Circuits, electronic devices and methods for improving color distortion in displays

Abstract

This application discloses a circuit, electronic device, and method for improving color cast in displays, belonging to the field of display technology. The circuit includes: a driving and control module, used to provide a driving current to a light-emitting element based on a light-emitting signal, and to adjust the driving current based on a pixel driving control signal to adjust the light-emitting brightness of a corresponding pixel of the light-emitting element; a light-emitting element, connected to the driving and control module, used to emit light under the action of the driving current provided by the driving and control module; wherein, the pixel driving control signal indicates that the display is in a color cast state.

Description

Technical Field

[0001] This application belongs to the field of display technology, and specifically relates to a circuit, electronic device and method for improving display 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. The pixel driving circuit of AMOLED typically consists of multiple TFTs (Thin Film Transistors).

[0003] TFT devices typically age after prolonged use or in high-temperature and high-humidity environments, leading to an increase in the current driving the TFT and consequently, a higher brightness of the light-emitting diode (LED). Among LEDs, the G (green) pixel material has the highest luminous efficiency, while the R (red) and B (blue) pixel materials have relatively lower luminous efficiency. Therefore, under the same current increase, the green pixel material results in the greatest increase in brightness, while the red and blue pixel materials show less increase. This ultimately leads to a higher proportion of green light after the red, green, and blue pixels mix, causing a color shift in the screen display, resulting in an overall green tint. Summary of the Invention

[0004] The purpose of this application is to provide a circuit, electronic device, and method for improving display color distortion, which can solve the problem of screen display color distortion in related technologies.

[0005] In a first aspect, embodiments of this application provide a circuit for improving color distortion in displays, comprising:

[0006] The driving and control module is used to provide driving current to the light-emitting element based on the light emission signal (EM[n]) and adjust the driving current based on the pixel driving control signal (Scan[n]) to adjust the light emission brightness of the corresponding pixel of the light-emitting element;

[0007] The light-emitting element is connected to the driving and control module and is used to emit light under the action of the driving current provided by the driving and control module.

[0008] The pixel drive control signal (Scan[n]) represents the state of color cast.

[0009] In a second aspect, embodiments of this application provide an electronic device, including: a display panel and a circuit for improving display color distortion as described in the first aspect above.

[0010] Thirdly, embodiments of this application provide a method for improving display color cast, applied to the circuit for improving display color cast as described in the first aspect above, the method comprising:

[0011] Detect the current temperature or display the cumulative display time;

[0012] The driving and control module provides driving current to the light-emitting element based on the light-emitting signal (EM[n]), so that the light-emitting element emits light;

[0013] The driving and control module adjusts the driving current based on the pixel driving control signal (Scan[n]) to adjust the luminous brightness of the corresponding pixel of the light-emitting element.

[0014] Fourthly, embodiments of this application provide an electronic device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method for improving display color distortion as described in the third aspect.

[0015] Fifthly, embodiments of this application provide a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the method for improving display color distortion as described in the third aspect.

[0016] In a sixth aspect, embodiments of this application provide a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement the method for improving display color distortion as described in the third aspect.

[0017] In a seventh aspect, embodiments of this application provide a computer program product stored in a storage medium, which is executed by at least one processor to implement the method for improving display color distortion as described in the third aspect.

[0018] In this embodiment, the driving and control module provides a driving current to the light-emitting element based on the light-emitting signal. The light-emitting element emits light under the action of the driving current. The driving and control module adjusts the driving current based on the pixel driving control signal that represents the color deviation state of the display. This can adjust the light emission brightness of the corresponding pixel of the light-emitting element, thereby improving the color deviation problem and enhancing the display effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the 7T1C LTPS pixel driving circuit in related technologies;

[0020] Figure 2 This is a timing diagram of the 7T1C LTPS pixel driving circuit in related technologies;

[0021] Figure 3 This is a comparative diagram of the performance of OLEDs after long-term use in related technologies;

[0022] Figure 4 This is a schematic diagram of a circuit structure for improving color distortion in displays, provided in an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0025] Figure 7 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0026] Figure 8 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0027] Figure 9 This is provided by the embodiments of this application. Figure 8 The driving timing diagram of the circuit shown;

[0028] Figure 10 This is a schematic diagram of the transfer characteristic curve of a P-type transistor provided in an embodiment of this application;

[0029] Figure 11 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0030] Figure 12 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0031] Figure 13 This is provided by the embodiments of this application. Figure 12 The driving timing diagram of the circuit shown;

[0032] Figure 14 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0033] Figure 15 This is a schematic diagram of another circuit structure for improving color distortion in displays provided in this application embodiment;

[0034] Figure 16 This is a schematic diagram of the pixel driving control signal generated by GOA according to an embodiment of this application;

[0035] Figure 17 This is a schematic flowchart of a method for improving color distortion in displays provided in an embodiment of this application;

[0036] Figure 18 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] To better understand the technical solutions provided in this application, some concepts and / or terms involved in this application will be explained first.

[0040] The circuit for improving color cast provided in this application embodiment is obtained by improving the pixel driving circuit, which can achieve the effect of improving color cast. 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.

