistor, and L be the length of the channel in the DTFT transistor. Exemplarily, in some implementations, the aforementioned drive current I... ds It can also be called ELV ss .

[0127] Based on the above introduction, due to the presence of an internal capacitor C1 connected in parallel with the EL (Electronic Light Emitting Module) in the light-emitting device, part of the driving current is used to charge this internal capacitor C1, and the other part is used to drive the EL module to emit light. In actual use, after prolonged operation, the internal capacitor C1 will drift, meaning its size will change. This drift causes the current used to charge C1 to change accordingly, thus affecting the magnitude of the current used for light emission and consequently altering the intensity of the light emitted. For example, if the capacitance of C1 increases, a larger current is required to charge it, reducing the actual current used for light emission and thus lowering the light intensity (brightness). Conversely, if the capacitance of C1 decreases, a smaller current is required to charge it, increasing the actual current used for light emission and thus enhancing the light intensity (brightness).

[0128] Furthermore, in an OLED display, each pixel includes an OLED device that emits red (R) light, an OLED device that emits green (G) light, and an OLED device that emits blue (B) light. However, the internal capacitance of the light-emitting devices in the three RGB OLED devices can drift differently, causing inconsistent changes in the luminous intensity of the three devices and resulting in color cast. Specifically, in actual use, the internal capacitance of the blue light-emitting device increases over time, thus reducing its brightness. Conversely, the internal capacitance of the red and green light-emitting devices decreases over time, thus increasing their brightness. Moreover, the internal capacitance of the green light-emitting device decreases more significantly over time, resulting in a greater increase in brightness. This causes the white image displayed on the screen to appear greenish. For easier understanding, please refer to Table 1 and Figure 2 for examples.

[0129] Table 1

[0130] Table 1 above exemplifies the change in the image displayed on the OLED display over time. The unit of time is days. The image quality is indicated in Table 1 by brightness, color, and color difference.

[0131] The unit of brightness mentioned above is nits. Table 1 shows an example of a low grayscale display scene with 32 grayscale levels, represented as 2int 32.

[0132] The colors described above are represented by CIEx and CIEy. CIEx and CIEy represent the horizontal and vertical coordinates in the CIE1931 color space, as illustrated in Figure 2. The CIE1931 color space depicts colors visible to the human eye. As shown in Figure 2, CIEx values ​​can be greater than 0 and less than 0.8, and CIEy values ​​can be greater than 0 and less than 0.9. Furthermore, the color space has a horseshoe-like shape. The three vertices of this color space represent red, green, and blue, respectively, with white located, for example, in the position shown in Figure 2. The region between white and red represents a gradual transition from white to red. As white gradually transitions to red, CIEx increases while CIEy decreases. The region between white and green represents a gradual transition from white to green. As white gradually transitions to green, CIEx decreases while CIEy increases. The region between white and blue represents a gradual transition from white to blue. As white gradually transitions to blue, CIEx decreases while CIEy decreases. Within this color space, each perceptible color has coordinates, which can be represented as (CIEx, CIEy). For example, the coordinates of white are (0.305, 0.321).

[0133] The aforementioned color difference is officially called just noticeable color difference (JNCD). JNCD is one of the indicators for measuring the color accuracy of a monitor. The lower the JNCD value, the higher the color accuracy of the monitor, and the more realistic and vivid the color effects can be presented.

[0134] As shown in Table 1, the brightness of the display increases over time, but so does the color difference, meaning the color cast of the displayed image becomes increasingly severe. Combining Table 1 and Figure 2, it can be seen that when the OLED display has been in operation for 0 days, the color space coordinates (CIEx, CIEy) corresponding to the screen's color are (0.305, 0.321), indicating a white screen. As the operating time gradually increases (Table 1 and Figure 2 exemplify the color changes after 180 days, 365 days, 545 days, and 730 days of OLED display operation), the color space coordinates (CIEx, CIEy) corresponding to the screen's color gradually shift upwards. That is, CIEy gradually increases, causing the screen color to appear greenish.

[0135] For example, particularly in scenarios displaying with low grayscale brightness, the color shift caused by capacitor drift within the light-emitting device is more severe. This low grayscale brightness can be, for example, between grayscale levels 0-127. Corresponding to this low grayscale brightness is high grayscale brightness. This high grayscale brightness can be, for example, between grayscale levels 128-255. Specifically, the larger the driving current, the greater the brightness. In scenarios displaying with low grayscale brightness, the brightness is lower, and the required driving current is also smaller. However, a portion of the current still needs to be used to charge the internal capacitor of the light-emitting device. This current used for charging the internal capacitor is essentially the same as the current used for charging the internal capacitor in scenarios displaying with high grayscale brightness. However, in scenarios displaying with high grayscale brightness, the driving current is larger, and changes in the current used for charging the internal capacitor have a smaller impact on the actual current used for light emission. In contrast, in scenarios displaying with low grayscale brightness, the driving current is smaller, and changes in the current used for charging the internal capacitor have a larger impact on the actual current used for light emission, i.e., a larger impact on brightness. For example, the scenario of displaying with low grayscale brightness could be a scenario of using the display screen outdoors at night or using the display screen after the lights are turned off, etc. This application embodiment does not limit the scenario.

[0136] Based on the above introduction, in order to improve the color shift problem of OLED displays, especially in scenarios with low grayscale brightness, this application provides a display module, an electronic device, and a display color shift processing method. The solution provided by this application can balance the brightness of the light-emitting devices, reduce brightness variations, and thus improve the color shift problem of the display. The embodiments of this application are described below with reference to the accompanying drawings.

[0137] First, a schematic diagram of the display module provided in this application embodiment is given by way of example. Referring to Figure 3, the display module 200 may include a driving circuit 210 and a display screen 220. The display screen 220 includes a pixel circuit 2201 and a light-emitting device 2202. The pixel circuit 2201 and the light-emitting device 2202 are connected, and the pixel circuit 2201 is used to drive the light-emitting device 2202 to emit light. The driving circuit 210 is connected to the display screen 220. The driving circuit 210 can be used to provide the display screen 220 with a data voltage, an anode reset voltage, and a negative voltage for the light-emitting device 2202. The data voltage and anode reset voltage of the light-emitting device 2202 are applied to the light-emitting device 2202 through the pixel circuit 2201. For ease of understanding, please refer to Figure 1 above and its related description, which will not be repeated here.

[0138] For example, in one possible implementation, the driving circuit 210 may include a display driver IC (DDIC). The data voltage, anode reset voltage, and negative electrode voltage of the light-emitting device 2202 can be provided by the DDIC. Optionally, in another implementation, the driving circuit 210 may also include a gate driving module. In a specific implementation, the DDIC can be used to provide a clock signal to the gate driving module. The gate driving module can use the clock signal to provide gate control signals to the transistors in the pixel circuit 2201 to achieve light emission control of the light-emitting device 2202. For example, in one possible implementation, the driving circuit 210 may also include a timing module. The timing module can be used to time the operating duration of the display screen 220. Specific implementation details can be found in the following description and will not be repeated here.

