Electronic device

Abstract

The application discloses an electronic device, comprising: a power module comprising a charging IC and a battery; a screen module comprising a display driving IC and a pixel unit, the display driving IC being used for powering the pixel unit, the display driving IC having a synchronous mode and an asynchronous mode; a first end of the charging IC being used for connecting with an external charger, a second end of the charging IC being connected with the battery, and a third end of the charging IC being connected with the display driving IC; a detection circuit being connected with the charging IC; in the case of meeting a first condition, the display driving IC is kept in the synchronous mode or kept in the asynchronous mode, the first condition being that the detection circuit detects that the charging IC is connected with the external charger, the first end of the charging IC is conducted with the third end of the charging IC, and the second end of the charging IC is disconnected with the third end of the charging IC; and in the case of not meeting the first condition, the display driving IC can be switched between the synchronous mode and the asynchronous mode.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, and specifically relates to an electronic device. Background Technology

[0002] In existing electronic devices, display driver ICs are used to output power signals to the screen module to drive the screen module to light up. Display driver ICs have two operating modes. When their input voltage is close to their output voltage, in order to ensure that the transistors in the display driver IC have enough time to turn on and to save power, the display driver IC switches from synchronous mode to asynchronous mode.

[0003] Currently, when electronic devices are fully charged and the charger is not disconnected, in order to avoid the phenomenon of battery bulging caused by frequent charging and discharging, the power supply to the display driver IC is controlled by the charger. In this case, the output power ripple of the display driver IC becomes larger, and when the display driver IC switches modes, it can easily cause screen flickering in the screen module, affecting the display effect of the screen module. Summary of the Invention

[0004] This application aims to provide an electronic device that at least solves the problem that screen flickering can easily occur in the screen module when the display driver IC switches modes, thus affecting the display effect of the screen module.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: This application provides an electronic device, including: Power module, including charging IC and battery; The screen module includes a display driver IC and pixel units. The display driver IC is used to power the pixel units and has synchronous and asynchronous modes. The first terminal of the charging IC is used to connect to an external charger, the second terminal of the charging IC is connected to the battery, and the third terminal of the charging IC is connected to the display driver IC. The detection circuit is connected to the charging IC; Under the condition that the first condition is met, the display driver IC remains in the synchronous mode or in the asynchronous mode. The first condition is that the detection circuit detects that the charging IC is connected to the external charger, and the first terminal of the charging IC is connected to the third terminal of the charging IC, and the second terminal of the charging IC is disconnected from the third terminal of the charging IC. If the first condition is not met, the display driver IC can switch between the synchronous mode and the asynchronous mode.

[0006] In the embodiments of this application, the detection circuit can detect the connection status of the charging IC. When the detection circuit detects that the charging IC is connected to an external charger, and the first terminal of the charging IC is connected to the third terminal of the charging IC, and the second terminal of the charging IC is disconnected from the third terminal of the charging IC, the connection status of the charging IC satisfies a first condition. Under the first condition, the display driver IC remains in the synchronous mode or remains in the asynchronous mode. This can restrict the display driver IC from switching modes under the first condition, thereby avoiding scenarios where the input power supply of the display driver IC is unstable when it switches modes, ensuring that the output power supply of the display driver IC can output stable and small ripples, thereby reducing the risk of screen flickering in the screen module and ensuring the display effect of the screen module.

[0007] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0008] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a power supply circuit according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a display driver IC according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a detection circuit according to an embodiment of this application; Figure 4 This is a schematic diagram of the current direction during capacitor charging according to an embodiment of this application; Figure 5 This is a schematic diagram showing the current direction during capacitor discharge according to an embodiment of this application; Figure 6 This is a waveform diagram of a triangular wave control circuit according to an embodiment of this application; Figure 7 This is a flowchart illustrating a mode switching process according to an embodiment of this application; Figure 8 This is a flowchart illustrating another mode switching process in an embodiment of this application.

[0009] Figure label: 100. Screen module; 110. Display driver IC; Cin. Input capacitor; L1. Inductor; VD. Diode; Q1. Power transistor; Q2. Mode switch; Cout. Input capacitor; 111. Mode control circuit; T3. Second logic AND device; 112. Pulse control circuit; T1. Second amplifier; 113. Feedback control circuit; Vref1. Third preset power supply; T2. Third comparator; R2. Tenth resistor; R3. Eleventh resistor; 120. Pixel unit; 121. Screen IC; 200. Power module; 210. Charging IC; 220. Battery; 300, Detection circuit; T4, Differential arithmetic unit; T5, First comparator; T6, First logic AND device; Vref3, First preset power supply; R1, First resistor; Rf1, Second resistor; 400. Triangle wave control circuit; R4, third resistor; R5, fourth resistor; R10, fifth resistor; K1, first switch; K2, second switch; R6, sixth resistor; R9, seventh resistor; R8, eighth resistor; R7, ninth resistor; C1, capacitor; T7, first amplifier; T8, second comparator; 500. External charger. Detailed Implementation

[0010] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0011] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0012] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0013] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0014] The following is combined with Figures 1-8 This application describes an electronic device according to an embodiment of the present application.