[0041] The working principle of the pixel driving circuit is introduced below using the 7T1C LTPS type as an example. Figure 1 The diagram shows the structure of the 7T1C LTPS pixel driving circuit. Figure 1As shown, the pixel driving circuit includes seven TFTs (T1~T7), one capacitor Cst, and one OLED (Organic Light Emitting Diode). The seven TFTs can be P-type or N-type; the diagram illustrates P-type TFTs, which are in the on state when the voltage level is low and in the off state when the voltage level is high. During one frame of display refresh, the driving timing process of the pixel driving circuit can include the following four stages, combined with… Figure 2 The timing diagrams are explained in detail.

[0042] (1) t1 stage (capacitor reset stage): The gate scan signal Scan[n-1] of the n-1th row is low, T4 is turned on, the first voltage Vint1 (negative voltage) is written to the gate of T1 and stored in the capacitor Cst for retention.

[0043] (2) t2 stage (data writing and threshold voltage compensation stage): The gate scan signal Scan[n] of the nth row is low, T2 and T3 are turned on, and T1 is also turned on under the negative voltage Vint1 of capacitor Cst. The data voltage signal DATA is transmitted along T2, T1 and T3 and is finally stored in capacitor Cst until the voltage on capacitor Cst becomes Vdata-|Vth|, at which point T1 is turned off. Wherein, Vdata is the input data voltage and Vth is the threshold voltage of T1 itself. Through this operation, the threshold voltage Vth of T1 is extracted and the voltage of T1 is compensated.

[0044] (3) t3 stage (OLED reset stage): The gate scan signal Scan[n+1] of the n+1th row is low, T7 is turned on, and the second 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.

[0045] (4) t4 stage (light emission stage): The gate scan signals Scan[n-1], Scan[n], and Scan[n+1] are all high, T2, T3, T4, and T7 are turned off, the nth row light emission control gate scan signal EM[n] is low, and T5 and T6 are turned on. At this time, the gate of T1 is in the open state under the action of the storage voltage Vdata-|Vth| of capacitor Cst. The current flows from the positive power supply voltage ELVDD through T5, T1, and T6, and then flows to the negative power supply voltage ELVSS of the OLED, and the OLED emits light. 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.

[0046] Figure 3This diagram illustrates the performance comparison of OLEDs after prolonged use. Initially, the green pixel material in the OLED exhibits the highest luminous efficiency, while the red and blue pixel materials have relatively lower luminous efficiency. To prevent color shift after the red, green, and blue pixels mix, the pixel design typically minimizes the luminous area and data voltage (Vdata) of the green (G) light source; conversely, it maximizes the luminous areas and data voltages (Vdata) of the red (R) and blue (B) light sources. This design matches the data voltage (Vdata) with the luminous area, ensuring a matching brightness among the green (G), red (R), and blue (B) light sources, resulting in white light without color shift after mixing.

[0047] However, after prolonged use or operation in high-temperature and high-humidity environments, the TFT devices age, resulting in increased current flowing through the driving transistor T1 at the same data voltage Vdata. This leads to higher OLED brightness; for example, the brightness of green light (G) increases from 120 nits to 360 nits, a greater increase than that of red (R) and blue (B). Consequently, the brightness of the red, green, and blue pixels becomes mismatched, causing a color cast and an overall green tint to the screen display.

[0048] In view of this, embodiments of this application provide a circuit, electronic device, and method for improving display color shift. A current regulation module controls and reduces the current of the light-emitting element to overcome the color shift problem caused by increased current. The current regulation module can be implemented using a TFT. For example, adding a T8 as a current regulation module to a 7T1C LTPS pixel driving circuit transforms it into an 8T1C LTPS circuit for improving display color shift; or, modifying one of the light-emitting control transistors in the 7T1C LTPS pixel driving circuit into a current regulation module transforms it into a 7T1C LTPS circuit for improving display color shift. Similarly, adding a T9 as a current regulation module to an 8T1C LTPO pixel driving circuit transforms it into a 9T1C LTPO circuit for improving display color shift, etc. The embodiments of this invention do not specifically limit the specific applications. The light-emitting element includes, but is not limited to, OLED or AMOLED, etc., and is not specifically limited to any particular type.

[0049] The aforementioned circuit for improving display 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 aforementioned circuit for improving display color distortion and a display panel, which may include, but is not limited to: OLED display panels or AMOLED display panels, etc.

[0050] The circuits, electronic devices, and methods for improving display color distortion provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0051] Figure 4 This application illustrates a circuit for improving display color distortion according to an embodiment of the present application, such as... Figure 4 As shown, the circuit includes a driving and control module 100 and a light-emitting element 200.

[0052] The driving and control module 100 is used to provide driving current to the light-emitting element 200 based on the light emission signal EM[n] and adjust the driving current based on the pixel driving control signal Scan[n] to adjust the light emission brightness of the corresponding pixel of the light-emitting element 200.

[0053] The light-emitting element 200 is connected to the driving and control module 100 and is used to emit light under the action of the driving current provided by the driving and control module 100.

[0054] Among them, the pixel drive control signal Scan[n] represents the state of color deviation displayed.

[0055] In this embodiment, the light-emitting signal EM[n] can be generated by the GOA (Gate On Array). During one frame of display refresh, the GOA generates the light-emitting signal EM[n] in the t4 stage (light-emitting stage) to drive the light-emitting element 200 to emit light.

[0056] The GOA can be located on the left side of the screen, or on the right side of the screen, or on both the left and right sides of the screen respectively. This application does not specifically limit this.

