Pixel circuit and display device including the same

By adding switching elements to the pixel circuit of an organic light-emitting display device, the ripple of the low-potential power supply voltage is controlled, solving the image quality problem caused by ripple, achieving more stable pixel brightness and reduced charge residue, and improving the display effect.

CN115602104BActive Publication Date: 2026-06-26LG DISPLAY CO LTD
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LG DISPLAY CO LTD
Filing Date
2022-06-10
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In organic light-emitting display devices, pixel brightness variations and image quality degradation are caused by the ripple of low-potential power supply voltages, especially when crosstalk patterns are generated by the gate conduction voltage between pixels, resulting in line blurring or block blurring.

Method used

The discharge and voltage fluctuations of the light-emitting element are controlled by adding switching elements to the pixel circuit, especially between nodes connected to a low-potential power supply voltage. This includes a first switching element discharging a second node, a second switching element providing a data voltage, a third switching element providing a reference voltage, a fourth switching element providing an initialization voltage, and a fifth switching element providing a pixel drive voltage to suppress ripple of the low-potential power supply voltage.

Benefits of technology

It effectively suppresses the ripple of low-potential power supply voltage, reduces residual charge on the display panel, improves image quality, and prevents brightness variations and blurring between pixels.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN115602104B_ABST
    Figure CN115602104B_ABST
Patent Text Reader

Abstract

A pixel circuit and a display device including the same are disclosed. The pixel circuit of the disclosure includes a driving element including a first electrode connected to a first node to which a pixel driving voltage is applied, a gate electrode connected to a second node, and a second electrode connected to a third node, and configured to provide a current to a light emitting element; a first switching element discharging the second node; and a second switching element configured to provide a data voltage to the second node. The light emitting element and the first switching element are commonly connected to a VSS node to which a low potential power voltage is applied.
Need to check novelty before this filing date? Find Prior Art