US 2026/0245505 A1Published application

Display Device

AssigneeLG Display Co., Ltd.

InventorsJaemin Park, JongBeom Lee, Soyi Lee, Seeun Kim

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Abstract

According to an aspect of the present disclosure, a display device includes a display panel in which a plurality of pixel groups is defined; one PAM circuit disposed in each of the plurality of pixel groups; a plurality of PWM circuits which is disposed in each of the plurality of pixel groups and is connected to one PAM circuit; a plurality of light emitting diodes which is disposed in each of the plurality of pixel groups and is connected to the plurality of PWM circuits. The plurality of PWM circuits is connected to an output terminal of one PAM circuit in parallel in each of the plurality of pixel groups. Accordingly, the plurality of PWM circuits shares one PAM circuit to reduce the number of overall transistors and simplify the structure of the display device.

Claims25

Dependent claims

A display device, comprising:

a display panel including a plurality of pixel groups, each of the plurality of pixel groups including a plurality of light emitting diodes;
a plurality of pulse amplitude modulation (PAM) circuits, each of the plurality of pixel groups including a respective PAM circuit;
and
a set of pulse width modulation (PWM) circuits, wherein a corresponding plurality of PWM circuits from the set are included in each of the plurality of pixel groups and are connected to the respective PAM circuit and connected to the plurality of light emitting diodes included in the pixel group,
wherein in each of the plurality of pixel groups, the corresponding plurality of PWM circuits are connected in parallel to an output terminal of the respective PAM circuit and are connected to the plurality of light emitting diodes included in the pixel group,
wherein in each of the plurality of pixel groups, the respective PAM circuit is configured to supply a driving current with a same intensity to each of the corresponding plurality of PWM circuits.

3 more elements

A display device comprising:

a plurality of light emitting elements that emit a same color of light;
a pulse amplitude modulation (PAM) circuit, the PAM including a first driving transistor that controls an intensity of a driving current that is generated by the PAM circuit based on a first data voltage;
and
a plurality of pulse width modulation (PWM) circuits that are electrically connected to the PAM circuit and receive the driving current generated by the PAM circuit, wherein each of the plurality of PWM circuits includes a second driving transistor that is connected to a corresponding light emitting element from the plurality of light emitting elements,
wherein the second driving transistor is configured to control a duration of time that the driving current from the PAM circuit is supplied to the corresponding light emitting element based on a second data voltage that has a magnitude that is image dependent,
wherein the PAM circuit is configured to supply the driving current with a same intensity to each of the plurality of PWM circuits.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/643,593Filed 9 Apr 2026
Priority: KR 10-2023-016645427 Nov 2023
Published: 20 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G09G 3/32
Using electroluminescent panels: semiconductive, e.g. using light-emitting diodes [LED]
G09G 3/2014
Display of intermediate tones: by modulation of the duration of a single pulse during which the logic level remains constant
G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G09G 2310/08
Command of the display device: details of timing specific for flat panels, other than clock recovery

Family

Application18/912,433Continuation · filed 10 Oct 2024
Application19/643,593Continuation
US 12,620,346 B2Related patent
US 2025/0174178 A1Published application
US 2026/0245505 A1This patent

From the US filing history. Foreign family members aren’t listed.

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