Circuit for improving display smear color and electronic device

Abstract

The application discloses an improved circuit for improving display afterimage color cast and electronic equipment, belonging to the field of display technology. The circuit comprises a light-emitting control and driving module, a resistance value control module and a light-emitting element; the light-emitting control and driving module is connected to the light-emitting element through the resistance value control module, and is used for providing a driving current to the light-emitting element based on a light-emitting signal; the light-emitting element comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the red sub-pixel is connected to the resistance value control module to form a first light-emitting branch, the green sub-pixel is connected to the resistance value control module to form a second light-emitting branch, and the blue sub-pixel is connected to the resistance value control module to form a third light-emitting branch; the light-emitting element is used for emitting light under the action of the driving current; and the resistance value control module is used for adjusting the resistance value of at least one light-emitting branch to match the light-emitting response time of each sub-pixel of the light-emitting element in the case that the brightness is switched, wherein the light-emitting branch comprises the first light-emitting branch, the second light-emitting branch and the third light-emitting branch.

Description

Technical Field

[0001] This application belongs to the field of display technology, specifically relating to a circuit and electronic device for improving display ghosting and color distortion. Background Technology

[0002] AMOLED (Active Matrix Organic Light Emitting Diode) display technology features high contrast, fast response, wide viewing angle, and wide color gamut, and is currently widely used in smartphones and smartwatches. AMOLED pixel driving circuits typically consist of multiple TFTs (Thin Film Transistors), such as the 8T1C LTPO (Low Temperature Polycrystalline Oxide) AMOLED pixel driving circuit, which consists of six P-type TFTs and two N-type TFTs.

[0003] In the light-emitting phase of an AMOLED display, the driving current first charges the AMOLED's own parasitic capacitance. Only after the parasitic capacitance is fully charged can the AMOLED emit light. Because the capacitance and on-time characteristics of the light-emitting materials in the R (red), G (green), and B (blue) sub-pixels of an AMOLED are not entirely consistent, when the display interface switches from a lower brightness, lower grayscale to a higher brightness, the parasitic capacitance of the G sub-pixel is at its maximum at the moment of on-time, resulting in the longest charging time and the slowest light-emitting response time. Conversely, the parasitic capacitance of the R and B sub-pixels is smaller, resulting in shorter charging times and faster light-emitting response times. Therefore, the colors produced after the RGB sub-pixels mix can exhibit ghosting and color shifts, appearing as a reddish or purplish tint. Summary of the Invention

[0004] The purpose of this application is to provide a circuit and electronic device that improves display ghosting and color distortion, thereby solving the problem of display ghosting and color distortion in related technologies.

[0005] In a first aspect, embodiments of this application provide a circuit for improving display ghosting and color distortion, including:

[0006] Light emission control and driving module, resistance adjustment module, and light emission element;

[0007] The light emission control and driving module is connected to the light emission element through the resistance adjustment module, and the light emission control and driving module is used to provide driving current to the light emission element based on the light emission signal;

[0008] The light-emitting element includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The red sub-pixel is connected to the resistance control module to form a first light-emitting branch. The green sub-pixel is connected to the resistance control module to form a second light-emitting branch. The blue sub-pixel is connected to the resistance control module to form a third light-emitting branch. The light-emitting element is used to emit light under the action of the driving current provided by the light-emitting control and driving module.

[0009] The resistance adjustment module is used to adjust the resistance of at least one light-emitting branch when the brightness is switched, so as to match the light emission response time of each sub-pixel of the light-emitting element, wherein the light-emitting branch includes the first light-emitting branch, the second light-emitting branch and the third light-emitting branch.

[0010] In a second aspect, embodiments of this application provide an electronic device, including: a display panel and a circuit as described in the first aspect above for improving display ghosting and color distortion.