[0015] like Figure 1 and Figure 2 As shown, an electronic device according to some embodiments of this application includes a power module 200 and a screen module 100, and the electronic device is further provided with a detection circuit 300 and a triangular wave control circuit 400. The power module 200 includes a charging IC 210 and a battery 220; the screen module 100 includes a display driver IC 110 and a pixel unit 120, the display driver IC 110 is used to power the pixel unit 120, and the display driver IC 110 has a synchronous mode and an asynchronous mode; the first terminal of the charging IC 210 is used to connect to an external charger 500, the second terminal of the charging IC 210 is connected to the battery 220, and the third terminal of the charging IC 210 is connected to the display driver IC 110; a detection circuit 300 is connected to the charging IC 210; under a first condition, the display driver IC 110 remains in either the synchronous mode or the asynchronous mode, the first condition being that the detection circuit 300 detects that the charging IC 210 is connected to the external charger 500, and the first terminal and the third terminal of the charging IC 210 are connected, and the second terminal and the third terminal of the charging IC 210 are disconnected; under a condition that the first condition is not met, the display driver IC 110 can switch between the synchronous mode and the asynchronous mode.

[0016] In the embodiments of this application, the detection circuit 300 can detect the connection status of the charging IC 210. When the detection circuit 300 detects that the charging IC 210 is connected to the external charger 500, and the first terminal of the charging IC 210 is connected to the third terminal of the charging IC 210, and the second terminal of the charging IC 210 is disconnected from the third terminal of the charging IC 210, the connection status of the charging IC 210 satisfies the first condition. Under the first condition, the display driver IC 110 remains in the synchronous mode or remains in the asynchronous mode. This can restrict the display driver IC 110 from switching modes under the first condition, thereby avoiding scenarios where the input power of the display driver IC 110 is unstable when it switches modes, ensuring that the output power of the display driver IC 110 can output stable and small ripples, thereby reducing the risk of screen flickering in the screen module 100 and ensuring the display effect of the screen module 100.

[0017] The electronic devices described in this application include, for example, mobile phones, tablet computers, and various smart wearable devices. The electronic devices include a power module 200 and a screen module 100. The power module 200 is the "power supply heart" of the entire electronic device; the screen module 100 is an integrated display and touch module in the electronic device. The screen module 100 includes a display driver IC 110 and pixel units 120. The input terminal of the display driver IC 110 can be connected to a battery 220 or an external charger 500 via a charging IC 210, and the output terminal of the display driver IC 110 can be connected to the pixel units 120. The display driver IC 110 can supply power to the pixel units 120 to control the brightness or color of the pixels, thereby illuminating and displaying the image.

[0018] Optionally, the screen module 100 is a component that integrates a display screen and related functional components, enabling complete display functionality. The display screen can be an Organic Light-Emitting Diode (OLED) screen or an Active-Matrix Organic Light-Emitting Diode (AMOLED) screen, etc. The pixel unit 120 is part of the display screen, which also includes a screen IC that can drive the pixel unit 120 to light up.

[0019] Optionally, with the first and second terminals of the charging IC210 connected, the external charger 500 can charge the battery 220. The charging IC210 can be a common charging integrated circuit. The external device can be a Universal Serial Bus Type C device. C, USB Type C) Connectors such as Lightning connector, MicroUSB connector, etc. The battery 220 can be of various types, such as silicon battery 220 or lithium battery 220, etc.

[0020] Optionally, the first terminal of the charging IC210 is connected to the external charger 500, the second terminal of the charging IC210 is connected to the battery 220, and the third terminal of the charging IC210 is connected to the display driver IC110. Under the action of the charging IC210, the external charger 500 or the battery 220 can provide input power to the display driver IC110.

[0021] Furthermore, when the first and third terminals of charging IC 210 are disconnected, but the second and third terminals are connected, and the external charger 500 is not plugged into charging IC 210, the battery 220 and display driver IC 110 are connected, allowing the battery 220 to provide input power to the display driver IC 110. When the first and third terminals of charging IC 210 are connected, and the first and second terminals are connected, and the external charger 500 is plugged into charging IC 210, the external charger 500 and battery 220 are connected, enabling the external charger 500 to charge the battery 220. Additionally, charging IC 210 can also connect the external charger 500 and display driver IC 110, allowing the external charger 500 to provide input power to the display driver IC 110, thus preventing frequent charging and discharging of the battery 220 and avoiding bulging of the battery 220.

[0022] Optionally, the charging IC 210 may include a first transistor QBAT, which may have a VSYS pin and a VBAT pin. The VSYS pin can be connected to the display driver IC 110, and the VBAT pin can be connected to the battery 220. The first transistor QBAT can control current / voltage, amplify and switch signals, and also perform functions such as circuit isolation and impedance matching. Specifically, when the first transistor QBAT controls the VSYS pin and VBAT pin to be on, the battery 220 can provide input power to the display driver IC 110.

[0023] Optionally, the display driver IC110 has synchronous and asynchronous modes, and can switch between the two. When the screen changes dynamically, the display driver IC110 can switch to synchronous mode to ensure smooth and synchronized display; when the screen is static or partially displayed, the display driver IC110 can switch to asynchronous mode to reduce the refresh rate and power consumption, achieving a balance between energy efficiency and display effect. For example, the input power supply of the display driver IC110 is represented by VIN, and the output power supply by VOUT. When the input power supply VIN is close to the output power supply VOUT, in order to ensure that the switching transistor has sufficient time to turn on while saving power, the display driver IC110 can switch from synchronous mode to asynchronous mode.

[0024] Optionally, the detection circuit 300 is connected to the charging IC 210 and can detect the connection status of the charging IC 210 to identify whether the input power supply of the display driver IC 110 is stable. For example, when the battery 220 is fully charged and the external charger 500 is not disconnected, the input power supply of the display driver IC 110 supplied by the external charger 500 fluctuates significantly. In this case, the input power supply is in an unstable state. Or, other situations may cause significant fluctuations in the input power supply, resulting in an unstable input power supply. When the external charger 500 is not plugged in to charge the battery 220, the input power supply supplied by the battery 220 to the display driver IC 110 fluctuates less, and the input power supply is in a stable state.