[0057] In this embodiment, the driving process of the circuit for improving color distortion includes a reset data writing compensation stage and an emission stage. Accordingly, the pixel driving control signal Scan[n] may include at least one of the following:

[0058] 1) Green sub-pixel drive control signal ScanG[n], wherein the voltage of the green sub-pixel drive control signal ScanG[n] during the light emission stage is lower than the voltage during the reset data write compensation stage.

[0059] In this scenario, the green sub-pixels produce a color cast, meaning the color becomes greener after color mixing. In this case, the driving current is reduced during the light-emitting stage by using the green sub-pixel driving control signal ScanG[n], thereby reducing the light-emitting brightness of the 200 green pixels of the light-emitting element and improving the greenish display.

[0060] 2) Red sub-pixel drive control signal ScanR[n], wherein the voltage of the red sub-pixel drive control signal ScanR[n] during the light emission stage is lower than the voltage during the reset data write compensation stage.

[0061] In this scenario, the red sub-pixel produces a color cast, meaning the color becomes redder after color mixing. In this case, the red sub-pixel drive control signal ScanR[n] reduces the drive current during the light emission stage, thereby reducing the light emission brightness of the 200 red pixels of the light-emitting element and improving the reddish display.

[0062] 3) Blue sub-pixel drive control signal ScanB[n], wherein the voltage of the blue sub-pixel drive control signal ScanB[n] during the light emission stage is lower than the voltage during the reset data write compensation stage.

[0063] In this scenario, the blue sub-pixel produces a color cast, meaning the color becomes more bluish after color mixing. In this case, the blue sub-pixel drive control signal ScanB[n] reduces the drive current during the light emission stage, thereby reducing the light emission brightness of the 200 blue pixels of the light-emitting element and improving the bluish display.

[0064] The three scenarios mentioned above can be combined. The green sub-pixel driving control signal ScanG[n], the red sub-pixel driving control signal ScanR[n], and the blue sub-pixel driving control signal ScanB[n] can be used in combination to overcome the problem of color distortion in the display.

[0065] For example, if the display is both green and red, the green sub-pixel drive control signal ScanG[n] and the red sub-pixel drive control signal ScanR[n] are used simultaneously to reduce the drive current, thereby reducing the luminous brightness of the green and red pixels of the light-emitting element 200.

[0066] For example, if the display is both green and blue, the green sub-pixel drive control signal ScanG[n] and the blue sub-pixel drive control signal ScanB[n] are used simultaneously to reduce the drive current, thereby reducing the luminous brightness of the green and blue pixels of the light-emitting element 200.

[0067] For example, if the display is simultaneously biased towards green, red, and blue, the green sub-pixel drive control signal ScanG[n], the red sub-pixel drive control signal ScanR[n], and the blue sub-pixel drive control signal ScanB[n] are used simultaneously to reduce the drive current, thereby reducing the luminous brightness of the green, red, and blue pixels of the light-emitting element 200.

[0068] In this embodiment, the degree of color shift of the red, green, and blue sub-pixels may be different. If the degree of color shift of the first sub-pixel is higher than that of the second sub-pixel, then during the light emission stage, the voltage drop of the first sub-pixel driving control signal is greater than the voltage drop of the second sub-pixel driving control signal, thereby allowing the light emission brightness of the two sub-pixels to match. The first sub-pixel can be any one of the green, red, and blue sub-pixels, and the second sub-pixel can be any one of the green, red, and blue sub-pixels; the two are sub-pixels of different colors.

[0069] For example, if the display is both green and red, but the green sub-pixels are more biased, meaning the overall color is more green, then the green sub-pixel drive control signal ScanG[n] and the red sub-pixel drive control signal ScanR[n] can be used simultaneously to reduce the drive current. From the reset data writing compensation stage to the light emission stage, during the light emission stage, the voltage of the green sub-pixel drive control signal decreases from a low level of -10V to -5V, and the voltage of the red sub-pixel drive control signal decreases from a low level of -10V to -8V, thereby reducing the brightness of the green and red sub-pixels of the light-emitting element 200, with a greater reduction in the brightness of the green sub-pixels, thus matching the brightness of the green and red sub-pixels.

[0070] See Figure 5 and Figure 6 In this embodiment of the application, the driving and control module 100 may include: a light emission control and driving unit 10 and a current control unit 20.

[0071] The light emission control and driving unit 10 and the current regulation unit 20 are connected in series. One end of the light emission control and driving unit 10 is connected to the light emission signal EM[n], and one end of the current regulation unit 20 is connected to the pixel driving control signal Scan[n].

[0072] The light emission control and driving unit 10 is used to provide driving current to the light emission element 200 based on the light emission signal EM[n]. The current regulation unit 20 is used to adjust the driving current based on the pixel driving control signal Scan[n] to adjust the light emission brightness of the corresponding pixel of the light emission element 200.

[0073] Among them, such as Figure 5 As shown, one end of the current regulation unit 20 is connected to the light-emitting element 200. Alternatively, as... Figure 6 As shown, one end of the light-emitting control and driving unit 10 is connected to the light-emitting element 200.

[0074] See Figure 5 One end of the current regulation unit 20 is connected to the light-emitting element 200. The circuit provided in the embodiments of this application may further include: a light-emitting element reset module 300.