[0139] For example, the display screen 220 may be an OLED display screen. The light-emitting device 2202 may be a device for realizing OLED display light emission, such as the EL device described above, etc., and this application embodiment does not limit this. In addition, the pixel circuit 2201 may be the pixel circuit described in FIG1 or any other pixel circuit for driving the light-emitting device 2202 to emit light, and this application embodiment does not limit this.

[0140] Exemplary, in some embodiments, the display screen 220 described above may include multiple pixels. As described above, each pixel includes three OLED devices (RGB). In this embodiment, a light-emitting device 2202 and the pixel circuit 2201 that drives the light-emitting device 2202 to emit light can be simply referred to as one OLED device. That is, the display screen 220 described above may include multiple pixel circuits 2201 and multiple light-emitting devices 2202. Each light-emitting device 2202 is provided with one pixel circuit 2201 to drive it to emit light.

[0141] It is understood that the structure of the display module shown in Figure 3 above is only an illustration and does not constitute a limitation on the embodiments of this application.

[0142] This application also provides an electronic device. For example, see Figure 4. In Figure 4, the electronic device 300 may include a display module 310. The display module 310 may, for example, be the display module 200 described above. In another possible implementation, the electronic device 300 may also include a system-on-chip (SoC) 320. The SoC 320 may, for example, be the main control chip of the electronic device, a compact and efficient electronic system that integrates multiple functional modules, such as a processor, memory, and interface controller. Exemplarily, in this application embodiment, the SoC 320 can be used to detect the operating time of the display screen in the display module 310. Specific implementation details can be found in the following description and will not be repeated here.

[0143] For example, the electronic device may further include a housing (not shown in FIG4) for fixing and protecting the display module 310. Optionally, it may also be used to fix and protect the system chip 320.

[0144] Exemplary examples include, but are not limited to, any device that includes an OLED display. For instance, such an electronic device may be a smartphone, tablet PC, handheld computer, wearable electronic device, personal computer (PC), desktop computer, television (TV), or smart car, etc. It is understood that the electronic devices listed herein are merely examples and do not constitute a limitation on the embodiments of this application. In specific implementations, other electronic device forms may also be used, which will not be listed in detail here.

[0145] It is understood that the structure of the electronic device shown in Figure 4 above is only an illustration and does not constitute a limitation on the embodiments of this application.

[0146] In conjunction with the display module or electronic device described above, this application provides a method for processing color distortion on a display screen. For example, referring to Figure 5, this method may include, but is not limited to, the following steps.

[0147] S501, Detect the operating time of the display screen; the display screen includes light-emitting devices.

[0148] In one possible implementation, the operating time of the display screen can be detected by a driving circuit in the display module. The display module includes a driving circuit and the aforementioned display screen. For example, the display module can be the display module 200 shown in FIG. 3. The driving circuit is, for example, the driving circuit 210 in the display module 200. The display screen is, for example, the display screen 220 in the display module 200. The light-emitting device included in the display screen can be the light-emitting device 2202 in the display module 200.

[0149] For example, the driving circuit described above includes a timing module. This timing module can start timing when the display screen of the display module is first started working. When the display screen is first started working, the timing module can receive an activation signal, and in response to the activation signal, the timing module starts timing. For example, the activation signal can be a power supply signal to power the timing module, or an indication signal to start timing sent by the DDIC of the driving circuit to the timing module, such as a voltage signal. This application embodiment does not limit the specific implementation of the activation signal.

[0150] For example, in one possible implementation, after the timing module starts timing, it continues timing during the operation of the display screen. When the display screen stops working or the entire display module stops working (i.e., when no content is displayed on the screen), the timing module pauses timing, i.e., it stops calculating the display screen's operating time. The timing module also saves the operating time of the display screen up to the time of pause. When the display screen or the display module restarts working, the timing module resumes timing based on the previously obtained operating time. Thus, the driving circuit, such as a DDIC, can effectively obtain the operating time of the display screen.

[0151] Alternatively, as an example, in another possible implementation, the timing module continues timing during the operation of the display screen after it begins. When the display screen stops operating or the entire display module stops operating, the timing module pauses timing. The driving circuit (e.g., DDIC) obtains and saves the detected display screen operating time from the timing module, and then instructs the timing module to reset to zero. When the display screen or the display module restarts operating, the timing module restarts timing from zero. That is, each time the display screen is used, the timing module restarts timing from zero; then, each time the display screen is stopped, the driving circuit, such as the DDIC, saves the detected operating time and instructs the timing module to reset to zero. The driving circuit, such as the DDIC, can then obtain the display screen's operating time by summing the saved operating times.

[0152] It is understood that the above implementation of the driving circuit detecting the working time of the display screen is merely an example and does not constitute a limitation on the embodiments of this application.

[0153] In another possible implementation, the aforementioned display screen is a display screen within a display module of an electronic device. The electronic device may also include a system-on-a-chip (SoC), which, in some embodiments of this application, can be used to detect the operating duration of the display screen. Exemplarily, the electronic device may be, for example, the electronic device 300 shown in FIG. 4 above. The display module may be, for example, the display module 310 within the electronic device 300. The system chip may be, for example, the system chip 320 within the electronic device 300.

[0154] For example, the system chip described above includes a timing module. This timing module can start timing when the electronic device is first started up. In this implementation, the first startup of the electronic device also means the first startup of its display screen. In some embodiments, when the electronic device is first started up, the timing module can receive an activation signal, and in response to the activation signal, the timing module starts timing. For example, the activation signal can be a power supply signal to power the timing module, or an indication signal sent by the system chip to the timing module to start timing, such as a voltage signal. This application does not limit the specific implementation of the activation signal.

[0155] For example, in one possible implementation, after the timing module starts timing, it continues timing during the operation of the electronic device. When the electronic device stops working, i.e., when no screen content is displayed, the timing module pauses timing, i.e., it stops calculating the screen's operating time. The timing module also saves the operating time of the electronic device up to the time of pause. When the electronic device resumes operation, the timing module continues timing based on the previously obtained operating time. Thus, the system chip can effectively obtain the operating time of the electronic device.

[0156] Alternatively, as an example, in another possible implementation, the timing module continues timing during the operation of the electronic device after it begins timing. When the electronic device stops operating, the timing module pauses timing. The system chip obtains and saves the detected display operation time from the timing module, and then instructs the timing module to reset to zero. When the electronic device starts operating again, the timing module restarts timing from zero. That is, each time the electronic device is used, the timing module restarts timing from zero; then, each time the electronic device is stopped, the system chip saves the detected operation time and instructs the timing module to reset to zero. Thus, the system chip can obtain the display operation time of the electronic device by summing the saved operation times.

[0157] It is understood that the above implementation of the system chip's detection of the display screen's working time is merely an example and does not constitute a limitation on the embodiments of this application.

[0158] S502. When the working time of the display screen reaches the first threshold, adjust the voltage of the light-emitting device.