[0025] Specifically, the detection circuit 300 detects that the charging IC 210 is connected to the external charger 500, and that the first terminal of the charging IC 210 is conducting with its third terminal, while the second terminal of the charging IC 210 is disconnected from its third terminal, thus satisfying the first condition. When the first condition is met, because the external charger 500 supplies power to the display driver IC 110, the input power supply of the display driver IC 110 fluctuates significantly. By controlling the display driver IC 110 to remain in synchronous or asynchronous mode, mode switching can be avoided under conditions of large fluctuations, thereby reducing screen flickering in the screen module 100 and effectively ensuring the display effect of the screen module 100. When the first condition is not met, the input power supply of the display driver IC 110 fluctuates less and is more stable. The display driver IC 110 can switch between synchronous and asynchronous modes, reducing the risk of screen flickering in the screen module 100 and resulting in a better display effect.

[0026] In this embodiment, the display driver IC 110 can remain in synchronous mode or asynchronous mode when its input power supply is unstable, and can switch modes when its input power supply is stable. This can avoid large output ripple of the output power supply of the display driver IC 110, thereby ensuring that the display driver IC 110 outputs stable power to the display screen, reducing the risk of screen flickering in the screen module 100, and ensuring the display effect of the screen module 100.

[0027] In some optional embodiments of this application, the detection circuit 300 can be connected to the second terminal and the third terminal of the charging IC 210 respectively to detect the voltage difference between the second terminal and the third terminal of the charging IC 210; when the detection circuit 300 detects that the voltage difference is greater than a preset voltage, the first condition is satisfied.

[0028] In this embodiment, by comparing the voltage difference between the second terminal and the third terminal of the charging IC210, it is easy to determine whether the connection status of the charging IC210 meets the first condition, thereby knowing whether the input power supply of the display driver IC110 is stable. The implementation method is relatively simple and convenient.

[0029] Optionally, the preset voltage can be set according to actual needs, and this embodiment does not impose specific limitations on it.

[0030] Optionally, when the voltage difference between the second terminal and the third terminal of the charging IC210 is less than or equal to a preset voltage, the input voltage of the display driver IC110 fluctuates less, making the input voltage of the display driver IC110 stable and not satisfying the first condition; when the voltage difference between the two terminals of the charging IC210 is greater than the preset voltage, the input voltage of the display driver IC110 fluctuates more, making the input voltage of the display driver IC110 unstable and satisfying the first condition.

[0031] In some embodiments of this application, the detection circuit 300 may include an extraction module, a first power supply module, and a comparison module; the extraction module is connected to the second terminal and the third terminal of the charging IC 210 respectively, and is used to obtain the voltage difference between the second terminal and the third terminal of the charging IC 210; the comparison module is connected to the extraction module and the first power supply module respectively, and is used to compare the voltage difference with a preset voltage.

[0032] In this embodiment, the comparison module can receive the voltage difference and the preset voltage respectively, and then compare the voltage difference with the preset voltage to obtain whether the voltage difference is less than the preset voltage, and then obtain whether the input power supply of the display driver IC110 is in a stable state and whether the first condition is met.

[0033] Optionally, the extraction module is used to acquire the voltage difference between the second terminal and the third terminal of the charging IC210. ​​The extraction module may include a difference calculation unit T4, an operational amplifier, or a differential voltage sensor, etc. The comparison module is used to compare the voltage difference with a preset voltage; the comparison module may include an operational amplifier or a comparator, etc.

[0034] In some optional embodiments of this application, the extraction module includes a difference arithmetic unit T4, and the comparison module includes a first comparator T5; the first input terminal of the difference arithmetic unit T4 is connected to the second terminal of the charging IC 210, and the second input terminal of the difference arithmetic unit T4 is connected to the third terminal of the charging IC 210; the first input terminal of the first comparator T5 is connected to the first power module, and the second input terminal of the first comparator T5 is connected to the output terminal of the difference arithmetic unit T4.

[0035] In this embodiment, after the voltage difference between the second terminal and the third terminal of the charging IC210 is obtained by the difference arithmetic unit T4, the voltage difference signal can be input to the second input terminal of the first comparator T5. The first comparator T5 can then receive a preset voltage through its first input terminal, thereby comparing the voltage difference with the preset voltage, which can improve the accuracy of the detection structure.

[0036] In some embodiments of this application, the electronic device includes a controller, and the detection circuit 300 further includes a first logic AND device T6; the first input terminal of the first logic AND device T6 is connected to a comparison module, the second input terminal of the first logic AND device T6 is connected to the controller, and the output terminal of the first logic AND device T6 is connected to a display driver IC 110; when the comparison module obtains that the voltage difference is less than or equal to a preset voltage, and the controller sends a mode switching command to the first logic AND device T6, the first logic AND device T6 sends a second signal to the display driver IC 110; wherein, the display driver IC 110 can switch between the synchronous mode and the asynchronous mode according to the second signal.

[0037] In this embodiment, the first input terminal of the first logic AND device T6 is connected to the comparison module to receive the comparison result of the voltage difference and the preset voltage. The second input terminal of the first logic AND device T6 is connected to the controller to receive the mode switching command issued by the controller. When the voltage difference is less than or equal to the preset voltage and the mode switching command is received, the first logic AND device T6 can send a second signal to the display driver IC 110. The display driver IC 110 performs mode switching upon receiving the second signal, which can effectively avoid the display driver IC 110 performing mode switching under the first condition.

