US 11,114,056 B2 · Power voltage generating circuit compensating ripple of a data power voltage and display apparatus including the same

Abstract

A display apparatus includes a display panel, a data driver, a power voltage generator, a driving controller and a timing compensator. The display panel displays an image based on input image data. The data driver outputs a data voltage to the display panel. The power voltage generator outputs a data power voltage to the data driver. The driving controller controls a driving timing of the data driver. The timing compensator changes an output timing of the data voltage of the data driver when a feedback data power voltage is less than a reference data power voltage at a start point of an active period.

Claims18

Dependent claims

A display apparatus comprising:

a display panel which displays an image based on input image data;
a data driver which outputs a data voltage to the display panel;
a power voltage generator which outputs a data power voltage to the data driver;
a driving controller which controls a driving timing of the data driver;
and
a timing compensator which changes an output timing of the data voltage of the data driver when a feedback data power voltage is less than a reference data power voltage at a start point of an active period independent of a data signal from the data driver,
wherein the timing compensator adjusts the output timing of the data voltage such that a start point of outputting the data voltage is in a vertical blank period which is prior to the active period, the vertical blank period and active period being in a same frame.

4 more elements

A power voltage generating circuit comprising:

a capacitor comprising a first electrode directly connected to an input node to which an input voltage is applied and a second electrode connected to a ground;
an inductor comprising a first end portion connected to the input node and a second end portion directly connected to a first node;
a diode comprising an anode electrode connected directly to the first node and a cathode electrode connected to an output node which outputs an output voltage;
a switch comprising a control electrode connected to a switch controller, an input electrode connected directly to the first node and an output node connected to the ground;
a resistor comprising a first end portion connected to the output node and a second end portion connected to a feedback node;
an error amplifier comprising a first input electrode connected to the feedback node, a second input electrode to which a reference voltage is applied and an output electrode;
a comparator comprising a first input electrode connected to the output electrode of the error amplifier, a second input electrode to which a comparison voltage and an output electrode connected to the switch controller;
the switch controller which is connected to the comparator and controls the switch;
and
a timing compensator connected to the feedback node to receive a feedback output voltage, the timing compensator outputs a timing compensating signal according to a level of the feedback output voltage.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/388,231Filed 18 Apr 2019

Priority

KR 10-2018-008254616 Jul 2018

Published

US 2020/0020297 A116 Jan 2020

Granted

7 Sep 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G09G 3/2092
For presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged…:…
G09G 5/003
Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators: details of a display…
G09G 2310/08
Command of the display device: details of timing specific for flat panels, other than clock recovery
G09G 2330/021
Details of power systems and of start or stop of display operation: power management, e.g. power saving

Power voltage generating circuit compensating ripple of a data power voltage and display apparatus including the same

Life of this patent

Power voltage generating circuit compensating ripple of a data power voltage and display apparatus including the same

Life of this patent

Abstract

Claims18