Power Management Device and Display Device Including the Same
AssigneeSilicon Works Co., Ltd.
InventorsGeon Soo Jang, Hyung Sub Kim, Jung Hyun Tark
Life of this patent
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Abstract
The present disclosure relates to a technology for a power management device applied to a display device, in which driving voltages having different levels are supplied to driving devices having different sizes of load in different times, and this allows all of the driving devices to stably receive voltages within a limited range even though the number of driving devices increases according to the enlargement of a display panel.
Claims18
A display device comprising:
- at least one driving device configured to transmit data voltages to pixels disposed on a panel in a display time section and to transmit touch driving signals to the sensors disposed in the panel in a touch sensing time section;
- a power management device connected with the at least one driving device through a power supply line and configured to supply a first voltage having a first level to the power supply lines in the display time section and to supply a second voltage having a second level higher than the first level to the power supply line in the touch sensing time section;
- and
- a timing control device configured to supply a timing control signal indicating the display time section and the touch sensing time section to the at least one driving device or to the power management device.
A power management device connected with display driving devices through a power supply line, the power management device comprising:
- a first voltage generation module configured to generate a first voltage having a first level;
- a second voltage generation module configured to generate a second voltage having a second level higher than the first level;
- and
- an output control circuit configured to receive a timing control signal indicating a display time section and a touch sensing time section, to output, through switch circuits, the first voltage to the power supply line in the display time section and the second voltage to the power supply line in the touch sensing time section.
A power management device connected to display driving devices through a power supply line, the power management device comprising:
- a gate control circuit configured to turn on or off a power switch configured to adjust voltages of both ends of an inductor for power conversion;
- a feedback loop circuit configured to generate a comparison signal by comparing a sensing voltage for an output with a reference and to transmit a control signal for the gate control circuit according to the comparison signal;
- and
- a control circuit configured to control the reference to correspond to a first voltage in a display time section and to control the reference to correspond to a second voltage higher than the first voltage in a touch sensing time section or to control the sensing voltage to correspond to the first voltage in the display time section and to control the sensing voltage to correspond to the second voltage in the touch sensing time section.
Dependencies are inferred from the claim text.