[0159] In some embodiments of this application, the voltage may include one or more of the data voltage of the light-emitting device, the anode reset voltage, or the negative electrode voltage.

[0160] As can be seen from the above introduction, the working time of the display screen in the display module can be detected by the driving circuit in the display module or by the system chip connected to the display module.

[0161] In one possible implementation, if the operating time of the display screen is detected by the driving circuit, the driving circuit can compare the detected operating time of the display screen with the aforementioned first threshold in real time or at preset time intervals. If the operating time of the display screen reaches the first threshold, the driving circuit adjusts the voltage of the light-emitting device in the display screen. The specific adjustment process is described later and will not be repeated here. For example, the preset time interval can be, for example, 12 hours, a day, a month, a quarter, a half-year, or a year, etc., and this application embodiment does not limit this. For example, the first threshold can be any value between 100 hours and 1000 hours, or the first threshold can be, for example, a quarter, a half-year, or a year, etc., and this application embodiment does not limit this. It is understood that the values ​​of the preset duration and the first threshold mentioned here are merely examples and do not constitute a limitation on the embodiments of this application.

[0162] In another possible implementation, if the operating time of the display screen is detected by the aforementioned system chip, then the system chip can compare the detected operating time of the display screen with the aforementioned first threshold in real time or at preset time intervals. If the operating time of the display screen reaches the first threshold, an indication message is sent to the aforementioned driving circuit. After receiving the indication message, the driving circuit adjusts the voltage of the light-emitting device in the display screen in response to the indication message. The specific adjustment process is described later and will not be repeated here. For example, the indication message may be a voltage signal or a preset control command, etc., and this application embodiment does not limit it.

[0163] In another possible implementation, if the operating time of the display screen is detected by the aforementioned system chip, then the system chip can send the detected operating time of the display screen to the aforementioned driving circuit in real time or at preset intervals. The driving circuit then compares the operating time of the display screen with the aforementioned first threshold. If the operating time of the display screen reaches the first threshold, the driving circuit adjusts the voltage of the light-emitting device in the display screen. The specific adjustment process is described later and will not be repeated here.

[0164] The following is an example illustrating how the driving circuit adjusts the voltage of the light-emitting device in the display screen.

[0165] In one implementation, the voltage of the aforementioned light-emitting device includes its data voltage. A description of the data voltage of the light-emitting device can be found in the preceding description of Figure 1, and will not be repeated here. Based on the foregoing description, each pixel of the display screen may include a first light-emitting device, a second light-emitting device, and a third light-emitting device.

[0166] In some embodiments of this application, the first light-emitting device may include a light-emitting device for emitting red light, the second light-emitting device may include a light-emitting device for emitting green light, and the third light-emitting device may include a light-emitting device for emitting blue light.

[0167] Furthermore, as discussed earlier, due to the drift of the capacitance within the light-emitting device, the brightness of the third light-emitting device decreases over time, while the brightness of the first and second light-emitting devices increases. Generally, the brightness of the second light-emitting device increases more. The decrease in brightness is due to the decrease in the driving current actually used for emitting light from that device. The increase in brightness is due to the increase in the driving current actually used for emitting light from that device. Also, due to the driving voltage V in the pixel circuit... dd Greater than the data voltage V data Therefore, according to the aforementioned formula for calculating the driving current, I... ds =0.5*u*C ox *(W / L)*(V data -V dd ) 2 It can be seen that the data voltage V data The lower the value, the lower the output drive current I. ds The larger the value, the brighter the corresponding light-emitting device. Therefore, to balance the brightness of the three light-emitting devices, the driving circuit can perform at least one of the following adjustment operations.

[0168] The first adjustment operation includes adjusting the data voltage of the first light-emitting device. This reduces the driving current of the first light-emitting device compared to its state before the adjustment. In some embodiments, the data voltage of the first light-emitting device can be increased by a first voltage value, or the data voltage can be increased to a first preset voltage value. Based on the above formula for calculating the driving current, it is known that increasing the data voltage reduces the output driving current. This reduction in the driving current of the first light-emitting device after adjustment reduces its brightness compared to its state before the adjustment. This mitigates the increased brightness caused by the drift of the capacitance within the first light-emitting device.

[0169] For example, in some embodiments, the data voltage of the first light-emitting device described above can be stored in a preset storage space. The driving circuit can modify the data voltage value in the preset storage space to adjust the data voltage. Subsequent voltage adjustments are similar and will not be described in detail.

[0170] The second adjustment operation includes adjusting the data voltage of the second light-emitting device. This reduces the driving current of the second light-emitting device compared to its state before the adjustment. In some embodiments, the data voltage of the second light-emitting device can be increased by a second voltage value, or the data voltage can be increased to a second preset voltage value. Based on the above formula for calculating the driving current, it is known that increasing the data voltage reduces the output driving current. This reduction in the driving current of the second light-emitting device after adjustment reduces the brightness of the second light-emitting device compared to its state before the adjustment. This mitigates the increased brightness caused by the drift of the capacitance within the second light-emitting device.

[0171] The third adjustment operation includes adjusting the data voltage of the third light-emitting device. This increases the driving current of the third light-emitting device compared to its state before the adjustment. In some embodiments, the data voltage of the third light-emitting device can be reduced by a third voltage value, specifically a third preset voltage value. Based on the aforementioned formula for calculating the driving current, a decrease in data voltage leads to an increase in the output driving current. This increased driving current of the third light-emitting device after adjustment enhances its brightness compared to its state before the adjustment, thereby compensating for the reduced brightness caused by the drift of the capacitance within the third light-emitting device.

[0172] In one possible implementation, the first voltage value is less than the second voltage value, and the second voltage value is greater than the third voltage value. In some embodiments, the data voltages of the first, second, and third light-emitting devices can be adjusted together. Furthermore, since the brightness of the second light-emitting device increases significantly over time, while the brightness changes less for the first and third light-emitting devices, the data voltage of the second light-emitting device can be adjusted more to reduce its brightness more significantly, thereby effectively alleviating the color distortion problem of the display screen.

[0173] It is understood that the values ​​of the first voltage value, the second voltage value, the third voltage value, the first preset voltage value, the second preset voltage value, and the third preset voltage value can be determined according to actual application requirements, and the embodiments of this application do not impose any restrictions on this.