[0011] In this embodiment, a light-emitting control and driving module provides a driving current to the light-emitting element based on the light-emitting signal. The light-emitting element includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, which are respectively connected to a resistance adjustment module to form a first light-emitting branch, a second light-emitting branch, and a third light-emitting branch. The light-emitting element emits light under the action of the driving current. When the brightness is switched, the resistance adjustment module adjusts the resistance value of at least one light-emitting branch to match the light-emitting response time of each sub-pixel of the light-emitting element. This can improve the problem of color ghosting and color shift caused by the mixing of red, green, and blue sub-pixels, avoid the phenomenon of reddish or purplish color shift, and improve the display effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a circuit structure for improving display ghosting and color distortion according to an embodiment of this application;

[0013] Figure 2 This is a schematic diagram of the capacitance characteristics of the sub-pixel light-emitting material provided in an embodiment of this application;

[0014] Figure 3 This is a schematic diagram illustrating the lighting characteristics of the sub-pixel light-emitting material provided in an embodiment of this application;

[0015] Figure 4 This is a schematic diagram of the 8T1C LTPO circuit provided in the embodiments of this application;

[0016] Figure 5 This is provided by the embodiments of this application. Figure 4 The driving timing diagram of the circuit shown;

[0017] Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] The circuit for improving display ghosting and color shift provided in this application embodiment is obtained by improving the pixel driving circuit, thereby achieving the effect of improving display ghosting and color shift. The pixel driving circuit used in this application embodiment can be of various types, including but not limited to: 7T1C LTPS (Low Temperature Polycrystalline Silicon), 7T1C LTPO (Low Temperature Polycrystalline Oxide), 8T1C LTPS, or 8T1C LTPO, etc., and is not specifically limited. The light-emitting element in the above-mentioned pixel driving circuit includes, but is not limited to: OLED (Organic Light Emitting Diode) or AMOLED, etc., and is not specifically limited. The circuit for improving display ghosting and color shift in this application embodiment can be obtained by adding a resistance adjustment module to the pixel driving circuit. The resistance adjustment module can adjust the light emission response time of each sub-pixel of the light-emitting element, thereby improving the problem of color ghosting and color shift caused by the mixing of red, green, and blue sub-pixels, avoiding reddish or purplish tints, and improving the display effect.

[0021] The circuit described above for improving display ghosting and color distortion can be applied to various electronic devices, including but not limited to: smart terminal devices such as mobile phones, watches, or tablets, etc., without specific limitations. The electronic device may include the circuit described above for improving display ghosting and color distortion and a display panel, which may include, but is not limited to: OLED display panels or AMOLED display panels, etc., without specific limitations.

[0022] The circuit and electronic equipment for improving display ghosting and color distortion provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0023] Figure 1 This application illustrates a circuit for improving display ghosting and color distortion according to an embodiment of the present application, such as... Figure 1 As shown, the circuit includes: a light-emitting control and driving module 100, a resistance adjustment module 200, and a light-emitting element 300.

[0024] The light emission control and driving module 100 is connected to the light emission element 300 through the resistance adjustment module 200. The light emission control and driving module 100 is used to provide driving current to the light emission element 300 based on the light emission signal EM.

[0025] The light-emitting element 300 includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The red sub-pixel is connected to the resistance control module 200 to form a first light-emitting branch, the green sub-pixel is connected to the resistance control module 200 to form a second light-emitting branch, and the blue sub-pixel is connected to the resistance control module 200 to form a third light-emitting branch. The light-emitting element 300 is used to emit light under the action of the driving current provided by the light-emitting control and driving module 100.

[0026] The resistance adjustment module 200 is used to adjust the resistance of at least one light-emitting branch when the brightness is switched, so as to match the light emission response time of each sub-pixel of the light-emitting element. The light-emitting branch includes a first light-emitting branch, a second light-emitting branch, and a third light-emitting branch.

[0027] In this embodiment, the light emission signal EM can be generated by GOA (Gate On Array). During one frame of display refresh, GOA generates the light emission signal EM and inputs it to the light emission control and driving module 100 to generate a driving current, thereby driving the light emission element 300 to emit light.

[0028] The brightness switching in the embodiments of this application may include: switching from a low grayscale with lower brightness to a high grayscale with higher brightness, or switching from a high grayscale with higher brightness to a low grayscale with lower brightness, and the specific switching is not limited.

