OLED power supply screen driving module

Abstract

The utility model discloses an OLED power supply screen driving module, comprising a BUCK circuit module and a BUCK-BOOST circuit module which are built between an MCU and an OLED display screen based on two IC chips, the power supply voltage output by the BUCK circuit module to the OLED display screen is a positive voltage, the power supply voltage output by the BUCK-BOOST circuit module to the OLED display screen is a negative voltage, the BUCK-BOOST circuit module is a positive voltage, and the BUCK-BOOST circuit module is a negative voltage. According to the utility model, through the non-integrated power supply driving IC, the cost can be reduced, the universality of materials is better, and the power consumption requirement of the whole system is met.

Description

Technical Field

[0001] The utility model relates to an OLED power screen driving module. Background Art

[0002] OLED display screens are widely used in vehicle-mounted screens due to their advantages such as high contrast ratio, wide viewing angle, fast response, and flexible design.

[0003] Originally, OLED display screens were first used in the consumer field. Most of their OLED power drivers use integrated IC driver chips, which are efficient, reliable, occupy little space, can provide multiple functions such as step-down and negative voltage, and improve the display effect and service life. However, the integrated power IC has a high cost, limited design flexibility, and usually does not have high-power driving ability, which may limit its application in special requirements under the large size and high power consumption demands of vehicle-mounted screens. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the disadvantages and deficiencies existing in the prior art, and to provide an OLED power screen driving module.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an OLED power screen driving module, including a BUCK circuit module and a BUCK-BOOST circuit module built between an MCU and an OLED display screen based on two IC chips. The power supply voltage output by the BUCK circuit module to the OLED display screen is a positive voltage, and the power supply voltage output by the BUCK-BOOST circuit module to the OLED display screen is a negative voltage.

[0006] As a preferred technical solution of the utility model, the BUCK circuit module includes a control IC, a switching transistor Q1, a diode D1, an inductor L1, and a capacitor C1. The BUCK circuit module includes a positive electrode line and a ground line. The switching transistor Q1 and the inductor L1 are connected in series and electrically connected to the positive electrode line of the BUCK circuit module. The positive electrode of the diode D1 is connected to the ground terminal of the BUCK circuit module, and the negative electrode of the diode D1 is connected between the switching transistor Q1 and the inductor L1.

[0007] As a preferred technical solution of the utility model, the switching transistor Q1 is an NMOS transistor.

[0008] As a preferred technical solution of the present utility model, the BUCK-BOOST circuit module includes a BUCK-BOOST circuit and a control signal conversion circuit. The BUCK-BOOST circuit includes a control IC, a switching transistor Q2, a diode D2, an inductor L2, and a capacitor C2. The switching transistor Q2 and the inductor L2 are connected in series. The negative electrode of the diode D2 is connected to the positive electrode of the inductor L2. The positive terminal of the diode D2 is connected to the capacitor C2. The other end of the capacitor is grounded.

[0009] As a preferred technical solution of the present utility model, the switching transistor Q2 is an NMOS transistor.

[0010] As a preferred technical solution of the present utility model, the control signal conversion circuit includes a switching transistor Q3, a switching transistor Q4, a resistor R1, and a resistor R2. The switching transistor Q4 and the resistor R1 are connected in parallel to the switching transistor Q3. The switching transistor Q3 is connected to the operating power supply voltage through the resistor R1. The switching transistor Q4 is connected to the common ground terminal voltage through the resistor R2.

[0011] As a preferred technical solution of the present utility model, the switching transistor Q3 is an NMOS transistor, and the switching transistor Q4 is a PMOS transistor.

[0012] In summary, the beneficial effects of the present utility model are as follows:

[0013] The OLED screen power driving module uses two IC chips of the same model to build a positive voltage BUCK circuit module and a negative voltage BUCK-BOOST circuit module, which respectively provide +4.6V and -7.8V driving power for the OLED display screen. When the OLED display screen is powered on, the MCU enables EN1 and EN2 according to the specified timing. For the BUCK circuit: Among them, EN1 directly enables the output positive voltage BUCK circuit module. At this time, the PWM outputs a switching signal to the switching transistor Q1. The inductor L1 is used as an energy storage device. When the switching transistor Q1 is turned on, the current passes through the inductor L1 and outputs to the load terminal. When the switching transistor Q1 is turned off, the inductor L1 generates an induced electromotive force to stably output the voltage. The capacitor C1 is a filtering device, mainly filtering the ripple generated by the switching power supply to ensure the stability of the output voltage. The Feedback signal is mainly used to feedback the output voltage to the control IC to control the dynamic adjustment of the PWM signal to the output voltage to ensure the accuracy of the output voltage.