[0174] In one possible implementation, the driving circuit can adjust the data voltage of the light-emitting device multiple times. For example, at each interval of the first threshold, the driving circuit can perform at least one of the first adjustment operation, the second adjustment operation, and the third adjustment operation. For ease of understanding, please refer to Figure 6. Figure 6 shows a flowchart illustrating the process of adjusting the data voltage of the light-emitting device multiple times. As shown in Figure 6, after the display screen is turned on, the operating time of the display screen can be detected. The specific implementation of detecting the operating time can refer to the relevant description of step S501 above, and will not be repeated here. After detecting the operating time of the display screen, it can be determined whether the operating time has reached the first threshold. If the operating time of the display screen has not reached the first threshold, then the operating time of the display screen continues to be detected. If the detected operating time reaches the first threshold, then the data voltage of the light-emitting device in the display screen can be adjusted. The specific adjustment process can refer to the aforementioned description, and will not be repeated here. Then, the display screen continues to operate, and the operating time of the display screen can continue to be detected. Similarly, the specific implementation of detecting the operating time can refer to the relevant description of step S501 above, and will not be repeated here. If the operating time of the display screen does not reach the second threshold, the operating time of the display screen continues to be detected. If the detected operating time reaches the second threshold, the data voltage of the light-emitting device in the display screen can be adjusted. The specific adjustment process can be referred to the foregoing description, and will not be repeated here. For example, the value of the second threshold can be twice the first threshold. That is, a voltage adjustment operation is performed once every time interval of the first threshold. Alternatively, for example, the value of the second threshold can be other values, such as 2.5 times or 3 times the first threshold, etc., and this application embodiment does not limit this. Figure 6 shows an example of adjusting the data voltage of the light-emitting device twice. In the specific implementation, the number of times the data voltage is adjusted is not limited. To further understand the implementation of adjusting the data voltage of the light-emitting device multiple times in the embodiments of this application, please refer to Figure 7 for example.

[0175] Figures 7(a), (b), and (c) respectively illustrate schematic diagrams of the data voltages of the first, second, and third light-emitting devices adjusting multiple times over time. In the schematic diagrams shown in Figures 7(a), (b), and (c), the horizontal axis represents the time period, where 0 to 1 represents one time period, 1 to 2 represents one time period, and so on. For example, the value of this time period can be, for instance, the first threshold mentioned above. Furthermore, in Figure 7(a), the vertical axis represents the data voltage of the first light-emitting device. In Figure 7(a), the vertical axis exemplarily shows the data voltage range between 1.8 and 3.0. It is understood that this range is merely an example and does not constitute a limitation on the embodiments of this application. In Figure 7(b), the vertical axis represents the data voltage of the second light-emitting device. In Figure 7(b), the vertical axis exemplarily shows the data voltage range between 1.8 and 3.0. It is understood that this range is merely an example and does not constitute a limitation on the embodiments of this application. In Figure 7(c), the vertical axis represents the data voltage of the third light-emitting device. The vertical axis in Figure 7(c) exemplarily shows a data voltage range between 1.5 and 2.1. It is understood that this range is merely an example and does not constitute a limitation on the embodiments of this application. In Figures 7(a), (b), and (c), it can be seen that the driving circuit adjusts the data voltage of the corresponding light-emitting device once every time period. Furthermore, in Figures 7(a), (b), and (c), it can be seen that with each data voltage adjustment, the data voltages of the first and second light-emitting devices increase, while the data voltage of the third light-emitting device decreases. In some embodiments of this application, the data voltage of the second light-emitting device increases more than the data voltage of the first light-emitting device. The decrease in the data voltage of the third light-emitting device is also greater than the increase in the data voltage of the first light-emitting device. It is understood that Figure 7 is merely an example and does not constitute a limitation on the embodiments of this application. Furthermore, Figure 7 is illustrated using a time interval as an example. In another implementation, the time intervals between multiple voltage adjustments may not be equal. For example, some voltage adjustments may be performed at intervals of one time period, while the next adjustment may be performed at intervals of two time periods, etc. This application does not limit this.

[0176] In some embodiments of this application, a time period can be set to a quarter, a half-year, or a year. For example, the driving circuit can adjust the data voltage of the corresponding light-emitting device once every time period.

[0177] After adjusting the data voltage of the aforementioned light-emitting device, the color cast problem of the display screen can be effectively improved. For easier understanding of the beneficial effects of the embodiments of this application, please refer to Table 2 for example. Table 2 shows an example of a low grayscale display scenario with 32 grayscale levels, represented as 2int 32.

[0178] Table 2

[0179] Tables 1 and 2 exemplify the display screens of OLED displays with and without compensation. The display screen without compensation represents the screen without the aforementioned method of adjusting the data voltage of the light-emitting devices. The display screen with compensation represents the screen after the method is applied. The display screen without compensation corresponds to the data in Table 1. For comparison, Table 2 lists the display screen with compensation.

[0180] As shown in Table 2, compared to the uncompensated screen condition in Table 1, the brightness of the screen in the compensated screen condition changes very little over time, remaining relatively stable. This is because the scheme of adjusting the data voltage of the light-emitting devices compensates for the changes in the brightness of the light-emitting devices, thus reducing the brightness variation and maintaining a relatively stable screen brightness. Furthermore, the color difference of the screen is greatly reduced in the compensated screen condition, meaning the color cast of the displayed image is significantly improved. This is because the scheme of adjusting the data voltage of the light-emitting devices maintains a relatively stable screen brightness and balances the brightness of the RGB light-emitting devices, effectively improving the color cast problem. For example, the following illustrations are provided in conjunction with Figures 2 and 7.

[0181] As can be seen in Table 1 and Figure 2 above, the color space coordinates (CIEx, CIEy) corresponding to the colors of the display screen gradually shift upwards over time. That is, CIEy gradually increases, for example, as shown in Table 1, from 0.321 to 0.516, causing the screen color to lean towards green. After multiple adjustments to the data voltage of the light-emitting devices as shown in Figure 7 above, the brightness of the light-emitting devices of the three colors of RGB can be balanced, thereby improving the color cast problem. For example, taking the light-emitting device emitting red light as the first light-emitting device, the light-emitting device emitting green light as the second light-emitting device, and the light-emitting device emitting blue light as the third light-emitting device. For example, by repeatedly increasing the data voltage of the first light-emitting device, as shown in Figure 7(a), the driving current of the first light-emitting device decreases after the data voltage is increased, and the brightness of the first light-emitting device also decreases, thereby reducing the increased brightness caused by the drift of the capacitor inside the first light-emitting device. This further reduces the possibility of the screen displaying a color biased towards red, that is, the shift of the horizontal coordinate CIEx of the color space corresponding to the colors of the display screen towards red decreases, that is, the shift of CIEx towards the direction of larger values ​​decreases. Secondly, the repeated increases in the data voltage of the second light-emitting device (see Figure 7(b)) reduce the driving current of the second light-emitting device, thus decreasing its brightness and mitigating the increased brightness caused by the capacitance drift within the second light-emitting device. This further alleviates the possibility of the displayed image color being biased towards green; that is, the shift of the color space vertical coordinate CIEy corresponding to the color of the display screen towards green decreases, i.e., the shift of CIEy towards larger values ​​decreases. As shown in Table 2, after 730 days, CIEy only increased from 0.321 to 0.360. Compared to the increase from 0.321 to 0.516 in Table 1, the change is significantly smaller. Similarly, the repeated decreases in the data voltage of the third light-emitting device (see Figure 7(c)) increase the driving current of the third light-emitting device, thus increasing its brightness and compensating for the decreased brightness caused by the capacitance drift within the third light-emitting device. This enhances the blue component in the colors displayed on the screen, meaning the vertical coordinate (CIEx) of the color space corresponding to the screen's color increases compared to the adjustment towards the blue direction, i.e., the CIEx shifts towards smaller values. In one possible implementation, combining the aforementioned multiple increases in the data voltage of the first light-emitting device with the aforementioned multiple decreases in the data voltage of the third light-emitting device can effectively reduce the CIEx shift and maintain its stability. For example, comparing Tables 1 and 2 shows that after 730 days, the CIEx in Table 1 increased from 0.305 to 0.332, while the CIEx in Table 2 increased from 0.305 to 0.316, showing a significantly smaller change.In summary, while the above-described scheme of adjusting the data voltage of the light-emitting device causes a slight shift in the color space coordinates corresponding to the colors on the display screen, this shift is relatively small, especially the change in CIEy is significantly reduced. In other words, the shift in the color space coordinates corresponding to the colors on the compensated display screen is smaller, thus reducing color difference and significantly improving the color cast problem of the display screen.