[0029] In this embodiment of the application, the resistance adjustment module 200 can be used to perform at least one of the following:

[0030] 1) When switching brightness, reduce the resistance of the second light-emitting branch to shorten the light-emitting response time of the green sub-pixel.

[0031] This implementation is applicable to scenarios where the parasitic capacitance of the G sub-pixel is large and the charging time is long, i.e., scenarios where the light emission response time of the G sub-pixel is long. In such scenarios, the resulting color after color mixing of the light emitted by each sub-pixel is often reddish, bluish, or purplish. Therefore, by reducing the resistance of the second light-emitting branch, i.e., reducing the resistance of the branch where the G sub-pixel is located, the driving current can be increased, the charging time of the parasitic capacitance of the G sub-pixel can be reduced, and thus the light emission response time of the G sub-pixel can be shortened to match the light emission response times of the R and B sub-pixels.

[0032] 2) When switching brightness, increase the resistance of the first light-emitting branch to extend the light-emitting response time of the red sub-pixel.

[0033] This implementation is applicable to scenarios where the parasitic capacitance of the R sub-pixel is small and the charging time is short, i.e., scenarios where the light emission response time of the R sub-pixel is short. In such scenarios, the resulting color after color mixing of the light emitted by each sub-pixel often appears reddish. Therefore, by increasing the resistance of the first light-emitting branch, i.e., increasing the resistance of the branch containing the R sub-pixel, the driving current can be reduced, the charging time of the parasitic capacitance of the R sub-pixel can be increased, and thus the light emission response time of the R sub-pixel can be increased to match the light emission response times of the G and B sub-pixels.

[0034] 3) When switching brightness, increase the resistance of the third light-emitting branch to extend the light-emitting response time of the blue sub-pixel.

[0035] This implementation is applicable to scenarios where the parasitic capacitance of the B sub-pixel is small and the charging time is short, i.e., scenarios where the light emission response time of the B sub-pixel is short. In such scenarios, the resulting color after color mixing of the light emitted by each sub-pixel often appears bluish. Therefore, by increasing the resistance of the third light-emitting branch, i.e., increasing the resistance of the branch containing the B sub-pixel, the driving current can be reduced, the charging time of the parasitic capacitance of the B sub-pixel can be increased, and thus the light emission response time of the B sub-pixel can be increased to match the light emission response times of the G and R sub-pixels.

[0036] The three scenarios mentioned above can be combined. For example, in scenarios where the parasitic capacitance of both the R and B sub-pixels is small and their charging time is short, the resulting color after color mixing from each sub-pixel may be biased towards red, blue, or purple. Therefore, by increasing the resistance of the branches containing both the R and B sub-pixels, the driving current can be reduced, the charging time of the parasitic capacitance of the R and B sub-pixels can be increased, and thus the light-emitting response time of the R and B sub-pixels can be increased to match the light-emitting response time of the G sub-pixel.

[0037] For example, in scenarios where the parasitic capacitance of the G sub-pixel is large and its charging time is long, while the parasitic capacitance of the R and B sub-pixels is small and their charging times are short, the driving current can be increased by reducing the resistance of the branch containing the G sub-pixel, thereby reducing the charging time of the parasitic capacitance of the G sub-pixel and thus shortening the light-emitting response time of the G sub-pixel. Conversely, the driving current can be reduced by increasing the resistance of the branches containing the R and B sub-pixels, thereby increasing the charging time of the parasitic capacitance of the R and B sub-pixels and thus increasing the light-emitting response time of the R and B sub-pixels. Ultimately, this achieves the effect of matching the light-emitting response times of each sub-pixel in the GRB.

[0038] Figure 2 This is a schematic diagram illustrating the capacitance characteristics of the sub-pixel light-emitting material provided in an embodiment of this application. For example... Figure 2 As shown, the parasitic capacitance of the G sub-pixel is the largest, while the parasitic capacitances of the R and B sub-pixels are relatively small. Therefore, under the same driving current / voltage, the parasitic capacitance charging time of the G sub-pixel is the longest, while the parasitic capacitance charging time of the R and B sub-pixels is relatively short.

