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Power supply circuit, display screen, electronic equipment and power supply control method
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A technology for power supply circuits and electronic equipment, which is applied in the electrical field and can solve problems such as flickering screens
Active Publication Date: 2021-12-07
VIVO MOBILE COMM CO LTD
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Abstract
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[0003] The purpose of the embodiment of the present application is to provide a power supply circuit, a display screen, an electronic device and a power supply control method, which can solve the problem that the current power supply circuit that supplies power to the pixel circuit may cause a flickering screen when it obtains power through a charging device
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Embodiment 1
[0095] Embodiment one: see Figure 4 The power supply circuit shown; the power supply control method of the embodiment of the present application, such as Figure 8 shown, including:
[0096] Step 810: In the standby or power-off state, when the AMOLED screen is not on, a key operation is received to trigger the generation of a screen-on event.
[0097] Step 811: The voltage detection module 13 detects the voltage difference V between VPH_PWR and ELVDD d =V ELVDD -V VPH_PWR .
[0098] Step 812: Set V d with preset threshold V th (eg 0.1V) compare if V d less than or equal to V th , then go to step 813; otherwise go to step 822.
[0099] Step 813: The control module 16 controls Q1 and Q2 to turn on and off alternately, and raise the voltage of ELVDD_MID to V ELVDD +V drop .
[0100] Step 814: The control module 16 controls the mode switch module 12 (that is, the LDO / BYPASS switch module) to switch to the LDO mode.
[0101] Step 815 : Output ELVDD voltage, and retur...
Embodiment 2
[0104] Embodiment two: see Figure 6 The power supply circuit shown; the power supply control method of the embodiment of the present application, such as Figure 9 shown, including:
[0105] Step 910: In the standby or power-off state, when the AMOLED screen is not on, a key operation is received to trigger the generation of a screen-on event.
[0106] Step 911: The voltage detection module 13 detects the voltage difference V between VPH_PWR and ELVDD d =V ELVDD -V VPH_PWR .
[0107] Step 912: Set V d with preset threshold V th (eg 0.1V) compare if V d less than or equal to V th ,, go to step 913; otherwise go to step 922.
[0108] Step 913: The control module 16 controls Q1, turns off Q2, and turns on Q3.
[0109] Step 914: The control module 16 controls the mode switching module 12 (that is, the LDO / BYPASS switching module) to switch to the LDO mode.
[0110] Step 915 : output the ELVDD voltage, and return to step 911 .
[0111] Step 922: The control module 16 c...
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Abstract
The invention discloses a power supply circuit, a display screen, electronic equipment and a power supply control method, and belongs to the technical field of electricity. The power supply circuit comprises a voltage conversion module, a mode switching module and a voltage detection module, the first power supply, the voltage conversion module, the mode switching module and the pixel circuit are connected in sequence; the voltage detection module is connected with the voltage conversion module and the mode switching module, and is used for detecting the first voltage of the input end of the voltage conversion module and the second voltage of the output end of the mode switching module. When the difference value between the first voltage and the second voltage is greater than a preset threshold value, the voltage conversion module outputs a target voltage, and the mode switching module outputs the target voltage in a straight-through mode; when the difference value between the first voltage and the second voltage is smaller than or equal to a preset threshold value, the voltage conversion module outputs a third voltage, and the mode switching module is in a voltage stabilization mode and outputs a target voltage; the third voltage is greater than the target voltage.
Description
technical field [0001] The application belongs to the field of electrical technology, and in particular relates to a power supply circuit, a display screen, electronic equipment and a power supply control method. Background technique [0002] The pixel circuit has a positive power supply terminal (ELVDD) and a negative power supply terminal (ELVSS), and the pixel circuit can be powered by the power supply circuit connected to ELVDD and ELVSS. For example: the power supply circuit for ELVDD can obtain electric energy when the electronic device is charged by the charging device. The voltage at the terminal rises; when the voltage at the output of the power supply circuit reaches the threshold value, the voltage at the output of the ELVDD power supply circuit will drop, and the voltage (Vgs) between the source and gate of the transistor in the pixel circuit may jitter, while the Vgs Voltagejitter affects the LED current (Iled), which can cause flickering problems. Contents ...
Claims
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Application Information
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