[0182] In one implementation, the voltage of the aforementioned light-emitting device includes its anode reset voltage and / or negative electrode voltage. For a description of the anode reset voltage and negative electrode voltage, please refer to the description in Figure 1 above; it will not be repeated here. As explained above, the color shift problem arises because the internal capacitance drift of the light-emitting device affects the actual driving current used for light emission, thus affecting the brightness of the light-emitting device and causing color distortion on the display screen. Therefore, to improve the color distortion problem, the influence of the internal capacitance drift of the light-emitting device on the actual driving current used for light emission can be reduced. In a specific implementation, the pixel circuit typically performs an anode reset on the light-emitting device before the next light emission. During this anode reset process, the pixel circuit applies an anode reset voltage to the light-emitting device, restoring it to its initial state and reducing the impact of the previous light emission display on the current display. For example, referring to Figure 1, the anode reset voltage can be applied to the anode of the light-emitting device by turning on transistor T5 in the pixel circuit. During this anode reset process, a current can flow through the light-emitting device due to the voltage difference between the anode reset voltage and the negative electrode voltage. This current is insufficient to make the light-emitting device emit light, but it can charge the internal capacitance of the device. This increases the amount of charge inside the device, thereby reducing the size of the internal capacitance compared to before the anode reset voltage was applied. The greater the voltage difference between the anode reset voltage and the negative electrode voltage, the greater the current flowing through the device. This results in a greater reduction in the size of the internal capacitance compared to before the anode reset voltage was applied. This reduces the current used to charge the internal capacitance during the light-emitting process. Because the internal capacitance is reduced, the impact of internal capacitance drift on the drive current is also reduced. This reduces the influence of internal capacitance drift on the actual drive current used for light emission.

[0183] Based on the above description, in one possible implementation, assuming that the negative electrode voltage of the light-emitting device remains unchanged, the driving circuit can perform at least one of the following adjustment operations from the fourth to the sixth adjustment operations.

[0184] The fourth adjustment operation includes adjusting the anode reset voltage of the first light-emitting device. This increases the driving current of the first light-emitting device compared to its state before the adjustment. In some embodiments, the anode reset voltage of the first light-emitting device can be increased by a fourth voltage value, or it can be increased to a fourth preset voltage value. Based on the above description, when the anode reset voltage of the first light-emitting device increases while the negative electrode voltage remains unchanged, the voltage difference between the anode reset voltage and the negative electrode voltage increases. This increases the current flowing through the first light-emitting device, thereby increasing the amount of charge inside the first light-emitting device and reducing its internal capacitance. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases, thus reducing the impact of internal capacitance drift on the brightness of the first light-emitting device.

[0185] The fifth adjustment operation includes adjusting the anode reset voltage of the second light-emitting device. This increases the driving current of the second light-emitting device compared to its state before the adjustment. In some embodiments, the anode reset voltage of the second light-emitting device can be increased by a fifth voltage value, or it can be increased to a fifth preset voltage value. Based on the above description, when the anode reset voltage of the second light-emitting device increases while the negative electrode voltage remains unchanged, the voltage difference between the anode reset voltage and the negative electrode voltage increases. This increases the current flowing through the second light-emitting device, thereby increasing the amount of charge inside the second light-emitting device and reducing its internal capacitance. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases, thus reducing the impact of internal capacitance drift on the brightness of the second light-emitting device.

[0186] The sixth adjustment operation includes adjusting the anode reset voltage of the third light-emitting device. This increases the driving current of the third light-emitting device compared to its pre-adjustment state. In some embodiments, the anode reset voltage of the third light-emitting device can be increased by a sixth voltage value, or it can be increased to a sixth preset voltage value. Based on the above description, when the anode reset voltage of the third light-emitting device increases while the negative electrode voltage remains unchanged, the voltage difference between the anode reset voltage and the negative electrode voltage increases. This increases the current flowing through the third light-emitting device, thereby increasing the amount of charge inside the device and reducing its internal capacitance. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases, thus reducing the impact of internal capacitance drift on the brightness of the third light-emitting device.

[0187] In one possible implementation, the fourth, fifth, and sixth voltage values ​​can be equal. In some embodiments, the anode reset voltages of the first, second, and third light-emitting devices can be adjusted together. Furthermore, the voltage values ​​can be increased by the same amount. This implementation is simple, and increasing the anode reset voltage of all three color light-emitting devices reduces the internal capacitance of each device. This reduces the impact of internal capacitance drift on the brightness of the three color light-emitting devices, thereby balancing the brightness of the three colors and improving the color cast problem of the display screen.

[0188] In another possible implementation, the fourth, fifth, and sixth voltage values ​​may not be equal. Furthermore, the values ​​of the fourth, fifth, sixth, fourth preset, fifth preset, and sixth preset voltage values ​​can be determined according to actual application requirements, and this application embodiment does not impose any restrictions on this.

[0189] In one possible implementation, assuming the anode reset voltage of the light-emitting device remains unchanged, the driving circuit can perform at least one of the following adjustment operations from the seventh to the ninth adjustment operations.

[0190] The seventh adjustment operation includes adjusting the negative electrode voltage of the first light-emitting device. This increases the driving current of the first light-emitting device compared to its state before the adjustment. In some embodiments, the negative electrode voltage of the first light-emitting device can be reduced to a seventh voltage value, or it can be reduced to a seventh preset voltage value. Based on the above description, when the negative electrode voltage of the first light-emitting device decreases, the anode reset voltage remains unchanged, and the voltage difference between the anode reset voltage and the negative electrode voltage increases. This increases the current flowing through the first light-emitting device, thereby increasing the amount of charge inside the first light-emitting device and reducing the size of its internal capacitance. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases, thus reducing the impact of internal capacitance drift on the brightness of the first light-emitting device.