[0039] Figure 3 This is a schematic diagram illustrating the lighting characteristics of the sub-pixel light-emitting material provided in an embodiment of this application. For example... Figure 3 As shown, when generating the same driving current / voltage based on the emission signal, the G sub-pixel has the slowest response speed, with an emission response time of approximately 3ms before reaching the target brightness. The R and B sub-pixels have relatively faster response speeds, with emission response times of approximately 1ms before reaching the target brightness.

[0040] Based on the capacitance and illumination characteristics of the sub-pixel light-emitting materials mentioned above, this application embodiment uses a resistance control module to adjust the resistance of at least one light-emitting branch when the brightness is switched, so that the light-emitting response time of each sub-pixel of the light-emitting element is matched. This can improve the problem of color ghosting and color shift caused by the mixing of red, green and blue sub-pixels, avoid the phenomenon of red or purple bias, and improve the display effect.

[0041] In this embodiment, the resistance adjustment module 200 can adjust the resistance of at least one light-emitting branch during the charging time of the parasitic capacitor of the light-emitting element 300, so as to match the light-emitting response time of each sub-pixel of the light-emitting element 300. The charging time of the parasitic capacitor of the light-emitting element 300 refers to the time during which the parasitic capacitor is charged after the light-emitting element 300 ends its non-light-emitting phase and before it begins to emit light during the light-emitting phase.

[0042] During the non-charging period of the parasitic capacitance of the light-emitting element 300, the resistance adjustment module 200 can reduce the resistance of at least one light-emitting branch to a first voltage value, thereby increasing the driving current to a second current value. The first voltage value can be a minimum voltage value, and the second current value can be a maximum current value. The non-charging period of the parasitic capacitance includes the non-light-emitting phase of the light-emitting element 300, and the phase from the completion of parasitic capacitance charging to the end of light emission within the light-emitting phase. This method of increasing the driving current to a second current value (such as the maximum current value) during the non-charging period of the parasitic capacitance reduces the current impact on the light-emitting element due to connection resistance, minimizing the impact on display effects and ensuring the quality of the displayed content.

[0043] In one implementation, the resistance adjustment module 200 is used to adjust the resistance of at least one light-emitting branch when the brightness is switched, so that the error between the light-emitting response times of each sub-pixel of the light-emitting element 300 is less than a threshold.

[0044] The threshold values ​​mentioned above can be set as needed, and the specific values ​​are not limited. If the error between the light emission response times of each sub-pixel is less than the threshold, it means that the light emission response times of each sub-pixel are relatively close, and therefore can be regarded as matching of the light emission response times of each sub-pixel.

[0045] For example, the resistance adjustment module 200 is used to adjust the resistance of at least one light-emitting branch when the brightness is switched so that the light-emitting response time of each sub-pixel of the light-emitting element 300 is the same.

[0046] In scenarios where the light-emitting response time of each sub-pixel is the same, the red, green, and blue sub-pixels can complete the parasitic capacitance charging process within the same time and start emitting light at the same moment. This achieves the problem of color fading or color cast after color mixing, avoiding the phenomenon of reddish or purplish tint and improving the display effect.

[0047] In this embodiment of the application, the resistance control module 200 may include at least one of the following: a resistance control unit for red sub-pixels, a resistance control unit for green sub-pixels, and a resistance control unit for blue sub-pixels.

[0048] Among them, the resistance control unit of the red sub-pixel is connected to the red sub-pixel to form the first light-emitting branch, the resistance control unit of the green sub-pixel is connected to the green sub-pixel to form the second light-emitting branch, and the resistance control unit of the blue sub-pixel is connected to the blue sub-pixel to form the third light-emitting branch.

[0049] The resistance control unit of any one of the above-mentioned red sub-pixel resistance control units, green sub-pixel resistance control units, and blue sub-pixel resistance control units may include:

[0050] There are N resistors and N switches connected in parallel. Each resistor is connected in series with a switch. Each switch is used to control the switching on and off of the resistor connected in series with it when the brightness is switched. N is a positive integer.