[0075] One end of the light-emitting element reset module 300 is connected to the second voltage Vint2, and the other end is connected to the first node D1. The first node D1 is the connection node between the light-emitting control and driving unit 10 and the current regulation unit 20. The light-emitting element reset module 300 is used to reset the light-emitting element 200 based on the second voltage Vint2.

[0076] See Figure 6One end of the light-emitting control and driving unit 10 is connected to the light-emitting element 200. The circuit provided in the embodiments of this application may further include: a light-emitting element reset module 300.

[0077] One end of the light-emitting element reset module 300 is connected to the second voltage Vint2, and the other end is connected to the second node D2. The second node D2 is the connection node between the light-emitting control and drive unit 10 and the light-emitting element 200. The light-emitting element reset module 300 is used to reset the light-emitting element 200 based on the second voltage Vint2.

[0078] The circuit provided in this application embodiment provides a driving current to the light-emitting element based on the light-emitting signal through the driving and control module. The light-emitting element emits light under the action of the driving current. The driving and control module adjusts the driving current based on the pixel driving control signal that represents the color deviation state of the display. This can adjust the light emission brightness of the corresponding pixel of the light-emitting element, thereby improving the problem of color deviation and improving the display effect.

[0079] Figure 7 This application illustrates another circuit for improving display color cast, using the addition of a first current regulation unit to the pixel driving circuit as an example. Figure 7 As shown, the circuit includes a driving and control module 100 and a light-emitting element 200. The driving and control module 100 includes a first light-emitting control unit 11, a driving unit 12, a second light-emitting control unit 13, and a first current control unit 21 connected in series.

[0080] The first light-emitting control unit 11 and the second light-emitting control unit 13 are both connected to the light-emitting signal EM[n], and both are in the on state when the light-emitting signal EM[n] is at the first level.

[0081] In this embodiment, the first level can be either high or low, determined by the type of TFT used in the first light-emitting control unit 11. For example, if the first light-emitting control unit 11 uses a P-type TFT, the first level is low, meaning it is in an on state when low and in an off state when high. Similarly, if the first light-emitting control unit 11 uses an N-type TFT, the first level is high, meaning it is in an on state when high and in an off state when low.

[0082] The driving unit 12 is in the open state when the data voltage is greater than the threshold voltage of the driving unit 12.

[0083] The first current regulation unit 21 is always in the open state during the driving process of the above circuit. One end is connected to the pixel driving control signal Scan[n], and the other end is connected to the light-emitting element 200.

[0084] When the first light-emitting control unit 11, the driving unit 12, the second light-emitting control unit 13, and the first current regulation unit 21 are all in the open state, driving current is provided to the light-emitting element 200.

[0085] The first current regulation unit 21 is used to adjust (e.g., reduce) the driving current based on the pixel driving control signal Scan[n], so as to adjust (e.g., reduce) the luminous brightness of the corresponding pixel of the light-emitting element 200.

[0086] In this embodiment of the application, the circuit may further include:

[0087] The light-emitting element reset module 300 is connected at one end to the second voltage Vint2 and at the other end to the first node D1. It is used to reset the light-emitting element 200 based on the second voltage Vint2 when the first current regulation unit 21 is in the open state. The first node D1 is the connection node between the second light-emitting control unit 13 and the first current regulation unit 21.

[0088] The following is combined Figure 7 and Figure 8 Detailed description Figure 5 The specific application scenario of the circuit shown is illustrated using the example of adding a first current regulation unit to the 7T1C LTPS pixel driving circuit. Figure 7 The functions of each module were demonstrated. Figure 8 The connections between the various components are shown. For example... Figure 8 As shown, T5 and T6 are the first and second light-emitting control units, respectively, and both are connected to the light-emitting signal EM[n]. T1 is a driving unit. The newly added T8 is the first current regulation unit. The gate of T8 is connected to the pixel driving control signal Scan[n], including: the red sub-pixel driving control signal ScanR[n], the green sub-pixel driving control signal ScanG[n], and the blue sub-pixel driving control signal ScanB[n]. The source of T8 is connected to T6, i.e., the second light-emitting control unit, and the drain of T8 is connected to the light-emitting element OLED. T7 is the light-emitting element reset module, with its source connected to the second voltage Vint2 and its drain connected to the connection node between T6 and T8. In the event of color shift due to the increased current flowing through the driving unit T1, the pixel driving control signal Scan[n] is generated to reduce the driving current, thereby reducing the light-emitting brightness of the corresponding sub-pixel of the light-emitting element OLED.

[0089] Figure 9 It shows Figure 8 The driving timing diagram of the circuit shown is as follows. Among them, with... Figure 8 The diagram uses P-type TFTs as an example. If N-type TFTs are used, the driving timing diagram will be different. Figure 9The waveform is the opposite, which will not be elaborated here. For example... Figure 9 As shown, the entire driving timing process can be divided into the following four stages within one frame of display refresh.

[0090] (1) t1 stage (capacitor reset stage): The gate scan signal Scan[n-1] of the n-1th row is low, the data reset module T4 is turned on, the first voltage Vint1 (negative voltage) is written to the gate of the drive unit T1 and stored in the capacitor Cst for retention.