[0038] Optionally, the detection circuit 300 can be connected to the controller to obtain mode switching instructions issued by the controller. The mode switching instruction (As mode CTRL) can be an instruction instructing the display driver IC 110 to switch from synchronous mode to asynchronous mode, or an instruction instructing the display driver IC 110 to switch from asynchronous mode to synchronous mode. The controller can be various control chips 121 in the electronic device, such as a central processing unit (CPU).

[0039] Optionally, when the voltage difference is less than or equal to a preset voltage, the comparison module can input a high-level signal to the first input terminal of the first logic AND device T6; when the voltage difference is greater than the preset voltage, the comparison module can input a low-level signal to the first input terminal of the first logic AND device T6. When the controller issues a mode switching command, the controller can input a high-level signal to the second input terminal of the first logic AND device T6. When both input terminals of the first logic AND device T6 are at high levels, a second signal can be sent to the display driver IC 110. Upon receiving the second signal, the display driver IC 110 can switch from synchronous mode to asynchronous mode, or from asynchronous mode to synchronous mode.

[0040] Optionally, the second signal can be a high-level signal; when the first logic AND device T6 inputs a low-level signal to the display driver IC110, the display driver IC110 can remain in asynchronous mode or in synchronous mode.

[0041] In some embodiments of this application, the first power module includes a first resistor R1, a second resistor Rf1, and a first preset power supply Vref3; the first end of the first resistor R1 is connected to the first preset power supply Vref3, and the second end of the first resistor R1 is connected to the comparison module; the first end of the second resistor Rf1 is grounded, and the second end of the second resistor Rf1 is connected to the first resistor R1 and the comparison module respectively.

[0042] In the embodiments of this application, the first resistor R1, the second resistor Rf1, and the first preset power supply Vref3 cooperate with each other to improve the reliability and stability of inputting the preset voltage to the comparison module.

[0043] In the embodiments of this application, such as Figure 2 and Figure 3 As shown, the absolute value of the difference between the third terminal VSYS and the second terminal VBAT of the charging IC210, |VSYS-VBAT|, can be calculated using the difference operator T4. The calculated output is given to the second input terminal, i.e., the negative input a, of the first comparator T5. The first input terminal of the first comparator T5 is the positive input terminal b, i.e. The preset voltage Vref3 of the first preset power supply can be adaptively adjusted according to different needs. By comparing the voltage of the positive and negative input terminals of the first comparator T5, the first comparator T5 can output a high / low level to the first logic AND device T6. The first logic AND device T6 has two inputs, one connected to the controller and the other connected to the output terminal of the first comparator T5. When both inputs of the first logic AND device T6 are high, a second signal can be output to the display driver IC, so that the display driver IC enters a new mode.

[0044] In this embodiment of the application, the pressure difference between VBAT and VSYS In cases where the first condition is not met, the display driver IC110 can avoid a state of large fluctuations in its input power supply during mode switching, thereby avoiding the superposition of input ripple fluctuations in its output power supply and reducing the risk of screen flickering in the screen module.

[0045] In some optional embodiments of this application, the display driver IC 110 includes a mode control circuit 111 and a mode switching switch Q2; the first input terminal of the mode switching switch Q2 is connected to the third terminal of the charging IC 210, the second input terminal of the mode switching switch Q2 is connected to the output terminal of the mode control circuit 111, and the output terminal of the mode switching switch Q2 is connected to the pixel unit 120; the mode control circuit 111 is connected to the detection circuit 300, and the mode control circuit 111 controls the on / off state of the mode switching switch Q2.

[0046] In this embodiment, the mode control circuit 111 can control the on / off state of the mode switching switch Q2 based on the detection result of the detection circuit 300, thereby controlling whether the display driver IC 110 can perform mode switching, which can improve the reliability of controlling the display driver IC 110 to perform mode switching when the first condition is not met.

[0047] Optionally, the mode control circuit 111 is connected to the mode switching switch Q2. The mode control circuit 111 can output control commands to the mode switching switch Q2 to control its on / off state. When the first condition is met, the detection circuit 300 can send a low-level signal to the mode control circuit 111. The mode control circuit 111 can then control the mode switching switch Q2 to remain on based on the low-level signal, preventing the display driver IC 110 from switching modes. When the first condition is not met, the detection circuit 300 can send a high-level signal to the mode control circuit 111. The mode control circuit 111 can then control the mode switching switch Q2 to switch based on the high-level signal, enabling the display driver IC 110 to switch modes. The mode switching switch Q2 can be a transistor or a MOSFET, etc.

[0048] In some embodiments of this application, the electronic device includes a triangular wave control circuit 400, and the display driver IC 110 includes a pulse control circuit 112; the output terminal of the pulse control circuit 112 is connected to the second input terminal of the mode control circuit 111; the triangular wave control circuit 400 is connected to the first input terminal of the pulse control circuit 112; wherein, if the first condition is not met, and the triangular wave control circuit 400 sends a first signal to the pulse control circuit 112, the mode control circuit 111 controls the mode switching switch Q2 to switch.