[0051] In this process, the resistance control unit of any of the above sub-pixels determines the resistance value of the corresponding light-emitting branch by controlling the number of connected resistors through N switches, so that the light-emitting response time of any sub-pixel matches the light-emitting response time of other sub-pixels.

[0052] The resistance values ​​of the N resistors can be the same or different, and there is no specific limitation. For example, the resistance value of all N resistors can be R1, or the resistance values ​​of the N resistors can be R1, R2, ..., RN in sequence.

[0053] In this embodiment of the application, the circuit for improving display ghosting and color distortion can be any of the following types: 7T1CLTPS, 7T1CLTPO, 8T1C LTPS, 8T1C LTPO, and the specific type is not limited. The circuit for improving display ghosting and color distortion is described below using the 8T1C LTPO type as an example.

[0054] Figure 4 This is a schematic diagram of the 8T1C LTPO circuit provided in an embodiment of this application. For example... Figure 4 As shown, the circuit for improving display ghosting and color distortion includes eight TFTs (T1~T8), one capacitor Cst, and one OLED. T1, T2, T5, T6, T7, and T8 are all P-type TFTs, which are on when the voltage level is low and off when the voltage level is high. T3 and T4 are N-type TFTs, which are off when the voltage level is low and on when the voltage level is high.

[0055] Figure 4T5, T1, and T6 in the diagram form the light-emitting control and driving module 100, which provides driving current to the light-emitting element 300 based on the light-emitting signal EM. The light-emitting element 300 is specifically an OLED, which emits light under the driving current provided by the light-emitting control and driving module 100. Each of the first, second, and third light-emitting branches includes N switches and N resistors, as shown in the diagram, where N is a positive integer. The N switches are: W1, W2, W3, W4, ..., WN. The N resistors are: R1, R2, R3, R4, ..., RN. Each switch is connected in series with a resistor, and then they are connected in parallel. The resistance values ​​of the N resistors can be the same or different, and are not specifically limited. When the resistance values ​​of the N resistors are all different, the total resistance of the N resistors connected in parallel is R0 = 1 / (1 / R1 + 1 / R2 + 1 / R3 + 1 / R4 + ... + 1 / RN). When N resistors have the same resistance value, such as R1, the total resistance of the N resistors connected in parallel is R0 = R1 / N. In different scenarios, some or all of the N resistors can be connected in parallel. The number of resistors connected in parallel is determined by N switches, thus obtaining different total resistance values, i.e., the resistance values ​​of the respective branches. When brightness is switched, the resistance adjustment module 200 can match the light emission response time of each sub-pixel by adjusting the resistance value of at least one light-emitting branch.

[0056] For example, in the scenario where the R sub-pixel's light-emitting response time is shortest, the resistance adjustment module 200 can reduce the driving current by increasing the resistance of the first light-emitting branch, such as by selectively disconnecting more resistors via a switch. Since fewer parallel resistors result in a larger total parallel resistance, which is the resistance of the first light-emitting branch where the R sub-pixel is located, disconnecting more resistors increases the resistance of the first light-emitting branch, lengthens the charging time of the parasitic capacitor, and thus increases the light-emitting response time of the R sub-pixel to match the light-emitting response times of the G and B sub-pixels.

[0057] For example, in scenarios where the G sub-pixel has the longest light-emitting response time, the resistance adjustment module 200 can increase the driving current by reducing the resistance of the second light-emitting branch, such as by selecting to connect more resistors via a switch. Since the more resistors connected in parallel, the smaller the total resistance after parallel connection, and this total resistance is the resistance of the second light-emitting branch where the G sub-pixel is located, connecting more resistors reduces the resistance of the second light-emitting branch, shortens the charging time of the parasitic capacitance, and thus shortens the light-emitting response time of the G sub-pixel to match the light-emitting response times of the R and B sub-pixels.

[0058] In this embodiment, the driving timing process of the circuit for improving display ghosting and color distortion within one frame of display refresh can include multiple stages, specifically related to the display refresh frequency and the frequency of light-emitting element reset and drive bias compensation. If the display refresh frequency is the same as the frequency of light-emitting element reset and drive bias compensation, the driving timing process can include four stages: stages t1 to t4. If the display refresh frequency is less than the frequency of light-emitting element reset and drive bias compensation, the driving timing process can include five stages: stages t1 to t4 and a repetition stage.