[0091] (2) Stage t2 (Data Writing and Threshold Voltage Compensation Stage): The gate scan signal Scan[n] of the nth row is low, the data writing module T2 and the threshold voltage compensation module T3 are turned on, and the driving unit T1 is also turned on under the negative voltage Vint1 of capacitor Cst. The data voltage signal DATA is transmitted along T2, T1 and T3 and is finally stored in capacitor Cst until the voltage on capacitor Cst becomes Vdata-|Vth|, at which point T1 is turned off. Wherein, Vdata is the input data voltage and Vth is the threshold voltage of T1 itself. Through this operation, the threshold voltage Vth of T1 is extracted and the voltage of T1 is compensated.

[0092] (3) t3 stage (OLED reset stage): The gate scan signal Scan[n+1] of the n+1th row is low, T7 is turned on, and the second 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.

[0093] During the aforementioned t1~t3 stages, the pixel drive control signals ScanR[n], ScanG[n], and ScanB[n] all output a low-level -10V voltage, and the first current regulation unit T8 is in the open state.

[0094] (4) t4 stage (light emission stage): The gate scan signals Scan[n-1], Scan[n], and Scan[n+1] are all high level, and T2, T3, T4, and T7 are all turned off. The light emission control gate scan signal EM[n] of the nth row is low level, and T5 and T6 are turned on. At this time, the gate of T1 is in the open state under the action of the storage voltage Vdata-|Vth| of capacitor Cst. The pixel drive control signals ScanR[n], ScanG[n], and ScanB[n] are all output low level, and T8 is also in the open state. The current flows from the positive power supply voltage ELVDD through T5, T1, T6, and T8, and then flows to the negative power supply voltage ELVSS of the OLED, and the OLED emits light. ScanG[n], ScanR[n], and ScanB[n] output -5V, -8V, and -7V respectively, adjusting and reducing the current flowing through the G, R, and B OLEDs. This ensures that the luminous brightness of the G, R, and B sub-pixels matches, thereby improving the color cast issue. Among them, the green sub-pixel experiences the largest voltage reduction and the greatest reduction in luminous brightness, thus improving the overall green tint problem.

[0095] Figure 10 A schematic diagram of the transfer characteristic curves of a P-type transistor is shown. Figure 10 As shown, when the first current regulation unit uses a P-type TFT, the pixel driving control signal Scan[n] connected to the gate is low, indicating it is in the on state (the area with negative voltage in the figure), and high, indicating it is in the off state (the area with positive voltage in the figure). During stages t1 to t3, the pixel driving control signal Scan[n] outputs a voltage of -10V. During stage t4, the pixel driving control signals ScanR[n], ScanB[n], and ScanG[n] output voltages of -8V, -7V, and -5V, respectively. It can be seen that as the voltage decreases, the source and drain currents also decrease accordingly, thereby reducing the luminous brightness of each color sub-pixel in the OLED.

[0096] Figure 11 This application illustrates another circuit for improving display color distortion, using the modification of the original second light-emitting control unit into a second current regulation unit as an example. Figure 11 As shown, the circuit includes a driving and control module 100 and a light-emitting element 200. The driving and control module 100 includes a first light-emitting control unit 11, a driving unit 12, and a second current control unit 22 connected in series.

[0097] The first light-emitting control unit 11 is connected to the light-emitting signal EM[n], and is in the on state when the light-emitting signal EM[n] is at the first level.

[0098] In this embodiment, the first level can be either high or low, determined by the type of TFT used in the first light-emitting control unit 11. For example, if the first light-emitting control unit 11 uses a P-type TFT, the first level is low, meaning it is in the on state when low and in the off state when high.

[0099] The driving unit 12 is in the open state when the data voltage is greater than the threshold voltage of the driving unit 12.

[0100] The second current regulation unit 22 is connected to the pixel drive control signal Scan[n] at one end and to the light-emitting element 200 at the other end. When the pixel drive control signal Scan[n] is at the first level, it is in the open state and when the pixel drive control signal Scan[n] is at the second level, it is in the closed state.

[0101] In this embodiment, the first level can be either high or low, determined by the type of TFT used in the second current control unit 22. For example, if the second current control unit 22 uses a P-type TFT, the first level is low, meaning it is in an on state when low and in an off state when high. Similarly, if the second current control unit 22 uses an N-type TFT, the first level is high, meaning it is in an on state when high and in an off state when low.

[0102] When the first light-emitting control unit 11, the driving unit 12, and the second current regulation unit 22 are all in the open state, driving current is provided to the light-emitting element 200.

[0103] The second current regulation unit 22 is used to adjust (e.g., reduce) the driving current based on the pixel driving control signal Scan[n] in the open state, so as to adjust (e.g., reduce) the light emission brightness of the corresponding pixel of the light emission element 200.

[0104] In this embodiment of the application, the circuit may further include:

[0105] The light-emitting element reset module 300 is connected at one end to the second voltage Vint2 and at the other end to the second node D2. It is used to reset the light-emitting element 200 based on the second voltage Vint2 when the second current control unit 232 is in the off state. The second node D2 is the connection node between the second current control unit 22 and the light-emitting element 200.