[0049] In this embodiment, if the first condition is not met and the triangular wave control circuit 400 sends a first signal to the pulse control circuit 112, the input signal of the pulse control circuit can be adjusted to facilitate the adjustment of the duty cycle and frequency of the output ripple of the pulse control circuit 112. This allows the mode control circuit 111 to control the mode switching switch Q2 to switch quickly, enabling the display driver IC 110 to switch modes quickly, shortening the adjustment time, ensuring smoother mode switching of the display driver IC 110, and reducing the output ripple of the display driver IC 110, further reducing the risk of screen flickering in the screen module.

[0050] In some optional embodiments, the display driver IC 110 may further include a power transistor Q1 and a diode VD; the diode VD is connected in parallel with the mode switching switch Q2, and the diode VD is a parasitic diode of the mode switching switch Q2; the first terminal of the power transistor Q1 can be connected to the pulse control circuit 112, the second terminal of the power transistor Q1 can be connected to the mode switching switch Q2 and the diode VD respectively, and the third terminal of the power transistor Q1 can be grounded. The power transistor Q1 can be a transistor such as a bipolar transistor or a MOSFET, and can be configured with reference to the mode switching switch Q2.

[0051] In this circuit, power transistor Q1 and mode switch Q2 form the upper and lower transistor paths. When the display driver IC110 is in synchronous mode, mode switch Q2 is turned on, power transistor Q1 is turned off, and power flows through the body of mode switch Q2, resulting in low impedance. When the display driver IC110 is in asynchronous mode, mode switch Q2 is turned off, power transistor Q1 is turned on, and diode VD is turned on, allowing power to flow through diode VD.

[0052] In some optional embodiments, the display driver IC 110 may include an input capacitor Cin, an inductor L1, and an output capacitor Cout. The input terminal of the mode switching switch Q2 is connected to the input capacitor Cin through the inductor L1, and the output terminal of the mode switching switch Q2 is connected to the output capacitor Cout. The input capacitor Cin is connected to the third terminal of the charging IC 210, and the output capacitor Cout is connected to the pixel unit 120.

[0053] Optionally, in synchronous mode, the power of display driver IC110 is supplied through the mode switching switch Q2. In this case, the output voltage of display driver IC110 satisfies: Where D1 is the duty cycle of the pulse control circuit 112; as the input voltage VIN approaches the output voltage VOUT, D1 gets closer and closer to 0%. To ensure that the mode switching switch Q2 can switch normally, it is necessary to control the display driver IC 110 to enter asynchronous mode, that is, to control the mode switching switch Q2 to open, and the power flows through the diode VD. At this time, the output voltage of the display driver IC 110 satisfies: Where VF is the forward voltage drop of diode VD. When the display driver IC switches modes, D1 needs to increase instantaneously to ensure the stability of VOUT. This change process is the mode switching time t. During this switching process, the ripple fluctuation of the input voltage will cause the output ripple of the display driver IC110 to be too large, which may easily lead to the risk of screen flickering in the screen module.

[0054] In this embodiment, the connection status of the charging IC 210 can be detected by the detection circuit 300 to determine whether the input power supply of the display driver IC 110 is stable. Specifically, if the first condition is met, the input power supply of the display driver IC 110 is unstable. In this case, the display driver IC 110 is controlled to remain in synchronous mode or asynchronous mode. If the first condition is not met, the input power supply of the display driver IC 110 is stable. In this case, the display driver IC 110 can switch modes according to the first signal.

[0055] Optionally, the mode control circuit 111 includes a second logic AND device T3, the first input terminal of the second logic AND device T3 is connected to the detection circuit 300, the second input terminal of the second logic AND device T3 is connected to the pulse control circuit 112, and the output terminal of the second logic AND device T3 is connected to the mode switching switch Q2.

[0056] In some embodiments, the display driver IC 110 may include a mode control circuit 111, a pulse control circuit 112, and a feedback control circuit 113. The input terminal of the pulse control circuit 112 is connected to the feedback control circuit 113, and the output terminal of the pulse control circuit 112 is connected to the mode control circuit 111. The feedback control circuit 113 and the pulse control circuit 112 work together to form the core module for achieving stable power output and efficient operation. The core of the feedback control circuit 113 is to achieve precise voltage / current regulation and stable control. The pulse control circuit, i.e., the PWM (Pulse Width Modulation Circuit), can generate high-frequency pulse signals to drive the switching transistor, achieving efficient energy conversion.

[0057] Optionally, the feedback control circuit 113 may include a third comparator T2. The first input terminal of the third comparator T2 may be connected to a third preset power supply Vref1. The second input terminal of the third comparator T2 may be connected to the output terminal of the display driver IC 110 through a tenth resistor R2 and grounded through an eleventh resistor R3. The output terminal of the third comparator T2 may be connected to the pulse control circuit 112.

[0058] Optionally, the pulse control circuit 112 includes a second amplifier T1, the first input terminal of the second amplifier T1 is connected to the output terminal of the feedback control circuit 113; the second input terminal of the second amplifier T1 is connected to the triangular wave control circuit 400; and the output terminal of the second amplifier T1 is connected to the mode control circuit 111.

[0059] In some embodiments of this application, the electronic device includes a controller, which can be connected to a triangular wave control circuit 400. The first signal includes a first triangular wave. When the triangular wave control circuit 400 receives a mode switching command from the controller, it sends the first triangular wave to the pulse control circuit 112. When it does not receive a mode switching command from the controller, it sends a second triangular wave to the pulse control circuit 112. The frequency of the first triangular wave is greater than the frequency of the second triangular wave, and the duty cycle of the first triangular wave is greater than the duty cycle of the second triangular wave.