[0059] Figure 5 This is provided by the embodiments of this application. Figure 4 The driving timing diagram of the circuit shown is as follows. Figure 5 As shown, the circuit for improving display ghosting and color distortion has a display refresh rate of 120Hz, and a light-emitting element reset and drive bias compensation frequency of 360Hz. Pscan1 is the gate control signal for T7 and T8, Pscan2 is the gate control signal for T2, Nscan1 is the gate control signal for T3, Nscan2 is the gate control signal for T4, and EM is the light-emitting signal, which is also the gate control signal for T5 and T6. Combined with... Figure 4 and Figure 5 The driving timing process of the circuit described above for improving display ghosting and color distortion can include the following 5 stages.

[0060] (1) t1 stage (capacitor reset stage): The gate control signal Nscan2 of T4 is high, the gate control signal Pscan1 of T7 and T8 is high, the gate control signal Pscan2 of T2 is high, the gate control signal Nscan1 of T3 is low, T4 is turned on, the initialization voltage Vint1 (negative voltage) is written to the gate A point of T1 and stored in the capacitor Cst for retention.

[0061] (2) t2 stage (data writing and threshold voltage compensation stage): The gate control signal Nscan1 of T3 is high, the gate control signal Pscan1 of T7 and T8 is high, the gate control signal Pscan2 of T2 is low, and the gate control signal Nscan2 of T4 is low. T2 and T3 are turned on, the gate and drain of T1 are shorted, and the potential at point A is |VA|>|Vth|. T1 is turned on, and the display data voltage signal DATA is transmitted along T2, T1, and T3, and finally stored in capacitor Cst until the potential at point A becomes Vdata-|Vth|, at which point T1 is turned off. Wherein, Vdata is the input display data voltage, and Vth is the threshold voltage of T1 itself. Through this operation, the threshold voltage Vth of T1 is extracted, compensating for the threshold voltage of T1.

[0062] (3) t3 stage (OLED reset and drive bias compensation stage): The gate control signal Pscan1 of T7 is low, the gate control signal Nscan1 of T3 is low, the gate control signal Nscan2 of T4 is low, and the gate control signal Pscan2 of T2 is high. T7 is turned on. At this time, the anode of the OLED is connected to Vint2 and the cathode is connected to the negative voltage ELVSS. The reset voltage Vint2 (negative voltage) is written to the anode of the OLED to reset the OLED and release the residual charge accumulated in the OLED. At this time, the anode potential of the OLED is the Vint2 voltage. The gate control signal Pscan1 of T8 is low, and T8 is also turned on. The source of T1 is connected to the bias compensation voltage Vint3 to perform bias compensation on T1.

[0063] The t1 to t3 stages mentioned above are the stages during which the OLED does not emit light.

[0064] (4) t4 stage (light emission stage): The gate control signal EM (light emission signal) of T5 and T6 is low, the gate control signal Nscan1 of T3 is low, the gate control signal Nscan2 of T4 is low, the gate control signal Pscan1 of T7 and T8 is high, the gate control signal Pscan2 of T2 is high, T5 and T6 are turned on, and at this time, the gate of T1 is also in the open state under the action of the storage voltage Vdata-|Vth| at point A of Cst capacitor. The driving current flows from the positive voltage ELVDD through T5, T1, T6 and OLED to the negative voltage ELVSS, and the OLED emits light.

[0065] Among them, ELVDD is a constant positive voltage, usually 4.6V, and ELVSS is an adjustable negative voltage output by the power supply chip controlled by the display driver chip.

[0066] The t4 stage mentioned above is the stage where the OLED emits light.

[0067] (5) Repetition phase: Since the frequency of light-emitting element reset and drive bias compensation is 360Hz, the gate control signals Pscan1 of T7 and T8 and the gate control signals EM of T5 and T6 are repeated 3 times in the time frame (120Hz) of display refresh.