[0014] For the BUCK-BOOST circuit:

[0015] Control signal conversion: Since the negative voltage circuit is built using a BUCK circuit and the chip reference ground is negative voltage, EN2 needs to pass through a control signal conversion circuit and then be output to the negative voltage BUCK - BOOST circuit module after conversion. When EN2 outputs a high level, the switching transistor Q3 conducts. At this time, the switching transistor Q4 conducts, and the voltage of EN3 input to the control IC is the voltage obtained by dividing the working power supply voltage through resistors R1 and R2. When EN2 outputs a low level, the switching transistors Q3 and Q4 turn off, and the input voltage of EN3 is the voltage of the common ground terminal, which is equivalent to 0V for the control IC. The control IC works to output PWM to control the switching of the switching transistor Q2. The inductor L2 is used as an energy storage device. When the switching transistor Q2 conducts, the inductor L2 stores energy. When the switching transistor Q2 turns off, the inductor L2 generates an induced electromotive force to transfer energy to the load. The capacitor C2 is a filtering device, mainly filtering out the ripple generated by the switching power supply to ensure the stability of the output voltage. Description of the Drawings

[0016] Figure 1 is the circuit schematic diagram of the OLED power screen driving module of the present utility model;

[0017] Figure 2 is the circuit schematic diagram of the BUCK circuit of the present utility model;

[0018] Figure 3 is the circuit schematic diagram of the BUCK - BOOST circuit of the present utility model. Detailed Embodiments

[0019] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the following combines specific embodiments and drawings to further elaborate the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor all belong to the protection scope of the present utility model.

[0020] The following describes the specific embodiments of the present utility model with reference to the drawings.

[0021] As Figures 1-3 shown, an OLED power screen driving module includes a BUCK circuit module and a BUCK - BOOST circuit module built between the MCU and the OLED display screen based on two IC chips. The power supply voltage output by the BUCK circuit module to the OLED display screen is a positive voltage, and the power supply voltage output by the BUCK - BOOST circuit module to the OLED display screen is a negative voltage. The IC chip in this embodiment is a BUCK chip.

[0022] The BUCK circuit module includes a control IC, a switching transistor Q1, a diode D1, an inductor L1, and a capacitor C1. The BUCK circuit module includes a positive line and a ground line. The switching transistor Q1 and the inductor L1 are connected in series and electrically connected to the positive line of the BUCK circuit module. The positive electrode of the diode D1 is connected to the ground terminal of the BUCK circuit module, and the negative electrode of the diode D1 is connected between the switching transistor Q1 and the inductor L1. In this embodiment, the switching transistor Q1 is an NMOS transistor.

[0023] The BUCK - BOOST circuit module includes a BUCK - BOOST circuit and a control signal conversion circuit. The BUCK - BOOST circuit includes a control IC, a switching transistor Q2, a diode D2, an inductor L2, and a capacitor C2. The switching transistor Q2 and the inductor L2 are connected in series. The negative electrode of the diode D2 is connected to the positive electrode of the inductor L2, and the positive terminal of the diode D2 is connected to the capacitor C2. The other end of the capacitor is grounded. In this embodiment, the switching transistor Q2 is an NMOS transistor.

[0024] The control signal conversion circuit includes a switching transistor Q3, a switching transistor Q4, a resistor R1, and a resistor R2. The switching transistor Q4 and the resistor R1 are connected in parallel to the switching transistor Q3. The switching transistor Q3 is connected to the operating power supply voltage through the resistor R1, and the switching transistor Q4 is connected to the common ground terminal voltage through the resistor R2. In this embodiment, the switching transistor Q3 is an NMOS transistor, and the switching transistor Q4 is a PMOS transistor.

