LTPO Pixel Driving Circuit for Low-Gray Line Defect Suppression

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional 8T LTPO pixel driving circuits in display panels suffer from issues of bright and dark lines at low gray values, affecting display quality.

Innovation Solution

Incorporation of a first capacitor between the first and second initial signal lines in the pixel driving circuit to increase the capacitance of the second initial signal line, reducing the coupling effect from the data line and minimizing the occurrence of bright and dark lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional 8T LTPO pixel driving circuit is used, then the display circuit structure is simple and easy to manufacture, but bright and dark lines appear at low gray values affecting display quality

Engineering Contradiction:

Improvedisplay qualityVSAvoidcircuit structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent introduces an initial signal line and associated capacitors as intermediary elements between the data line and the pixel circuit nodes. These intermediaries act as coupling components that transfer and stabilize signals, preventing direct harmful coupling effects that cause bright and dark lines while maintaining the overall 8T circuit structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent adds capacitors connected to initial signal lines that are pre-charged to specific voltages before the pixel circuit operation begins. These pre-charged capacitors serve as cushioning elements that compensate for voltage drops and stabilize the circuit nodes during operation, preventing display defects before they occur.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the capacitance of the second initial signal line is increased by adding a first capacitor, then the anti-coupling ability is enhanced and bright and dark lines are reduced, but the device complexity increases

Engineering Contradiction:

Improveanti-coupling abilityVSAvoidcircuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by adding capacitors specifically to the initial signal lines that are most susceptible to coupling effects, rather than uniformly increasing capacitance throughout the entire circuit. This targeted approach enhances anti-coupling ability where needed while minimizing overall device complexity.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The added capacitor enhances the anti-coupling ability of the second initial signal line, effectively reducing the risk of bright and dark lines in the display panel, thereby improving display quality.

Implementation Method 1

Incorporation of a first capacitor between the first and second initial signal lines in the pixel driving circuit to increase the capacitance of the second initial signal line

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12555523B2Pixel driving circuit and display panel

Publication Date: 2026.02.17 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

An embodiment of the present disclosure is directed to a pixel driving circuit and a display panel. In the pixel driving circuit and display panel, a first capacitor is added between the first initial signal line of the first reset circuit and the second initial signal line of the second reset circuit.