[0106] The following is combined Figure 11 and Figure 12 Detailed description Figure 6The specific application scenario of the circuit shown is illustrated using the example of modifying the original light-emitting control unit in the 7T1C LTPS pixel driving circuit into a second current regulation unit. Figure 11 The functions of each module were demonstrated. Figure 12 The connections between the various components are shown. For example... Figure 12 As shown, T5 is the first light-emitting control unit, connected to the light-emitting signal EM[n]. T1 is the driving unit. The modified T6 is the second current regulation unit. The gate of T6 is connected to the pixel driving control signal Scan[n], including: the red sub-pixel driving control signal ScanR[n], the green sub-pixel driving control signal ScanG[n], and the blue sub-pixel driving control signal ScanB[n]. The source of T6 is connected to T1, and the drain is connected to the light-emitting element OLED. T7 is the light-emitting element reset module, with its source connected to the second voltage Vint2 and its drain connected to the connection node between T6 and OLED. In the event of color shift due to increased current flowing through the driving unit T1, the pixel driving control signal Scan[n] is generated to reduce the driving current, thereby reducing the light-emitting brightness of the corresponding sub-pixel of the light-emitting element OLED.

[0107] Figure 13 It shows Figure 12 The driving timing diagram of the circuit shown is as follows. Among them, with... Figure 12 The diagram uses P-type TFTs as an example. If N-type TFTs are used, the driving timing diagram will be different. Figure 13 The waveform is the opposite, which will not be elaborated here. For example... Figure 13 As shown, the entire driving timing process can be divided into the following four stages within one frame of display refresh.

[0108] (1) t1 stage (capacitor reset stage): The gate scan signal Scan[n-1] of the n-1th row is low, the data reset module T4 is turned on, the first voltage Vint1 (negative voltage) is written to the gate of the drive unit T1 and stored in the capacitor Cst for retention.

[0109] (2) Stage t2 (Data Writing and Threshold Voltage Compensation Stage): The gate scan signal Scan[n] of the nth row is low, the data writing module T2 and the threshold voltage compensation module T3 are turned on, and the driving unit T1 is also turned on under the negative voltage Vint1 of capacitor Cst. The data voltage signal DATA is transmitted along T2, T1 and T3 and is finally stored in capacitor Cst until the voltage on capacitor Cst becomes Vdata-|Vth|, at which point T1 is turned off. Wherein, Vdata is the input data voltage and Vth is the threshold voltage of T1 itself. Through this operation, the threshold voltage Vth of T1 is extracted and the voltage of T1 is compensated.

[0110] (3) t3 stage (OLED reset stage): The gate scan signal Scan[n+1] of the n+1th row is low, T7 is turned on, and the second 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.

[0111] During the aforementioned t1~t3 stages, the pixel drive control signals ScanR[n], ScanG[n], and ScanB[n] all output a high-level 10V voltage, and the second current regulation unit T6 is in the off state.

[0112] (4) t4 stage (light emission stage): The gate scan signals Scan[n-1], Scan[n], and Scan[n+1] are all high level, and T2, T3, T4, and T7 are all turned off. The light emission control gate scan signal EM[n] of the nth row is low level, and T5 and T6 are turned on. At this time, the gate of T1 is in the open state under the action of the storage voltage Vdata-|Vth| of capacitor Cst. The pixel drive control signals ScanR[n], ScanG[n], and ScanB[n] are all output low level, and T6 is also in the open state. The current flows from the positive power supply voltage ELVDD through T5, T1, and T6, and then flows to the negative power supply voltage ELVSS of the OLED, and the OLED emits light. ScanG[n], ScanR[n], and ScanB[n] output -5V, -8V, and -7V respectively, adjusting and reducing the current flowing through the G, R, and B OLEDs. This ensures that the luminous brightness of the G, R, and B sub-pixels matches, thereby improving the color cast issue. The green sub-pixel experiences the largest voltage drop and the greatest reduction in luminous brightness, effectively improving the overall green tint. Curves showing the voltage reduction and driving current changes for each sub-pixel can be found in [reference needed]. Figure 9 This will not be explained in detail here.

[0113] Figure 14 This application illustrates another circuit for improving display color distortion, using the modification of the original first light-emitting control unit into a third current regulation unit as an example. Figure 14 As shown, the circuit includes a driving and control module 100 and a light-emitting element 200. The driving and control module 100 includes a third current control unit 23, a driving unit 12, and a second light-emitting control unit 13 connected in series.

[0114] Among them, one end of the third current regulation unit 23 is connected to the pixel drive control signal Scan[n]. When the pixel drive control signal Scan[n] is at the first level, it is in the open state, and when the pixel drive control signal Scan[n] is at the second level, it is in the closed state.

[0115] In this embodiment, the first level can be either high or low, determined by the type of TFT used in the third current control unit 23. For example, if the third current control unit 23 uses a P-type TFT, the first level is low, meaning it is in an on state when low and in an off state when high. Similarly, if the third current control unit 23 uses an N-type TFT, the first level is high, meaning it is in an on state when high and in an off state when low.

[0116] The driving unit 12 is in the open state when the data voltage is greater than the threshold voltage of the driving unit 12.

[0117] The second light-emitting control unit 13 is connected to the light-emitting signal EM[n] at one end and to the light-emitting element 200 at the other end. It is in the open state when the light-emitting signal EM[n] is at the first level.

[0118] In this embodiment, the first level can be either high or low, determined by the type of TFT used in the second light-emitting control unit 13. For example, if the second light-emitting control unit 13 uses a P-type TFT, then the first level is low, meaning it is in the on state when low and in the off state when high.

[0119] When the third current regulation unit 23, the driving unit 12, and the second light-emitting control unit 13 are all in the open state, driving current is provided to the light-emitting element 200.