[0060] In this embodiment, during the switching process of the display driver IC 110 from synchronous mode to asynchronous mode, or vice versa, the triangular wave control circuit 400 inputs a first triangular wave to the mode control circuit 111. The first triangular wave has a large frequency and duty cycle, causing the duty cycle of the output waveform of the pulse control circuit 112 to increase rapidly. This shortens the adjustment time of the mode control circuit 111, enabling the display driver IC 110 to quickly switch from synchronous mode to asynchronous mode, or vice versa. Furthermore, the drop in the output power supply amplitude and duration of the display driver IC 110 can be reduced, and the output power supply of the display driver IC 110 can be stably made to reach the ELVDD voltage.

[0061] In this embodiment, during the process of switching from synchronous mode to asynchronous mode or from asynchronous mode to synchronous mode, the controller sends a mode switching command to the triangular wave control circuit 400. In this case, the controller can input a high-level signal to the triangular wave control circuit 400, so that the triangular wave control circuit 400 can input a first triangular wave to the pulse control circuit 112, which is beneficial for the display driver IC 110 to quickly switch modes. When the controller inputs a low-level signal to the triangular wave, the triangular wave control circuit 400 can input a second triangular wave to the pulse control circuit 112. In this case, the display driver IC 110 can remain in either synchronous mode or asynchronous mode.

[0062] In some embodiments of this application, the triangular wave control circuit 400 includes a second power supply module, a first switch K1, a second switch K2, and a triangular wave module, which is connected to the display driver IC 110. The second power supply module includes a third resistor R4, a fourth resistor R5, and a fifth resistor R10 connected in series. The input terminal of the third resistor R4 is connected to the display driver IC 110, and the output terminal of the fifth resistor R10 is grounded. The triangular wave module includes a first amplifier T7, a second comparator T8, a capacitor C1, a sixth resistor R6, a seventh resistor R9, an eighth resistor R8, and a ninth resistor R7. The first input terminal of the first amplifier T7 is connected between the third resistor R4 and the fourth resistor R5, and the second input terminal of the first amplifier T7 is connected through the third resistor R4 and the fourth resistor R5 in series. Resistors R6 and R9 are connected to the output of the second comparator T8. The output of the first amplifier T7 is connected to the first input of the second comparator T8 via resistor R8. The first input of the second comparator T8 is also connected to its output via resistor R7. The second input of the second comparator T8 is connected between resistors R4 and R5. The first end of capacitor C1 is connected to the second input of the first amplifier T7, and the second end of capacitor C1 is connected to the output of the first amplifier T7. The first switch K1 is connected in parallel with resistor R9, and the second switch K2 is connected in parallel with resistor R10. When both switches K1 and K2 are on, the triangular wave control circuit 400 sends a first signal to the display driver IC110.

[0063] In this embodiment, when the triangular wave control circuit 400 receives a mode switching command, it can turn off the first switch K1 and the second switch K2, thereby sending a first signal to the display driver IC 110, which accelerates the increase of the duty cycle of the output waveform of the pulse control circuit 112, thereby shortening the adjustment time of the display driver IC 110 for mode switching.

[0064] Optionally, the triangular wave control circuit 400 can output a triangular wave V1. For example... Figure 2 and Figure 4As shown, there is a point c between the third resistor R4 and the fourth resistor R5. The first input terminal of the first amplifier T7 is connected to point c, and the second output terminal of the second comparator T8 is connected to point c. Based on the principle of operational amplifiers, the following formula can be obtained: , , , Where Rcf is the impedance between points c and f, V1H is the maximum output value of V1, and V1L is the minimum output value of V1. Therefore, the peak-to-peak value of the V1 output triangular wave can be obtained as follows: .

[0065] When the output of the second comparator T8 is 0, the current direction is along... Figure 4 As indicated by the middle arrow, capacitor C1 is in charging mode at this time, and the amplitude of the triangular wave V1 can rise from V1L to V1H, with a charging current of i. c , Where Rde is the impedance at points d and e. The rise time of the triangular wave V1 is t r : , Therefore, we can deduce that: , Similarly, when the second comparator T8 outputs ELVDD, the current direction is as follows: Figure 5 As indicated by the middle arrow, capacitor C1 is in discharge mode at this time, the amplitude of the triangular wave V1 decreases from V1H to V1L, and the discharge current is i. d , , , The falling time of the triangular wave V1 is t f Therefore, we can deduce that: .

[0066] Therefore, the period T of the triangular wave V1 is: , The frequency f of the triangular wave V1 is: , The duty cycle D2 of the triangular wave V1 is: .

[0067] As can be seen from the above analysis, the frequency f of the triangular wave V1 can be adjusted by Rde, and the duty cycle D2 of the triangular wave V1 can be adjusted by Rcf. In this embodiment, when the controller sends a mode switching command to the triangular wave control circuit 400, the triangular wave control circuit 400 can turn on the first switch K1 and the second switch K2 according to the mode switching command, so that Rde=R6 and Rcf=R5. At this time, the triangular wave V1 is input to the pulse control circuit 112 in the form of a first triangular wave. The frequency and duty cycle of the first triangular wave increase, and the duty cycle adjustment of the output power supply ELVDD is accelerated, thereby accelerating the mode switching response speed and stabilizing the output power supply ELVDD of the display driver IC 110.