[0068] In this embodiment, during the non-charging time of the parasitic capacitance of the light-emitting element, the resistance control unit of any sub-pixel in the resistance control module 200 closes N switches to connect N resistors in parallel to the corresponding sub-pixel, thereby reducing the resistance of the branch to a first voltage value and increasing the driving current to a second current value. With N switches closed, the first voltage value can reach its minimum value, and the second current value can reach its maximum value.

[0069] in, Figure 5 Within a 120Hz frame, the timing of the red sub-pixel of the light-emitting element (row Rr) is as follows: the three high-level phases correspond to the charging time of the parasitic capacitance of the red sub-pixel, and the resistance connected to the red sub-pixel during this phase is Rr1; all other low-level phases correspond to the non-charging time of the parasitic capacitance of the red sub-pixel, and the resistance connected to the red sub-pixel during this phase is the minimum value, such as Rn=R1 / N, that is, the resistance of N resistors with a resistance of R1 connected in parallel is Rn, and the driving current of the OLED is the maximum at this time.

[0070] in, Figure 5 In the 120Hz frame shown, the timing of the green sub-pixels of the light-emitting element (row Rg) is as follows: the three high-level phases correspond to the charging time of the parasitic capacitance of the green sub-pixels, and the resistance of the second light-emitting branch where the green sub-pixels are located during this phase is Rg1; all other low-level phases correspond to the non-charging time of the parasitic capacitance of the green sub-pixels, and the resistance of the second light-emitting branch where the green sub-pixels are located during this phase is the minimum value, such as Rn=R1 / N, that is, the resistance of N resistors with a resistance of R1 connected in parallel is Rn, and the driving current of the OLED is the maximum at this time.

[0071] in, Figure 5 Within a 120Hz frame, the timing of the blue sub-pixels of the light-emitting element (row Rb) shows: the three high-level phases correspond to the charging time of the parasitic capacitance of the blue sub-pixels, and the resistance of the third light-emitting branch where the blue sub-pixels are located during this phase is Rb1; all other low-level phases correspond to the non-charging time of the parasitic capacitance of the blue sub-pixels, and the resistance of the third light-emitting branch where the blue sub-pixels are located during this phase is the minimum value, such as Rn=R1 / N, that is, the resistance of N resistors with a resistance of R1 connected in parallel is Rn, and the driving current of the OLED is the maximum at this time.

[0072] The circuit for improving display ghosting and color shift provided in this application embodiment provides driving current to the light-emitting element based on the light-emitting signal through the light-emitting control and driving module. The light-emitting element includes red sub-pixels, green sub-pixels, and blue sub-pixels, which are respectively connected to the resistance adjustment module to form a first light-emitting branch, a second light-emitting branch, and a third light-emitting branch. The light-emitting element emits light under the action of the driving current. When the brightness is switched, the resistance adjustment module adjusts the resistance value of at least one light-emitting branch to match the light-emitting response time of each sub-pixel of the light-emitting element. This can improve the problem of color ghosting and color shift caused by the mixing of red, green, and blue sub-pixels, avoid the phenomenon of reddish or purple color shift, and improve the display effect.

[0073] In addition, increasing the driving current to a second current value (such as the maximum current value) during the non-charging time of the parasitic capacitance of any sub-pixel can reduce the current influence on the light-emitting element due to the connection resistance, reduce the impact on the display effect, and ensure the quality of the displayed content.

[0074] Figure 6 An electronic device provided in an embodiment of this application is shown, such as... Figure 6 As shown, the electronic device 600 includes a display panel 601 and a circuit 602 for improving display ghosting and color distortion as described in any of the above embodiments. The circuit for improving display ghosting and color distortion has the same function as described in the above embodiments and achieves the same technical effect, and will not be repeated here.

[0075] The electronic device provided in this application embodiment can improve the problem of color trailing and color deviation caused by the mixing of red, green and blue sub-pixels, avoid the phenomenon of reddish or purple color deviation, and improve the display effect.

[0076] It should be noted that the electronic devices in the embodiments of this application include mobile electronic devices and non-mobile electronic devices.