[0191] The eighth adjustment operation includes adjusting the negative electrode voltage of the second light-emitting device. This increases the driving current of the second light-emitting device compared to its state before the adjustment. In some embodiments, the negative electrode voltage of the second light-emitting device can be reduced to an eighth voltage value, or it can be reduced to an eighth preset voltage value. Based on the above description, when the negative electrode voltage of the second light-emitting device decreases, the anode reset voltage remains unchanged, and the voltage difference between the anode reset voltage and the negative electrode voltage increases. This increases the current flowing through the second light-emitting device, thereby increasing the amount of charge inside the second light-emitting device and reducing the size of the internal capacitance. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases, thus reducing the impact of internal capacitance drift on the brightness of the second light-emitting device.

[0192] The ninth adjustment operation includes adjusting the negative electrode voltage of the third light-emitting device. This increases the driving current of the third light-emitting device compared to its state before the adjustment. In some embodiments, the negative electrode voltage of the third light-emitting device can be reduced to a ninth voltage value, or it can be reduced to a ninth preset voltage value. Based on the above description, when the negative electrode voltage of the third light-emitting device decreases, the anode reset voltage remains unchanged, and the voltage difference between the anode reset voltage and the negative electrode voltage increases. This increases the current flowing through the third light-emitting device, thereby increasing the amount of charge inside the third light-emitting device and reducing the size of its internal capacitance. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases, thus reducing the impact of internal capacitance drift on the brightness of the third light-emitting device.

[0193] In one possible implementation, the seventh, eighth, and ninth voltage values ​​can be equal. In some embodiments, the negative electrode voltages of the first, second, and third light-emitting devices can be adjusted together. Furthermore, reducing the voltage value by the same amount is simple, and increasing the negative electrode voltages of all three color light-emitting devices reduces the internal capacitance of each device. This reduces the impact of internal capacitance drift on the brightness of the three color light-emitting devices, thus balancing their brightness and improving the color cast problem of the display screen.

[0194] In another possible implementation, the seventh voltage value, the eighth voltage value, and the ninth voltage value may not be equal. Furthermore, the values ​​of the seventh voltage value, the eighth voltage value, the ninth voltage value, the seventh preset voltage value, the eighth preset voltage value, and the ninth preset voltage value can be determined according to actual application requirements, and this application embodiment does not impose any restrictions on this.

[0195] In one possible implementation, the driving circuit can simultaneously adjust the anode reset voltage and the negative electrode voltage of the aforementioned light-emitting device. In some embodiments, the driving circuit can perform at least one of the following tenth to twelfth adjustment operations.

[0196] The tenth adjustment operation includes adjusting the anode reset voltage and negative electrode voltage of the first light-emitting device. This increases the driving current of the first light-emitting device compared to its state before the adjustment. In some embodiments, the anode reset voltage of the first light-emitting device can be increased by a tenth voltage value, and the negative electrode voltage can be decreased by an eleventh voltage value. Alternatively, the anode reset voltage of the first light-emitting device can be increased to a tenth preset voltage value, and the negative electrode voltage can be decreased to an eleventh preset voltage value. Based on the above description, it can be seen that when the negative electrode voltage of the first light-emitting device decreases and the anode reset voltage increases, the voltage difference between the anode reset voltage and the negative electrode voltage increases. This results in an increased current flowing through the first light-emitting device. Consequently, the amount of charge inside the first light-emitting device increases, and the size of the internal capacitance decreases. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases. This reduces the impact of internal capacitance drift on the brightness of the first light-emitting device.

[0197] The eleventh adjustment operation includes adjusting the anode reset voltage and negative electrode voltage of the second light-emitting device. This increases the driving current of the second light-emitting device compared to its state before the adjustment. In some embodiments, the anode reset voltage of the second light-emitting device can be increased by a twelfth voltage value, and the negative electrode voltage can be decreased by a thirteenth voltage value. Alternatively, the anode reset voltage of the second light-emitting device can be increased to a twelfth preset voltage value, and the negative electrode voltage can be decreased to a thirteenth preset voltage value. Based on the above description, it can be seen that when the negative electrode voltage of the second light-emitting device decreases and the anode reset voltage increases, the voltage difference between the anode reset voltage and the negative electrode voltage increases. This results in an increased current flowing through the second light-emitting device. Consequently, the amount of charge inside the second light-emitting device increases, and the size of the internal capacitance decreases. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases. This reduces the impact of internal capacitance drift on the brightness of the second light-emitting device.

[0198] The twelfth adjustment operation includes adjusting the anode reset voltage and negative electrode voltage of the third light-emitting device. This increases the driving current of the third light-emitting device compared to its state before the adjustment. In some embodiments, the anode reset voltage of the third light-emitting device can be increased by a fourteenth voltage value, and the negative electrode voltage can be decreased by a fifteenth voltage value. Alternatively, the anode reset voltage of the third light-emitting device can be increased to a fourteenth preset voltage value, and the negative electrode voltage can be decreased to a fifteenth preset voltage value. Based on the above description, it can be seen that when the negative electrode voltage of the third light-emitting device decreases and the anode reset voltage increases, the voltage difference between the anode reset voltage and the negative electrode voltage increases. This results in an increased current flowing through the third light-emitting device. Consequently, the amount of charge inside the third light-emitting device increases, and the size of the internal capacitance decreases. Because the internal capacitance decreases, the influence of internal capacitance drift on the driving current also decreases. This reduces the impact of internal capacitance drift on the brightness of the third light-emitting device.

[0199] In one possible implementation, after adjusting the anode reset voltage and negative electrode voltage of the first, second, and third light-emitting devices, the increments of the voltage differences between the anode reset voltage and negative electrode voltage of these three devices can be equal. For example, the sum of the tenth and eleventh voltage values, the sum of the twelfth and thirteenth voltage values, and the sum of the fourteenth and fifteenth voltage values ​​can be equal. This implementation is simple, and the increased voltage differences between the anode reset voltage and negative electrode voltage of all three color light-emitting devices reduce the size of the internal capacitance of each device. This reduces the impact of internal capacitance drift on the brightness of the three color light-emitting devices, thus balancing the brightness of the three colors and improving the color cast problem of the display screen.

[0200] In another possible implementation, the increments of the voltage difference between the anode reset voltage and the negative electrode voltage of the three light-emitting devices may not be equal. Furthermore, the values ​​of the tenth to fifteenth voltage values ​​and the tenth to fifteenth preset voltage values ​​can be determined according to actual application requirements, and this application embodiment does not impose any limitations on this.

[0201] In one possible implementation, the driving circuit can adjust the anode reset voltage and / or negative electrode voltage of the light-emitting device multiple times. For example, at each interval of the first threshold, the driving circuit can perform one or more of the fourth to twelfth adjustment operations. A flowchart and implementation description of the multiple adjustments of the anode reset voltage and / or negative electrode voltage of the light-emitting device can be found in Figure 6 above, showing a flowchart and related description of the multiple adjustments of the data voltage of the light-emitting device, which will not be repeated here.

