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US 12,763,659 B2Granted
DC-DC converter and display device including the DC-DC converter, and electronic device including the display device
AssigneeSamsung Display Co., Ltd.
InventorsSungchun Park, Jeongmin Seo
Life of this patent
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Abstract
A DC-DC converter includes a first switching element, a second switching element connected to the first switching element, an inductor connected to the first switching element and the second switching element, and a switching controller configured to generate a switching control signal for turning on the first switching element or the second switching element in response to a switching control clock signal, to reset the switching control signal in response to a reset signal, and to operate in a low power mode or a normal mode according to a load, which is a panel current, based on a threshold current. The threshold current is adjusted based on the switching control signal.
Claims13
A DC-DC converter for generating a panel power voltage using an input voltage, comprising:
- a first switching element;
- a second switching element connected to the first switching element;
- an inductor connected to the first switching element and the second switching element;
- and
- a switching controller configured to generate a switching control signal for turning on the first switching element or the second switching element in response to a switching control clock signal, to reset the switching control signal in response to a reset signal, and to operate in a low power mode or a normal mode according to a load, which is a panel current, based on a threshold current,
- wherein the threshold current is adjusted based on the switching control signal,
- wherein the DC-DC converter is configured to adjust the threshold current by adjusting a minimum on-time of the switching control signal,
- wherein the DC-DC converter further comprises a first skip comparator, a second skip comparator, and a logical sum circuit,
- wherein the first skip comparator is configured to generate a first skip signal,
- wherein the second skip comparator is configured to compare a sum voltage including information on an inductor current flowing in the inductor with a control voltage to generate a second skip signal,
- wherein the logical sum circuit is configured to perform a logical sum operation on the first skip signal and the second skip signal to generate the reset signal, and
- wherein the reset signal is generated based on the first skip signal and the second skip signal.
9 more elements
A display device, comprising:
- a display panel including pixels;
- and
- a DC-DC converter configured to generate a panel power voltage using an input voltage to provide to the display panel,
- wherein the DC-DC converter includes:
- a first switching element;
- a second switching element connected to the first switching element;
- an inductor connected to the first switching element and the second switching element;
- and
- a switching controller configured to generate a switching control signal for turning on the first switching element or the second switching element in response to a switching control clock signal, to reset the switching control signal in response to a reset signal, and to operate in a low power mode or a normal mode according to a load, which is a panel current, based on a threshold current, and
- wherein the threshold current is adjusted based on the switching control signal,
- wherein the DC-DC converter is configured to adjust the threshold current by adjusting a minimum on-time of the switching control signal,
- wherein the DC-DC converter further comprises a first skip comparator, a second skip comparator, and a logical sum circuit,
- wherein the first skip comparator is configured to generate a first skip signal,
- wherein the second skip comparator is configured to compare a sum voltage including information on an inductor current flowing in the inductor with a control voltage to generate a second skip signal,
- wherein the logical sum circuit is configured to perform a logical sum operation on the first skip signal and the second skip signal to generate the reset signal, and
- wherein the reset signal is generated based on the first skip signal and the second skip signal.
13 more elements
An electronic device, comprising:
- a display panel including pixels;
- a DC-DC converter configured to generate a panel power voltage using an input voltage to provide to the display panel;
- and
- a power supply configured to provide a power to the display panel and the DC-DC converter,
- wherein the DC-DC converter includes:
- a first switching element;
- a second switching element connected to the first switching element;
- an inductor connected to the first switching element and the second switching element;
- and
- a switching controller configured to generate a switching control signal for turning on the first switching element or the second switching element in response to a switching control clock signal, to reset the switching control signal in response to a reset signal, and to operate in a low power mode or a normal mode according to a load, which is a panel current, based on a threshold current, and
- wherein the threshold current is adjusted based on the switching control signal,
- wherein the DC-DC converter is configured to adjust the threshold current by adjusting a minimum on-time of the switching control signal,
- wherein the DC-DC converter further comprises a first skip comparator, a second skip comparator, and a logical sum circuit,
- wherein the first skip comparator is configured to generate a first skip signal,
- wherein the second skip comparator is configured to compare a sum voltage including information on an inductor current flowing in the inductor with a control voltage to generate a second skip signal,
- wherein the logical sum circuit is configured to perform a logical sum operation on the first skip signal and the second skip signal to generate the reset signal, and
- wherein the reset signal is generated based on the first skip signal and the second skip signal.
14 more elements
Dependencies are inferred from the claim text.