CN-122026559-A - Power supply circuit and display device

CN122026559ACN 122026559 ACN122026559 ACN 122026559ACN-122026559-A

Abstract

The application belongs to the technical field of display driving, and particularly relates to a power supply circuit and a display device, wherein the power supply circuit is applied to the display device, the display device comprises a display panel and a flip-chip film plate, the circuit comprises a photovoltaic cell, the photovoltaic cell is arranged between a black matrix area of the display panel and a light-transmitting substrate and is configured to generate initial power supply voltage through backlight received by the light-transmitting substrate, a voltage conversion module is arranged on the flip-chip film plate and is configured to convert the initial power supply voltage into target power supply voltage, a voltage output module is arranged on the flip-chip film plate and is configured to control the voltage conversion module to output the target power supply voltage to a load power supply end when the voltage output by the voltage conversion module is larger than or equal to a preset voltage threshold value, and control an external power supply end to output the target power supply voltage to the load power supply end when the voltage output by the voltage conversion module is smaller than the preset voltage threshold value.

Inventors

SHI JUN
YANG TINGTING
JIANG RUI
DENG HONGCAI
WANG LUN
YE LIDAN

Assignees

惠科股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (10)

1. The power supply circuit is characterized by being applied to a display device, wherein the display device comprises a display panel and a flip chip film plate, and the circuit comprises: A photovoltaic cell disposed between the black matrix region of the display panel and the light-transmitting substrate, configured to generate an initial power supply voltage through a backlight received by the light-transmitting substrate; the voltage conversion module is arranged on the flip-chip film plate and comprises a voltage conversion unit and a rectification unit, wherein the voltage conversion unit is connected with the photovoltaic cell, and the rectification unit is connected with the voltage conversion unit; The voltage conversion unit is configured to charge or discharge according to a rectification signal so as to convert an initial power supply voltage output by the photovoltaic cell into a target power supply voltage; The rectification unit is configured to generate the rectification signal according to current transformation of the voltage conversion unit; The voltage output module is arranged on the flip-chip film plate, is connected with the voltage conversion module, the external power supply end and the load power supply end of the flip-chip film plate, and is configured to control the voltage conversion module to output the target power supply voltage to the load power supply end when the voltage output by the voltage conversion module is greater than or equal to a preset voltage threshold value, and control the external power supply end to output the target power supply voltage to the load power supply end when the voltage output by the voltage conversion module is less than the preset voltage threshold value.
2. The power supply circuit of claim 1, wherein the voltage output module comprises: The voltage judging unit is connected with the voltage conversion module and is configured to judge the magnitude between the voltage output by the voltage conversion module and the preset voltage threshold value and obtain a judging result; the power supply switching unit is respectively connected with the voltage judging unit, the external power supply end and the load power supply end and is configured to control the voltage converting module to output the target power supply voltage to the load power supply end when the judging result indicates that the voltage output by the voltage converting module is greater than or equal to the preset voltage threshold value, and control the external power supply end to output the target power supply voltage to the load power supply end when the judging result indicates that the voltage output by the voltage converting module is less than the preset voltage threshold value.
3. The power supply circuit according to claim 2, wherein the voltage judging unit includes a first resistor, a second resistor, and a first field effect transistor; The first end of the first resistor is respectively connected with the voltage conversion module and the first end of the first field effect transistor, and the second end of the first resistor is respectively connected with the first end of the second resistor, the power supply switching unit and the control end of the first field effect transistor; the second end of the second resistor is connected with the power supply switching unit and grounded; the second end of the first field effect transistor is connected with the power supply switching unit.
4. The power supply circuit according to claim 2, wherein the power switching unit includes a first transistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a second transistor, a second field effect transistor, and a seventh resistor; the control end of the first triode is connected with the voltage judging unit, the first end of the first triode is respectively connected with the second end of the third resistor and the first end of the fourth resistor, and the second end of the first triode is respectively connected with the second end of the fifth resistor, the second end of the second triode and the second end of the seventh resistor and grounded; The first end of the third resistor is connected with the external power supply end, the first end of the sixth resistor and the first end of the second field effect transistor; The second end of the fourth resistor is respectively connected with the control end of the second triode and the first end of the fifth resistor; the first end of the second triode is respectively connected with the second end of the sixth resistor and the control end of the second field effect tube; And the second end of the second field effect transistor is respectively connected with the first end of the seventh resistor and the load power supply end.
5. The power supply circuit of claim 1, wherein the voltage conversion unit comprises a first inductor, a second diode, a first capacitor, and an eighth resistor; The first end of the first inductor is connected with the photovoltaic cell, and the second end of the first inductor is connected with the anode of the second diode; the cathode of the second diode is respectively connected with the first end of the first capacitor and the first end of the eighth resistor; the second end of the first capacitor is connected with the second end of the eighth resistor and grounded.
6. The power supply circuit according to claim 1, wherein the rectifying unit includes a second capacitor, a third transistor, a ninth resistor, and a fourth transistor; The first end of the second capacitor is respectively connected with the voltage conversion unit and the first end of the third triode, and the second end of the second capacitor is respectively connected with the control end of the fourth triode and the first end of the ninth resistor; the control end of the third triode is connected with the second end of the fourth triode, and the second end of the third triode is grounded; The first end of the fourth triode is connected with the voltage conversion unit; the second end of the ninth resistor is grounded.
7. The power supply circuit of claim 1, wherein the voltage conversion module further comprises: The voltage stabilizing unit is connected with the voltage converting unit and is configured to generate a voltage stabilizing signal according to the voltage output by the voltage converting unit; the rectification unit is also connected with the voltage stabilizing unit and is further configured to generate the rectification signal according to the voltage stabilizing signal.
8. The power supply circuit according to claim 7, wherein the voltage stabilizing unit comprises a fifth triode, a tenth resistor, a third diode, and a fourth diode; The control end of the fifth triode is respectively connected with the second end of the tenth resistor and the negative electrode of the third diode, the first end of the fifth triode is respectively connected with the voltage conversion unit and the first end of the tenth resistor, and the second end of the fifth triode is connected with the positive electrode of the fourth diode; the positive electrode of the third diode is grounded; and the cathode of the fourth diode is connected with the rectifying unit.
9. The power supply circuit of claim 1, further comprising a third capacitor, wherein the third capacitor is connected in parallel with the output of the photovoltaic cell.
10. A display device comprises a display panel and a flip chip film plate, and is characterized by further comprising the power supply circuit according to any one of claims 1 to 9, wherein a photovoltaic cell of the power supply circuit is arranged between a black matrix area of the display panel and a light-transmitting substrate, and a voltage conversion module and a voltage output module of the power supply circuit are arranged on the flip chip film plate.