[0068] Furthermore, when the display driver IC110 enters or exits asynchronous mode from synchronous mode, the first switch K1 and the second switch K2 are disconnected, such as... Figure 6 The waveform diagram shown shows that the frequency f of the triangular wave V1 increases and the duty cycle D2 increases. The duty cycle of the output waveform of the pulse control circuit 112 also increases, shortening the adjustment time. The diagram shows the drop amplitude: Vdrop_2 < Vdrop_1, and the duration: t_2 < t_1. Here, ELVDD_1 represents the voltage fluctuation of the output power supply ELVDD in related technologies without a triangular wave control circuit, and ELVDD_2 represents the voltage fluctuation of the output power supply ELVDD in this application with the triangular wave control circuit 400. Therefore, in this embodiment, by adding the triangular wave control circuit 400, the drop amplitude and duration of the output power supply ELVDD of the display driver IC 110 can be reduced by adjusting the duty cycle, thereby achieving a stable output power supply for the display driver IC 110 reaching ELVDD.

[0069] In this embodiment, one input terminal of the mode control circuit 111 is connected to the output terminal of the detection circuit 300, and the other input terminal is connected to the output terminal of the pulse control circuit 112. When entering or exiting asynchronous mode, the controller can send mode switching commands to the detection circuit 300 and the triangular wave control circuit 400, respectively. Specifically, when the detection circuit 300 detects that the first condition is not met and receives the mode switching command, it inputs a second signal to the first input terminal of the mode control circuit 111. When the triangular wave control circuit 400 receives the mode switching command, it closes the first switch K1 and the second switch K2 according to the command and inputs a first triangular wave to the pulse control circuit 112. The pulse control circuit 112 can input a switching signal to the second input terminal of the mode control circuit 111. When the mode control circuit 111 receives both the switching signal and the second signal simultaneously, it can control the mode switching switch Q2 to switch, causing the display driver IC 110 to switch to asynchronous mode or exit asynchronous mode.

[0070] The embodiments of the present invention can be configured differently according to different projects and scenarios, and other resistors can be added for feedback control. The same project can also be adjusted and adapted by software, making the solution system more flexible.

[0071] This application also discloses a schematic diagram of a mode switching process for a display driver IC, the mode switching process including: The detection circuit detects the connection status of the charging IC.

[0072] In this embodiment of the application, by obtaining the connection status of the charging IC, it is convenient to determine whether the input power supply of the display driver IC is in a stable state.

[0073] Optionally, if the input power supply of the display driver IC is in a stable state, it can avoid affecting the stability of the ripple of its output power supply, thereby facilitating the control of the display driver IC to provide a stable power supply to the display screen and reducing the phenomenon of screen flickering in the screen module.

[0074] In this embodiment, the mode switching command can be obtained first, and then the connection status of the charging IC can be detected; or the connection status of the charging IC can be detected first, and then the mode switching command can be obtained; or the mode switching command and the connection status of the charging IC can be obtained simultaneously.

[0075] If the first condition is met, the display driver IC will remain in synchronous mode or asynchronous mode. If the first condition is not met, it is possible to further detect whether the display driver IC receives the first signal. The first condition is that the detection circuit detects that the charging IC is connected to an external charger, and that the first terminal of the charging IC is connected to the third terminal of the charging IC, while the second terminal of the charging IC is disconnected from the third terminal of the charging IC.

[0076] Optionally, under the first condition, the external charger supplies power to the display driver IC, causing the input power supply of the display driver IC to be in an unstable state; if the first condition is not met, the external charger does not supply power to the display driver IC, causing the input power supply of the display driver IC to be in a stable state.

[0077] In this embodiment, when the input power supply of the display driver IC is unstable, it can remain in synchronous or asynchronous mode, which can reduce the risk of screen flickering and ensure the display effect of the screen module.

[0078] If the first condition is not met and the display driver IC receives the first signal, a mode switch can be performed to switch between synchronous and asynchronous modes, allowing the display driver IC to enter the new mode.

[0079] In this embodiment, the display driver IC can switch modes when its input power supply is stable and it receives a first signal. That is, it can switch modes when the input power supply has a low impact on the output power supply's output ripple, which helps to reduce the risk of screen flickering in the screen module and ensure the display effect of the screen module.

[0080] In some alternative embodiments, such as Figure 8 As shown, the mode switching process may further include: Determine if an external charger is plugged into the charging IC; if so, determine the voltage difference between the second and third terminals of the charging IC.

[0081] If the voltage difference is greater than the preset voltage, the display driver IC will be kept in synchronous mode or asynchronous mode.

[0082] If not, then proceed to the normal trigger mode switch.

[0083] Wherein, if the voltage difference is greater than the preset voltage, the first condition is satisfied; if the voltage difference is less than or equal to the preset voltage, the first condition is not satisfied.

[0084] Further detection is performed to check whether the triangular wave control circuit has received a mode switching command. If so, the triangular wave control circuit can turn on the first and second switches to reduce the impedance of Rde and Rcf, thereby enabling the output triangular wave to have a larger frequency and duty cycle. This can accelerate the increase of the duty cycle of the pulse control circuit, thereby enabling the display driver IC to quickly transition to the new mode and achieve the goal of stabilizing the output power supply.

