Circuit for inhibiting delayed starting of OLED screen
By introducing a delay control circuit into the OLED screen driving circuit, the output voltage is delayed to avoid excessive voltage, which solves the overvoltage problem of the power supply unit in the early stage of power-on startup, and improves the reliability of the product.
Patent Information
- Application Number
- CN202323374990.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-12
AI Technical Summary
In the driving circuit design of the OLED screen, the overvoltage phenomenon of the power supply unit in the early stage of power-on start-up leads to the risk of poor display, affecting the reliability of the screen.
Design a circuit including a power supply unit, a power conversion IC circuit and a delay control circuit. The delay control circuit is connected in parallel to the output end of the power conversion IC circuit, and the output voltage is delayed through the capacitor and resistor components to apply after the OLED screen signal is stabilized. Voltage, avoid excessive voltage effects.
It effectively suppresses excessive voltage during power supply unit startup, improves the reliability of the OLED screen, and reduces the risk of the product in the application field.
Smart Images
Figure CN222190261U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of OLED screens, and in particular to a circuit for suppressing delayed start-up of an OLED screen. Background Art
[0002] In the driving circuit design of the OLED screen, at the initial power-on startup, the buffer circuit in the power supply unit has not yet entered the normal working state, resulting in excessive overvoltage on certain devices in the power supply unit or the power module, which greatly increases the risk of poor display of the OLED screen. Utility Model Content
[0003] The utility model aims to provide a circuit for suppressing delayed startup of an OLED screen, so as to suppress the generation of excessively high voltage when a power supply unit is started with high efficiency and low cost.
[0004] To achieve the above purpose, the utility model provides the following solutions:
[0005] A circuit for suppressing delayed startup of an OLED screen, comprising: a power supply unit, a power conversion IC circuit, an OLED screen and a delay control circuit;
[0006] One end of the delay control circuit is connected to the output end of the power conversion IC circuit and the OLED screen respectively, and the other end of the delay control circuit is connected to the power supply unit;
[0007] The delay control circuit is connected in parallel to the output end of the power conversion IC circuit. At the moment the power is turned on, under the action of the delay control circuit, the output voltage of the power conversion IC circuit is delayed; after the signal of the OLED screen is stable, the output voltage of the power conversion IC circuit is applied to the OLED screen.
[0008] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects:
[0009] The circuit for suppressing delayed startup of an OLED screen provided by the utility model can efficiently and cost-effectively suppress the generation of excessively high voltage when a power supply unit is started, thereby preventing the OLED screen from being affected by high voltage, thereby making the product more reliable in the application field. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0011] Figure 1 A circuit diagram of a circuit for suppressing delayed startup of an OLED screen provided by the utility model;
[0012] Figure 2 It is a schematic diagram of the simulation result of the voltage of the OLED screen signal without applying the delay control circuit;
[0013] Figure 3 A schematic diagram of the simulation results of the voltage of the OLED screen signal using a delay control circuit. DETAILED DESCRIPTION
[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0015] The utility model aims to provide a circuit for suppressing delayed startup of an OLED screen, so as to suppress the generation of excessively high voltage when a power supply unit is started with high efficiency and low cost.
[0016] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0017] like Figure 1 As shown, the circuit for suppressing delayed startup of an OLED screen provided by the utility model includes: a power supply unit, a power conversion IC circuit, an OLED screen and a delay control circuit.
[0018] One end of the delay control circuit is connected to the output end of the power conversion IC circuit and the OLED screen respectively, and the other end of the delay control circuit is connected to the power supply unit.
[0019] The power supply unit supplies power to each circuit module; the power conversion IC circuit provides the high voltage required for the OLED screen display; the OLED screen is a display device; the delay control circuit controls the power conversion IC circuit to output a high voltage under specific time conditions.
[0020] The delay control circuit is connected in parallel to the output end of the power conversion IC circuit. At the moment the power is turned on, under the action of the delay control circuit, the output voltage of the power conversion IC circuit is delayed; after the signal of the OLED screen is stable, the output voltage of the power conversion IC circuit is applied to the OLED screen.