[0202] To further understand the implementation of the multiple adjustments to the anode reset voltage and / or negative electrode voltage of the light-emitting device in the embodiments of this application, please refer to Figure 8 as an example. Figure 8 exemplarily illustrates a schematic diagram of the multiple adjustments to the anode reset voltage and / or negative electrode voltage of any one of the first, second, and third light-emitting devices over time. In Figure 8, the adjustment of the anode reset voltage and / or negative electrode voltage is represented by the change in the voltage difference between the anode reset voltage and the negative electrode voltage of the light-emitting device. In Figure 8, the horizontal axis represents the time period, where 0 to 1 represents one time period, 1 to 2 represents one time period, and so on. For example, the value of this time period can be, for example, the first threshold mentioned above. The vertical axis is the voltage difference between the anode reset voltage and the negative electrode voltage of the light-emitting device. In Figure 8, the vertical axis exemplarily shows that the value range of this voltage difference is between 0.3 and 0.9. It should be understood that this value range is only an example and does not constitute a limitation on the embodiments of this application. As shown in Figure 8, the voltage difference between the anode reset voltage and the negative electrode voltage of the light-emitting device increases once every time period, meaning that the driving circuit adjusts the anode reset voltage and / or negative electrode voltage of the light-emitting device once every time period. For example, the anode reset voltage can be increased and / or the negative electrode voltage can be decreased. The specific implementation process can be referred to the foregoing description, which will not be repeated here. The specific value of the increased anode reset voltage and / or decreased negative electrode voltage is not limited. That is, the embodiment of this application does not limit the magnitude of the increased voltage difference. In addition, as shown in Figure 8, the voltage difference between the anode reset voltage and the negative electrode voltage of the light-emitting device gradually increases over time. This reduces the impact of the drift caused by the internal capacitance over time on the brightness of the light-emitting device, thus improving the color distortion problem of the display screen. It is understood that Figure 8 is only an example and does not constitute a limitation on the embodiment of this application.

[0203] In another possible implementation, the driving circuit described above can simultaneously adjust at least two of the following voltages of the third light-emitting device: the data voltage, the anode reset voltage, and the negative electrode voltage. For specific implementation details, please refer to the foregoing description; they will not be repeated here.

[0204] For example, the driving circuit described above can adjust the voltage of some or all of the light-emitting devices in the display screen, and this application embodiment does not limit this.

[0205] S503, Light emission is controlled by the adjusted voltage of the light-emitting device.

[0206] In a specific implementation, after the driving circuit adjusts the voltage of the light-emitting device, it can control the light-emitting device to emit light based on the adjusted voltage.

[0207] For example, taking the aforementioned first light-emitting device as an example, if the driving circuit adjusts the data voltage of the first light-emitting device, the driving circuit can provide the adjusted data voltage to the pixel circuit of the first light-emitting device. This allows the pixel circuit to drive the first light-emitting device to emit light based on the adjusted data voltage. The specific implementation process of the pixel circuit driving the first light-emitting device to emit light is not detailed in this embodiment.

[0208] If the driving circuit adjusts the anode reset voltage of the first light-emitting device, the driving circuit can provide the adjusted anode reset voltage to the pixel circuit of the first light-emitting device. This allows the pixel circuit to drive the first light-emitting device to emit light based on the adjusted anode reset voltage. The specific implementation process of the pixel circuit driving the first light-emitting device to emit light is not detailed in the embodiments of this application.

[0209] If the driving circuit adjusts the negative voltage of the first light-emitting device, the driving circuit can provide the adjusted negative voltage to the first light-emitting device. This allows the pixel circuit to drive the first light-emitting device to emit light based on the adjusted negative voltage. The specific implementation process of the pixel circuit driving the first light-emitting device to emit light is not detailed in the embodiments of this application.

[0210] The same applies to other light-emitting devices, so I won't go into detail.

[0211] In summary, in this embodiment, the brightness of the light-emitting devices in the display screen changes over time. Therefore, the operating time of the display screen can be detected. After the operating time reaches a certain threshold, one or more of the data voltage, anode reset voltage, or negative electrode voltage of the light-emitting devices in the display screen are adjusted to balance the brightness of the light-emitting devices, reduce brightness variations, and thus improve the color distortion problem of the display screen.

[0212] It should be understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0213] It should also be understood that the term “comprising” (also referred to as “includes”, “including”, “comprises” and / or “comprising”) as used in this specification specifies the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0214] It should also be understood that the phrases "an embodiment," "an embodiment," and "a possible implementation" used throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment or implementation is included in at least one embodiment of this application. Therefore, the phrases "in an embodiment," "an embodiment," or "a possible implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0215] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display module, characterized in that, The display module includes a driving circuit and a display screen, the display screen including light-emitting devices; the driving circuit is used for: The operating time of the display screen is detected; When the operating time reaches a first threshold, the voltage of the light-emitting device is adjusted; the voltage includes one or more of the data voltage, anode reset voltage, or negative electrode voltage of the light-emitting device. The light-emitting device emits light based on the adjusted voltage.

2. The display module according to claim 1, characterized in that, The voltage of the light-emitting device includes the data voltage of the light-emitting device; the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; Adjusting the voltage of the light-emitting device includes performing at least one of the following operations: Adjust the data voltage of the first light-emitting device so that the driving current of the first light-emitting device is reduced compared to the driving current of the first light-emitting device before the adjustment; Adjust the data voltage of the second light-emitting device so that the driving current of the second light-emitting device is reduced compared to the driving current of the second light-emitting device before the adjustment; The data voltage of the third light-emitting device is adjusted so that the driving current of the third light-emitting device is increased compared to the driving current of the third light-emitting device before the adjustment.

3. The display module according to claim 2, characterized in that, The adjustment of the data voltage of the first light-emitting device includes: increasing the data voltage of the first light-emitting device by a first voltage value; The adjustment of the data voltage of the second light-emitting device includes: increasing the data voltage of the second light-emitting device by a second voltage value; Adjusting the data voltage of the third light-emitting device includes reducing the data voltage of the third light-emitting device by a third voltage value.

4. The display module according to claim 3, characterized in that, The first voltage value is less than the second voltage value, and the second voltage value is greater than the third voltage value.

5. The display module according to claim 1, characterized in that, The voltage of the light-emitting device includes the anode reset voltage of the light-emitting device; the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; Adjusting the voltage of the light-emitting device includes performing at least one of the following operations: Adjust the anode reset voltage of the first light-emitting device so that the driving current of the first light-emitting device is increased compared to the driving current of the first light-emitting device before the adjustment; Adjust the anode reset voltage of the second light-emitting device so that the driving current of the second light-emitting device is increased compared to the driving current of the second light-emitting device before the adjustment; Adjust the anode reset voltage of the third light-emitting device so that the driving current of the third light-emitting device is increased compared to the driving current of the third light-emitting device before the adjustment.

6. The display module according to claim 5, characterized in that, The adjustment of the anode reset voltage of the first light-emitting device includes: increasing the anode reset voltage of the first light-emitting device by a fourth voltage value; The adjustment of the anode reset voltage of the second light-emitting device includes: increasing the anode reset voltage of the second light-emitting device by a fifth voltage value; The adjustment of the anode reset voltage of the third light-emitting device includes: increasing the anode reset voltage of the third light-emitting device by a sixth voltage value.