[0120] The third current regulation unit 23 is used to adjust (e.g., reduce) the driving current based on the pixel driving control signal Scan[n] in the open state, so as to adjust (e.g., reduce) the light emission brightness of the corresponding pixel of the light-emitting element 200.

[0121] In this embodiment of the application, the circuit may further include:

[0122] The light-emitting element reset module 300 is connected to the second voltage Vint2 at one end and to the third node D3 at the other end. It is used to reset the light-emitting element 200 based on the second voltage Vint2 when the third current regulation unit 23 is in the off state. The third node D3 is the connection node between the second light-emitting control unit 13 and the light-emitting element 200.

[0123] The following is combined Figure 14 and Figure 15 Detailed description Figure 6 The specific application scenario of the circuit shown is illustrated using the example of modifying the original light-emitting control unit in the 7T1C LTPS pixel driving circuit into a third current regulation unit. Figure 14 The functions of each module were demonstrated. Figure 15 The connections between the various components are shown. For example... Figure 15 As shown, T6 is the second light-emitting control unit, connected to the light-emitting signal EM[n]. T1 is the driving unit. The modified T5 is the third current regulation unit. The gate of T5 is connected to the pixel driving control signal Scan[n], including: the red sub-pixel driving control signal ScanR[n], the green sub-pixel driving control signal ScanG[n], and the blue sub-pixel driving control signal ScanB[n]. The source of T5 is connected to ELVDD, and the drain is connected to T1. T7 is the light-emitting element reset module, with its source connected to the second voltage Vint2 and its drain connected to the connection node between T6 and the OLED. In the event of color shift due to increased current flowing through the driving unit T1, the pixel driving control signal Scan[n] is generated to reduce the driving current, thereby reducing the light-emitting brightness of the corresponding sub-pixel of the light-emitting element OLED. The driving timing diagram of the above circuit can be referred to Figure 13 Within one frame of display refresh time, the entire driver timing, including four stages, is also referenced. Figure 13 The corresponding explanations will not be repeated here.

[0124] In this application embodiment, the pixel driving control signal Scan[n] involved in any of the above embodiments can be generated by GOA. The gate driving circuit can be located on the left side of the screen, or on the right side of the screen, or on both the left and right sides of the screen respectively; there is no specific limitation. Located on the left or right side, both belong to a single-drive scenario; located on both the left and right sides, it belongs to a dual-drive scenario. This application embodiment does not specifically limit this.

[0125] Figure 16 A schematic diagram of the GOA pixel driving control signal provided in an embodiment of this application is shown. Figure 16 As shown, the pixel drive control signals ScanR[n], ScanG[n], and ScanB[n] are generated by the gate drive circuit located in the black GOA area on the right side of the screen, and are respectively connected to the R, G, and B sub-pixel drive circuits within a row of pixels in the AA (Active Area, the actual display pixel light-emitting area). The figure shows a single-drive scenario, with the GOA area arranged only on one side of the screen. "1-to-1" means that one GOA circuit module drives one row of pixels.

[0126] This application also provides an electronic device, which may include: a display panel and a circuit for improving display color distortion as described in any of the above embodiments. The function of the circuit is the same as that described in the above embodiments, and it can achieve the same technical effect, so it will not be described again here.

[0127] See Figure 17This is a schematic flowchart of a method for improving color distortion in displays provided in an embodiment of this application. Figure 17 As shown, the method is applied to a circuit for improving display color distortion as described in any of the above embodiments, and the method specifically includes the following steps.

[0128] S1702: Provides driving current to the light-emitting element based on the light-emitting signal EM[n], so that the light-emitting element emits light.

[0129] S1704: Adjust the driving current based on the pixel driving control signal Scan[n] to adjust the luminous brightness of the corresponding pixel of the light-emitting element.

[0130] In this embodiment of the application, step S1704 may specifically include:

[0131] The driving current is reduced based on the pixel driving control signal Scan[n] to reduce the luminous brightness of the corresponding pixel of the light-emitting element.

[0132] Among them, the pixel drive control signal (Scan[n]) represents the state of color deviation displayed.

[0133] In this embodiment of the application, before step S1702, the method may further include:

[0134] When the display is in a color cast state, the pixel drive control signal is acquired.

[0135] In one implementation, the pixel drive control signal (Scan[n]) indicates that the current temperature is greater than a first threshold or the cumulative display time is greater than a second threshold.

[0136] In this embodiment of the application, the pixel driving control signal (Scan[n]) can be generated through the following steps:

[0137] Detect the current temperature or the accumulated display time. If the current temperature is greater than the first threshold or the accumulated display time is greater than the second threshold, generate a pixel drive control signal Scan[n].

[0138] The first and second thresholds can be set as needed, and their specific values ​​are not limited. For example, the first threshold could be 50 degrees, and the second threshold could be 1 year.

[0139] The pixel driving control signal Scan[n] includes at least one of the following: red sub-pixel driving control signal ScanR[n], green sub-pixel driving control signal ScanG[n], and blue sub-pixel driving control signal ScanB[n]. The voltage of any sub-pixel driving control signal during the light-emitting phase is lower than the voltage of that sub-pixel driving control signal during the reset data write compensation phase. In practical applications, a corresponding sub-pixel driving control signal is generated for the color that causes color cast, thereby overcoming the color cast problem.