[0021] Furthermore, the delay control circuit includes: a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3 and a capacitor C; the source of the transistor Q2 and one end of the resistor R3 are both connected to the output end of the power conversion IC circuit, the drain of the transistor Q2 is connected to the OLED screen, the gate of the transistor Q2 is connected to the other end of the resistor R3 and the drain of the transistor Q1, the gate of the transistor Q1 is respectively connected to one end of the resistor R2, one end of the resistor R1 and one end of the capacitor C, the source of the transistor Q1 is respectively connected to the other end of the resistor R2, the other end of the capacitor C and the ground; the other end of the resistor R1 is connected to the power supply unit.
[0022] In the delay control circuit, the capacitor C and the resistor R1 satisfy: r1*c>Ts; where r1 represents the resistance value of the resistor R1, c represents the capacitance value of the capacitor C, and Ts represents the required time for each signal of the OLED screen to stabilize, which is 5ms in this embodiment. In this embodiment, the capacitor value c=1uF and the resistor value r=10k, so the condition r1*c>Ts=5mS can be satisfied. Figure 2-Figure 3 It can be seen that after using the delay control circuit, the voltage fluctuation amplitude of the OLED screen signal becomes smaller.
[0023] After the power is supplied, under the action of resistor R1 and capacitor C, the U of Q1 transistor G The voltage rises slowly. When the U G Than U S When the transistor Q1 is turned on, the transistor Q2's U S The terminal voltage is equal to the output voltage (VOUT) of the power conversion IC circuit; when the transistor Q1 is turned on, the U G Than U S The transistor Q2 is turned on, and the output voltage (VOUT) of the power conversion IC circuit is applied to the OLED screen. Due to the charging time of the resistor R1 and the capacitor C r1*C>Ts=5ms, the voltage of the OLED screen signal will not be affected by the output high voltage of the power conversion IC circuit during this time.
[0024] The delay control circuit does not affect the output voltage of the power conversion IC circuit; the delay control circuit does not affect the voltage output speed of the power conversion IC circuit.
[0025] The utility model can efficiently and cost-effectively suppress the generation of excessively high voltage when the power supply unit is started, thereby avoiding the influence of high voltage on the OLED screen, thereby making the product more reliable in the application field.
[0026] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.
Claims
1. A circuit for inhibiting delayed startup of an OLED screen, characterized in that: include: Power supply unit, power conversion IC circuit, OLED screen and delay control circuit; One end of the delay control circuit is connected to the output end of the power conversion IC circuit and the OLED screen respectively, and the other end of the delay control circuit is connected to the power supply unit; The delay control circuit is connected in parallel to the output end of the power conversion IC circuit. At the moment the power is turned on, under the action of the delay control circuit, the output voltage of the power conversion IC circuit is delayed; after the signal of the OLED screen is stable, the output voltage of the power conversion IC circuit is applied to the OLED screen.
2. The circuit for suppressing delayed start of an OLED screen according to claim 1, characterized in that: The delay control circuit includes: a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3 and a capacitor C; The source of the transistor Q2 and one end of the resistor R3 are both connected to the output end of the power conversion IC circuit, the drain of the transistor Q2 is connected to the OLED screen, the gate of the transistor Q2 is connected to the other end of the resistor R3 and the drain of the transistor Q1, the gate of the transistor Q1 is respectively connected to one end of the resistor R2, one end of the resistor R1 and one end of the capacitor C, the source of the transistor Q1 is respectively connected to the other end of the resistor R2, the other end of the capacitor C and the ground; the other end of the resistor R1 is connected to the power supply unit.
3. The circuit for suppressing delayed start of an OLED screen according to claim 2, characterized in that: The capacitor C and the resistor R1 satisfy: r1*c>Ts; wherein r1 represents the resistance value of the resistor R1, c represents the capacitance value of the capacitor C, and Ts represents the required time for each signal of the OLED screen to be stable.
4. The circuit for suppressing delayed start of an OLED screen according to claim 1, characterized in that: The delay control circuit does not affect the output voltage of the power conversion IC circuit.
5. The circuit for suppressing delayed start of an OLED screen according to claim 1, characterized in that: The delay control circuit does not affect the voltage output speed of the power conversion IC circuit.