Description

Power supply circuit and display device Technical Field The application belongs to the technical field of display driving, and particularly relates to a power supply circuit and a display device. Background In related art, in display devices such as televisions, vehicle-mounted displays, mobile terminals, etc., a backlight module will generate backlight, a black matrix area is disposed between pixels in a display panel for absorbing the backlight, and the backlight will not be effectively utilized after the black matrix area is absorbed, and the energy of the portion of backlight will be completely wasted. Therefore, how to realize the energy recovery of the backlight is a current urgent problem to be solved. Disclosure of Invention The application provides a power supply circuit and a display device, which solve the problem of energy waste of backlight. The application provides a power supply circuit which is applied to a display device, the display device comprises a display panel and a flip-chip film plate, the circuit comprises a photovoltaic cell, a voltage conversion module and a rectification unit, the photovoltaic cell is arranged between a black matrix area of the display panel and a light-transmitting substrate and is configured to generate initial power supply voltage through backlight received by the light-transmitting substrate, the voltage conversion module is arranged on the flip-chip film plate and comprises a voltage conversion unit and a rectification unit, the voltage conversion unit is connected with the photovoltaic cell and is connected with the voltage conversion unit, the voltage conversion unit is configured to charge or discharge according to the rectification signal so as to convert initial power supply voltage output by the photovoltaic cell into target power supply voltage, the rectification unit is configured to generate the rectification signal according to current transformation of the voltage conversion unit, the voltage output module is arranged on the flip-chip film plate and is connected with the voltage conversion module, an external power supply end and a load power supply end of the flip-chip film plate, and is configured to control the voltage conversion module to output the target power supply voltage when the voltage output by the voltage conversion module is larger than or equal to a preset voltage, and the voltage conversion module is controlled to output to the target power supply end when the voltage output by the voltage conversion module is smaller than the preset voltage conversion end. The voltage output module comprises a voltage judging unit, a power supply switching unit and a power supply switching unit, wherein the voltage judging unit is connected with the voltage converting module and is configured to judge the magnitude between the voltage output by the voltage converting module and the preset voltage threshold value and obtain a judging result, the power supply switching unit is respectively connected with the voltage judging unit, the external power supply end and the load power supply end and is configured to control the voltage converting module to output the target power supply voltage to the load power supply end when the judging result indicates that the voltage output by the voltage converting module is greater than or equal to the preset voltage threshold value and control the external power supply end to output the target power supply voltage to the load power supply end when the judging result indicates that the voltage output by the voltage converting module is less than the preset voltage threshold value. The voltage judging unit comprises a first resistor, a second resistor and a first field effect transistor, wherein the first end of the first resistor is connected with the voltage conversion module and the first end of the first field effect transistor respectively, the second end of the first resistor is connected with the first end of the second resistor, the power switching unit and the control end of the first field effect transistor respectively, the second end of the second resistor is connected with the power switching unit and grounded, and the second end of the first field effect transistor is connected with the power switching unit. The power supply switching unit comprises a first triode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a second triode, a second field effect transistor and a seventh resistor, wherein the control end of the first triode is connected with the voltage judging unit, the first end of the first triode is respectively connected with the second end of the third resistor and the first end of the fourth resistor, the second end of the first triode is respectively connected with the second end of the fifth resistor, the second end of the second triode and the second end of the seventh resistor and grounded, the first end of the third resistor is connected with the external powe