7. The display module according to claim 6, characterized in that, The fourth voltage value, the fifth voltage value, and the sixth voltage value are equal.

8. The display module according to any one of claims 1, 5-7, characterized in that, The voltage of the light-emitting device includes the negative electrode voltage of the light-emitting device; the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; Adjusting the voltage of the light-emitting device includes performing at least one of the following operations: Adjust the negative electrode voltage of the first light-emitting device so that the driving current of the first light-emitting device is increased compared with the driving current of the first light-emitting device before the adjustment; Adjust the negative electrode voltage of the second light-emitting device so that the driving current of the second light-emitting device is increased compared with the driving current of the second light-emitting device before the adjustment; Adjust the negative electrode voltage of the third light-emitting device so that the driving current of the third light-emitting device is increased compared to the driving current of the third light-emitting device before the adjustment.

9. The display module according to claim 8, characterized in that, The adjustment of the negative electrode voltage of the first light-emitting device includes: reducing the negative electrode voltage of the first light-emitting device by a seventh voltage value. The adjustment of the negative electrode voltage of the second light-emitting device includes: reducing the negative electrode voltage of the second light-emitting device by an eighth voltage value; Adjusting the negative electrode voltage of the third light-emitting device includes reducing the negative electrode voltage of the third light-emitting device by a ninth voltage value.

10. The display module according to claim 9, characterized in that, The seventh voltage value, the eighth voltage value, and the ninth voltage value are equal.

11. The display module according to any one of claims 2-10, characterized in that, The first light-emitting device is a light-emitting device for emitting red light; the second light-emitting device is a light-emitting device for emitting green light; and the third light-emitting device is a light-emitting device for emitting blue light.

12. The display module according to any one of claims 1-11, characterized in that, The light-emitting device emits light with a low grayscale brightness, which is the brightness between 0 and 127 grayscale levels.

13. An electronic device, characterized in that the electronic device includes a housing and a display module, wherein the display module is the display module according to any one of claims 1-12.

14. A method for processing color cast on a display screen, characterized in that, The method includes: The operating time of the display screen is detected; the display screen includes light-emitting devices; When the operating time reaches a first threshold, the voltage of the light-emitting device is adjusted; the voltage includes one or more of the data voltage, anode reset voltage, or negative electrode voltage of the light-emitting device. The light-emitting device emits light based on the adjusted voltage.

15. The method according to claim 14, characterized in that, The voltage of the light-emitting device includes the data voltage of the light-emitting device; the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; Adjusting the voltage of the light-emitting device includes performing at least one of the following operations: Adjust the data voltage of the first light-emitting device so that the driving current of the first light-emitting device is reduced compared to the driving current of the first light-emitting device before the adjustment; Adjust the data voltage of the second light-emitting device so that the driving current of the second light-emitting device is reduced compared to the driving current of the second light-emitting device before the adjustment; The data voltage of the third light-emitting device is adjusted so that the driving current of the third light-emitting device is increased compared to the driving current of the third light-emitting device before the adjustment.

16. The method according to claim 15, characterized in that, The adjustment of the data voltage of the first light-emitting device includes: increasing the data voltage of the first light-emitting device by a first voltage value; The adjustment of the data voltage of the second light-emitting device includes: increasing the data voltage of the second light-emitting device by a second voltage value; Adjusting the data voltage of the third light-emitting device includes reducing the data voltage of the third light-emitting device by a third voltage value.

17. The method according to claim 16, characterized in that, The first voltage value is less than the second voltage value, and the second voltage value is greater than the third voltage value.

18. The method according to claim 14, characterized in that, The voltage of the light-emitting device includes the anode reset voltage of the light-emitting device; the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; Adjusting the voltage of the light-emitting device includes performing at least one of the following operations: Adjust the anode reset voltage of the first light-emitting device so that the driving current of the first light-emitting device is increased compared to the driving current of the first light-emitting device before the adjustment; Adjust the anode reset voltage of the second light-emitting device so that the driving current of the second light-emitting device is increased compared to the driving current of the second light-emitting device before the adjustment; Adjust the anode reset voltage of the third light-emitting device so that the driving current of the third light-emitting device is increased compared to the driving current of the third light-emitting device before the adjustment.

19. The method according to claim 18, characterized in that, The adjustment of the anode reset voltage of the first light-emitting device includes: increasing the anode reset voltage of the first light-emitting device by a fourth voltage value; The adjustment of the anode reset voltage of the second light-emitting device includes: increasing the anode reset voltage of the second light-emitting device by a fifth voltage value; The adjustment of the anode reset voltage of the third light-emitting device includes: increasing the anode reset voltage of the third light-emitting device by a sixth voltage value.

20. The method according to claim 19, characterized in that, The fourth voltage value, the fifth voltage value, and the sixth voltage value are equal.

21. The method according to any one of claims 14, 18-20, characterized in that, The voltage of the light-emitting device includes the negative electrode voltage of the light-emitting device; the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; Adjusting the voltage of the light-emitting device includes performing at least one of the following operations: Adjust the negative electrode voltage of the first light-emitting device so that the driving current of the first light-emitting device is increased compared with the driving current of the first light-emitting device before the adjustment; Adjust the negative electrode voltage of the second light-emitting device so that the driving current of the second light-emitting device is increased compared with the driving current of the second light-emitting device before the adjustment; Adjust the negative electrode voltage of the third light-emitting device so that the driving current of the third light-emitting device is increased compared to the driving current of the third light-emitting device before the adjustment.

22. The method according to claim 21, characterized in that, The adjustment of the negative electrode voltage of the first light-emitting device includes: reducing the negative electrode voltage of the first light-emitting device by a seventh voltage value. The adjustment of the negative electrode voltage of the second light-emitting device includes: reducing the negative electrode voltage of the second light-emitting device by an eighth voltage value; Adjusting the negative electrode voltage of the third light-emitting device includes reducing the negative electrode voltage of the third light-emitting device by a ninth voltage value.

23. The method according to claim 22, characterized in that, The seventh voltage value, the eighth voltage value, and the ninth voltage value are equal.

24. The method according to any one of claims 15-23, characterized in that, The first light-emitting device is a light-emitting device for emitting red light; the second light-emitting device is a light-emitting device for emitting green light; and the third light-emitting device is a light-emitting device for emitting blue light.

25. The method according to any one of claims 14-24, characterized in that, The light-emitting device emits light with a low grayscale brightness, which is the brightness between 0 and 127 grayscale levels.

26. An electronic device, characterized in that the electronic device includes a system chip and a display module, the display module including a driving circuit and a display screen, the display screen including a light-emitting device; The system chip is used to detect the operating time of the display screen; when the operating time reaches a first threshold, it sends an indication message to the driving circuit. The driving circuit is configured to: receive the indication information and adjust the voltage of the light-emitting device in response to the indication information; the voltage includes one or more of the data voltage, anode reset voltage, or negative electrode voltage of the light-emitting device; The driving circuit is also used to control the light-emitting device to emit light based on the adjusted voltage.

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