Display Panel Pixel Circuit Ground Path for Through-Hole Brightness

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Solution Overview

Problem

The formation of through holes in display panels for optical electronic devices leads to defects due to charged charges penetrating and causing brightness abnormalities, affecting image quality.

Innovation Solution

A display panel design that includes a pixel circuit with a path to ground for excitation current exit within the pixel, and a light emitting device structure with a bias transistor controlling the connection between the initialization voltage line and the second electrode, providing a path to ground for the excitation current.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If through holes are formed in display areas to install optical electronic devices, then light reception capability is improved, but charged charges penetrate into the interior causing brightness abnormalities and image quality degradation

Engineering Contradiction:
Improvelight reception capabilityVSAvoidbrightness abnormality
Core Design Contradiction:
Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the harmful excitation current from the pixel circuit by providing a dedicated discharge path through the seventh transistor to ground, separating the harmful charge dissipation function from the normal pixel operation, thereby eliminating brightness abnormalities around through holes while maintaining light reception capability

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The seventh transistor acts as an intermediary component that mediates between the pixel circuit and ground, providing a controlled path for excitation current to discharge safely without affecting the light emitting device or other pixel components, thus resolving the brightness abnormality issue

Inventive Principle:
Principle #24Intermediary (Mediator)

2Adaptability or versatility

If through holes are formed in display areas, then camera and detection sensor installation is enabled, but charged charges penetrate causing current increase and brightness phenomenon

Engineering Contradiction:
Improvedetection functionVSAvoidcurrent increase
Core Design Contradiction:
Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts the harmful excitation current from the pixel circuit by providing a dedicated discharge path through the seventh transistor to ground, separating the harmful charge dissipation function from the normal pixel operation, thereby eliminating brightness abnormalities around through holes while maintaining light reception capability

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The seventh transistor is configured to operate during the emission signal period to preemptively discharge excitation current before it can cause harmful effects, applying a counter-action to the charge accumulation problem that prevents rather than merely addresses the current increase issue

Inventive Principle:
Principle #9Preliminary anti-action

Data Source

PatentUS12501773B2Display device for improving displaying quality and display panel thereof
Publication Date: 2025.12.16 LG DISPLAY CO LTD
  • US12501773B2 patent drawing
  • US12501773B2 patent drawing
  • US12501773B2 patent drawing

AI summary

A display panel comprises: a pixel in a display area of the display panel, the pixel including: a light emitting device configured to emit light responsive to a driving current; a driving transistor configured to supply the driving current; and a plurality of switching transistors configured to control the supply of the driving current to the light emitting device by the driving transistor, wherein at least one of the plurality of switching transistors is configured to provide a path to ground through which an excitation current exits within the pixel. Accordingly, it is possible to improve the brightness phenomenon occurring due to an unintentionally increased amount of current in the pixel adjacent to the through hole, thereby the image quality may be improved.