[0077] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0078] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0079] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A circuit for improving display ghosting and color distortion, characterized in that, include: Light emission control and driving module, resistance adjustment module, and light emission element; The light emission control and driving module is connected to the light emission element through the resistance adjustment module, and the light emission control and driving module is used to provide driving current to the light emission element based on the light emission signal; The light-emitting element includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The red sub-pixel is connected to the resistance control module to form a first light-emitting branch. The green sub-pixel is connected to the resistance control module to form a second light-emitting branch. The blue sub-pixel is connected to the resistance control module to form a third light-emitting branch. The light-emitting element is used to emit light under the action of the driving current provided by the light-emitting control and driving module. The resistance adjustment module is used to adjust the resistance of at least one light-emitting branch when the brightness is switched, so as to match the light emission response time of each sub-pixel of the light-emitting element, wherein the light-emitting branch includes the first light-emitting branch, the second light-emitting branch and the third light-emitting branch.

2. The circuit according to claim 1, characterized in that, The resistance control module is used to perform at least one of the following: When switching brightness, the resistance of the second light-emitting branch is reduced to shorten the light-emitting response time of the green sub-pixel. When the brightness is switched, the resistance of the first light-emitting branch is increased to extend the light-emitting response time of the red sub-pixel. When switching brightness, the resistance of the third light-emitting branch is increased to extend the light-emitting response time of the blue sub-pixel.

3. The circuit according to claim 1, characterized in that, The resistance adjustment module adjusts the resistance of at least one light-emitting branch during the charging time of the parasitic capacitance of the light-emitting element, so as to match the light-emitting response time of each sub-pixel of the light-emitting element. During the non-charging time of the parasitic capacitance of the light-emitting element, the resistance control module reduces the resistance of at least one light-emitting branch to a first voltage value, so as to increase the driving current to a second current value.

4. The circuit according to any one of claims 1-3, characterized in that, The resistance control module is used to adjust the resistance of at least one light-emitting branch when the brightness is switched, so that the error between the light-emitting response times of each sub-pixel of the light-emitting element is less than a threshold.

5. The circuit according to claim 4, characterized in that, The resistance adjustment module is used to adjust the resistance of at least one light-emitting branch when the brightness is switched, so that the light-emitting response time of each sub-pixel of the light-emitting element is the same.

6. The circuit according to claim 1, characterized in that, The resistance control module includes at least one of the following: a resistance control unit for red sub-pixels, a resistance control unit for green sub-pixels, and a resistance control unit for blue sub-pixels. Wherein, the resistance control unit of the red sub-pixel is connected to the red sub-pixel to form the first light-emitting branch, the resistance control unit of the green sub-pixel is connected to the green sub-pixel to form the second light-emitting branch, and the resistance control unit of the blue sub-pixel is connected to the blue sub-pixel to form the third light-emitting branch; The resistance control unit of any sub-pixel includes: N parallel resistors and N parallel switches, each resistor is connected in series with a switch, and each switch is used to control the switching off and connecting of the resistor connected in series with it when the brightness is switched, where N is a positive integer. The resistance control unit of any sub-pixel determines the resistance value of the corresponding light-emitting branch by controlling the number of resistors connected by the N switches, so that the light-emitting response time of any sub-pixel matches the light-emitting response time of other sub-pixels.

7. The circuit according to claim 6, characterized in that, The resistance values ​​of the N resistors may be the same or different.

8. The circuit according to claim 6, characterized in that, During the non-charging time of the parasitic capacitance of the light-emitting element, the resistance adjustment unit of any sub-pixel closes the N switches to connect the N resistors in parallel and then in series with the corresponding sub-pixel, so that the resistance of the corresponding light-emitting branch is reduced to the first voltage value and the driving current is increased to the second current value.

9. The circuit according to any one of claims 1-3, characterized in that, The circuit is of any of the following types: 7T1C low temperature polycrystalline silicon LTPS, 7T1C low temperature polycrystalline oxide LTPO, 8T1C LTPS, or 8T1C LTPO.

10. An electronic device, characterized in that, include: The display panel and the circuit for improving display ghosting and color distortion as claimed in any one of claims 1-9.

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