[0085] The electronic device described in this application has at least the following advantages: In the embodiments of this application, the detection circuit can detect the connection status of the charging IC. When the detection circuit detects that the charging IC is connected to an external charger, and the first terminal of the charging IC is connected to the third terminal of the charging IC, and the second terminal of the charging IC is disconnected from the third terminal of the charging IC, the connection status of the charging IC satisfies a first condition. Under the first condition, the display driver IC remains in the synchronous mode or remains in the asynchronous mode. This can restrict the display driver IC from switching modes under the first condition, thereby avoiding scenarios where the input power supply of the display driver IC is unstable when it switches modes, ensuring that the output power supply of the display driver IC can output stable and small ripples, thereby reducing the risk of screen flickering in the screen module and ensuring the display effect of the screen module.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electronic device, characterized in that, include: Power module, including charging IC and battery; The screen module includes a display driver IC and pixel units. The display driver IC is used to power the pixel units and has synchronous and asynchronous modes. The first terminal of the charging IC is used to connect to an external charger, the second terminal of the charging IC is connected to the battery, and the third terminal of the charging IC is connected to the display driver IC. The detection circuit is connected to the charging IC; Under the condition that the first condition is met, the display driver IC remains in the synchronous mode or in the asynchronous mode. The first condition is that the detection circuit detects that the charging IC is connected to an external charger, and that the first terminal of the charging IC is connected to the third terminal of the charging IC, and that the second terminal of the charging IC is disconnected from the third terminal of the charging IC. If the first condition is not met, the display driver IC can switch between the synchronous mode and the asynchronous mode.

2. The electronic device according to claim 1, characterized in that, The detection circuit is connected to the second terminal and the third terminal of the charging IC respectively to detect the voltage difference between the second terminal and the third terminal of the charging IC. The detection circuit satisfies the first condition when it detects that the voltage difference is greater than a preset voltage.

3. The electronic device according to claim 1, characterized in that, The display driver IC includes a mode control circuit and a mode switching switch; The first input terminal of the mode switching switch is connected to the third terminal of the charging IC, the second input terminal of the mode switching switch is connected to the output terminal of the mode control circuit, and the output terminal of the mode switching switch is connected to the pixel unit. The mode control circuit is connected to the detection circuit, and the mode control circuit controls the on / off state of the mode switching switch.

4. The electronic device according to claim 3, characterized in that, The electronic device further includes a triangular wave control circuit, and the display driver IC includes a pulse control circuit. The output terminal of the pulse control circuit is connected to the second input terminal of the mode control circuit; The triangular wave control circuit is connected to the first input terminal of the pulse control circuit; wherein, if the first condition is not met and the triangular wave control circuit sends a first signal to the pulse control circuit, the mode control circuit controls the mode switching switch to switch.

5. The electronic device according to claim 4, characterized in that, The electronic device includes a controller connected to the triangular wave control circuit, and the first signal includes a first triangular wave. When the triangular wave control circuit receives a mode switching command from the controller, it sends the first triangular wave to the pulse control circuit; when it does not receive a mode switching command from the controller, it sends the second triangular wave to the pulse control circuit. The frequency of the first triangular wave is greater than the frequency of the second triangular wave, and the duty cycle of the first triangular wave is greater than the duty cycle of the second triangular wave.

6. The electronic device according to claim 2, characterized in that, The detection circuit includes an extraction module, a first power supply module, and a comparison module; The extraction module is connected to the second terminal and the third terminal of the charging IC respectively, and is used to obtain the voltage difference between the second terminal and the third terminal of the charging IC; The comparison module is connected to the extraction module and the first power supply module respectively, and is used to compare the voltage difference with the preset voltage.

7. The electronic device according to claim 6, characterized in that, The extraction module includes a difference calculator, and the comparison module includes a first comparator. The first input terminal of the difference calculator is connected to the second terminal of the charging IC, and the second input terminal of the difference calculator is connected to the third terminal of the charging IC. The first input terminal of the first comparator is connected to the first power module, and the second input terminal of the first comparator is connected to the output terminal of the difference arithmetic unit.

8. The electronic device according to claim 6, characterized in that, The electronic device includes a controller, and the detection circuit further includes a first logic AND device; The first input terminal of the first logic AND device is connected to the comparison module, the second input terminal of the first logic AND device is connected to the controller, and the output terminal of the first logic AND device is connected to the display driver IC. When the comparison module obtains that the voltage difference is less than or equal to the preset voltage, and the controller sends a mode switching command to the first logic and device, the first logic and device sends a second signal to the display driver IC. The display driver IC switches between the synchronous mode and the asynchronous mode according to the second signal.

9. The electronic device according to claim 6, characterized in that, The first power module includes a first resistor, a second resistor, and a first preset power supply; The first end of the first resistor is connected to the first preset power supply, and the second end of the first resistor is connected to the comparison module; the first end of the second resistor is grounded, and the second end of the second resistor is connected to both the first resistor and the comparison module.

10. The electronic device according to claim 4, characterized in that, The triangular wave control circuit includes a second power module, a first switch, a second switch, and a triangular wave module, wherein the triangular wave module is connected to the display driver IC. The second power module includes a third resistor, a fourth resistor, and a fifth resistor connected in series. The input terminal of the third resistor is connected to the display driver IC, and the output terminal of the fifth resistor is grounded. The triangular wave module includes a first amplifier, a second comparator, a capacitor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor; the first input terminal of the first amplifier is connected between the third resistor and the fourth resistor; the second input terminal of the first amplifier is connected to the output terminal of the second comparator through the sixth and seventh resistors in series; the output terminal of the first amplifier is connected to the first input terminal of the second comparator through the eighth resistor; the first input terminal of the second comparator is connected to its output terminal through the ninth resistor; and the second input terminal of the second comparator is connected between the third resistor and the fourth resistor. The first end of the capacitor is connected to the second input terminal of the first amplifier, and the second end is connected to the output terminal of the first amplifier. The first switch is connected in parallel with the seventh resistor, and the second switch is connected in parallel with the fifth resistor; When both the first switch and the second switch are turned on, the triangular wave control circuit sends a first signal to the display driver IC.

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