[0140] Among them, the voltage values ​​output by the red sub-pixel drive control signal ScanR[n], the green sub-pixel drive control signal ScanG[n], and the blue sub-pixel drive control signal ScanB[n] can be linearly increased and adjusted within the voltage range of -10V to 10V according to the current temperature or the accumulated display time.

[0141] The method provided in this application embodiment provides a driving current to the light-emitting element based on the light-emitting signal EM[n] to make the light-emitting element emit light, and adjusts the driving current based on the pixel driving control signal Scan[n] that represents the color deviation state of the display to adjust the light-emitting brightness of the corresponding pixel of the light-emitting element, thereby improving the problem of color deviation and enhancing the display effect.

[0142] See Figure 18 This is a schematic diagram of the structure of the electronic device provided in an embodiment of this application. Figure 18 As shown, this application embodiment also provides an electronic device 1800, including a processor 1801 and a memory 1802. The memory 1802 stores a program or instructions that can run on the processor 1801. When the program or instructions are executed by the processor 1801, they implement the various steps of the above-described method embodiment for improving display color distortion and can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0143] It should be noted that the electronic devices in the embodiments of this application include mobile electronic devices and non-mobile electronic devices.

[0144] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described method embodiments for improving display color distortion and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0145] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0146] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described method embodiments for improving display color distortion, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0147] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0148] This application provides a computer program product stored in a storage medium. The program product is executed by at least one processor to implement the various processes of the above-described method embodiment for improving display color distortion, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0149] 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.

[0150] 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.

[0151] 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 color distortion in displays, characterized in that, include: The driving and control module is used to provide driving current to the light-emitting element based on the light emission signal (EM[n]) and adjust the driving current based on the pixel driving control signal (Scan[n]) to adjust the light emission brightness of the corresponding pixel of the light-emitting element; The light-emitting element is connected to the driving and control module and is used to emit light under the action of the driving current provided by the driving and control module. The driving process of the circuit includes a reset data writing compensation stage and an emission stage. The pixel driving control signal (Scan[n]) represents the state of color cast. The pixel driving control signal (Scan[n]) includes at least one of the following: Green sub-pixel driving control signal (ScanG[n]), red sub-pixel driving control signal (ScanR[n]), and blue sub-pixel driving control signal (ScanB[n]), wherein the voltage of any sub-pixel driving control signal during the light emission stage and the voltage during the reset data write compensation stage are both high or both low, and the absolute value of the voltage of any sub-pixel driving control signal during the light emission stage is lower than the absolute value of the voltage of any sub-pixel driving control signal during the reset data write compensation stage; If the absolute value of the voltage of any of the pixel drive control signals during the light emission stage is lower than the absolute value of the voltage during the reset data write compensation stage, the drive and control module reduces the drive current during the light emission stage using any of the pixel drive control signals.

2. The circuit according to claim 1, characterized in that, The driving and control module includes: a light-emitting control and driving unit and a current control unit; The light emission control and driving unit and the current regulation unit are connected in series. One end of the light emission control and driving unit is connected to the light emission signal (EM[n]), and one end of the current regulation unit is connected to the pixel driving control signal (Scan[n]). The light-emitting control and driving unit is used to provide driving current to the light-emitting element based on the light-emitting signal (EM[n]); The current regulation unit is used to adjust the driving current based on the pixel driving control signal (Scan[n]) to adjust the luminous brightness of the corresponding pixel of the light-emitting element; One end of the current regulation unit is connected to the light-emitting element, or one end of the light-emitting control and driving unit is connected to the light-emitting element.

3. The circuit according to claim 2, characterized in that, One end of the current regulation unit is connected to the light-emitting element, and the circuit further includes: The light-emitting element reset module has one end connected to the second voltage (Vint2) and the other end connected to the first node (D1). The first node (D1) is the connection node between the light-emitting control and driving unit and the current regulation unit. The light-emitting element reset module is used to reset the light-emitting element based on the second voltage (Vint2).

4. The circuit according to claim 2, characterized in that, One end of the light-emitting control and driving unit is connected to the light-emitting element, and the circuit further includes: The light-emitting element reset module has one end connected to the second voltage (Vint2) and the other end connected to the second node (D2). The second node (D2) is the connection node between the light-emitting control and drive unit and the light-emitting element. The light-emitting element reset module is used to reset the light-emitting element based on the second voltage (Vint2).

5. The circuit according to any one of claims 1-4, characterized in that, The pixel drive control signal (Scan[n]) is generated by a gate drive circuit located on the left side of the screen, or on the right side of the screen, or on both the left and right sides of the screen respectively.

6. An electronic device, characterized in that, include: The display panel and the circuit for improving display color distortion as claimed in any one of claims 1-5.

7. A method for improving color cast in displays, characterized in that, The method, applied to a circuit for improving color distortion as described in any one of claims 1-5, comprises: The light-emitting element is driven by a light-emitting signal (EM[n]) to emit light. The driving current is adjusted based on the pixel driving control signal (Scan[n]) to adjust the luminous brightness of the corresponding pixel of the light-emitting element; The pixel drive control signal (Scan[n]) represents the state of color cast.

8. The method according to claim 7, characterized in that, The pixel drive control signal (Scan[n]) indicates that the current temperature is greater than the first threshold or the cumulative display time is greater than the second threshold.

9. The method according to claim 7 or 8, characterized in that, Before providing a driving current to the light-emitting element based on the light-emitting signal, the method further includes: When the display is in a color cast state, the pixel drive control signal is acquired.

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