[0025] Working principle:

[0026] The OLED screen power driving module uses two IC chips of the same model to build a positive - voltage BUCK circuit module and a negative - voltage BUCK - BOOST circuit module, which respectively provide +4.6V and -7.8V driving power for the OLED display screen. When the OLED display screen is powered on, the MCU enables EN1 and EN2 according to the specified timing. For the BUCK circuit: Among them, EN1 directly enables the output of the positive - voltage BUCK circuit module. At this time, the PWM outputs a switching signal to the switching transistor Q1. The inductor L1 is used as an energy - storage device. When the switching transistor Q1 is turned on, the current passes through the inductor L1 and outputs to the load terminal. When the switching transistor Q1 is turned off, the inductor L1 generates an induced electromotive force to stably output the voltage. The capacitor C1 is a filtering device, mainly filtering the ripple generated by the switching power supply to ensure the stability of the output voltage. The Feedback signal is mainly used to feed back the output voltage to the control IC to control the dynamic adjustment of the PWM signal for the output voltage to ensure the accuracy of the output voltage.

[0027] For the BUCK - BOOST circuit:

[0028] Control signal conversion: Since the negative voltage circuit is built using a BUCK circuit and the reference ground of the chip is negative voltage, EN2 needs to pass through a control signal conversion circuit and be converted before being output to the negative voltage BUCK-BOOST circuit module. When EN2 outputs a high level, the switching transistor Q3 conducts, and at this time, the switching transistor Q4 conducts. The voltage of EN3 input to the control IC is the voltage obtained by dividing the working power supply voltage VDD by resistors R1 and R2. When EN2 outputs a low level, the switching transistors Q3 and Q4 are turned off, and the input voltage of EN3 is the voltage of the common ground terminal ELVSS, which is equivalent to 0V for the control IC. The control IC works to output PWM to control the switching of the switching transistor Q2. The inductor L2 is used as an energy storage device. When the switching transistor Q2 conducts, the inductor L2 stores energy. When the switching transistor Q2 is turned off, the inductor L2 generates an induced electromotive force to transfer the energy to the load. The capacitor C2 is a filtering device, mainly filtering out the ripples generated by the switching power supply to ensure the stability of the output voltage.

[0029] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An OLED power screen driving module, characterized in that: It includes a BUCK circuit module and a BUCK-BOOST circuit module built between the MCU and the OLED display screen based on two IC chips. The power supply voltage output by the BUCK circuit module to the OLED display screen is a positive voltage, and the power supply voltage output by the BUCK-BOOST circuit module to the OLED display screen is a negative voltage.

2. The OLED power screen driving module according to claim 1, characterized in that: The BUCK circuit module includes a control IC, a switch tube Q1, a diode D1, an inductor L1 and a capacitor C1. The BUCK circuit module includes a positive line and a ground line. The switch tube Q1 and the inductor L1 are connected in series and the wire is connected to the positive line of the BUCK circuit module. The positive electrode of the diode D1 is connected to the ground end of the BUCK circuit module, and the negative electrode of the diode D1 is connected between the switch tube Q1 and the inductor L1.

3. The OLED power screen driving module according to claim 2, characterized in that: The switch tube Q1 is an NMOS tube.

4. The OLED power screen driving module according to claim 1, characterized in that: The BUCK-BOOST circuit module includes a BUCK-BOOST circuit and a control signal conversion circuit. The BUCK-BOOST circuit includes a control IC, a switch tube Q2, a diode D2, an inductor L2 and a capacitor C2. The switch tube Q2 and the inductor L2 are connected in series, the cathode of the diode D2 is connected to the anode of the inductor L2, the anode terminal of the diode D2 is connected to the capacitor C2, and the other end of the capacitor is grounded.

5. The OLED power screen driving module according to claim 4, characterized in that: The switch tube Q2 is an NMOS tube.

6. The OLED power screen driving module according to claim 4, characterized in that: The control signal conversion circuit includes a switch tube Q3, a switch tube Q4, a resistor R1, and a resistor R2. The switch tube Q4 and the resistor R1 are connected in parallel to the switch tube Q3. The switch tube Q3 is connected to the working power supply voltage through the resistor R1, and the switch tube Q4 is connected to the common ground terminal voltage through the resistor R2.

7. The OLED power screen driving module according to claim 6, characterized in that: The switch tube Q3 is an NMOS tube, and the switch tube Q4 is a PMOS tube.

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