Active Matrix Display Power Line Segmentation for Voltage Drop Balance

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Solution Overview

Problem

Active matrix display devices experience uneven luminance due to unbalanced voltage drops across power lines, which can be exacerbated by sharing power lines among pixel columns, leading to increased load and voltage drop variations.

Innovation Solution

The implementation of a greater number of first power lines compared to second power lines, with first power lines supplying a power supply voltage and second power lines supplying a different initialization voltage, helps to balance voltage drops across power lines without compromising layout efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If power lines are shared among pixel columns to improve layout efficiency, then the number of power lines is reduced and layout efficiency is improved, but the load on power lines increases and voltage drop becomes unbalanced

Engineering Contradiction:

Improvelayout efficiencyVSAvoidvoltage drop balance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The power line system is segmented into two distinct types: first power lines for power supply voltage and second power lines for initialization voltage. This segmentation allows each type of power line to be optimized independently for its specific function, preventing the voltage drop imbalance that would result from a unified shared power line approach.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different power lines are assigned different numbers based on their specific functions and current requirements. The first power lines (power supply) and second power lines (initialization) have different quantities tailored to their respective current loads, ensuring that each power line operates within optimal parameters and voltage drop remains balanced across the display panel.

Inventive Principle:

Principle #3Local quality

2Reliability

If the number of first power lines is increased compared to second power lines, then voltage drop balance is improved, but device complexity increases

Engineering Contradiction:

Improvevoltage drop balanceVSAvoidpower line configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Both first and second power lines follow the same extended layout pattern in the pixel column direction, providing a universal structural approach. This multi-functional design allows the same basic power line architecture to serve two different voltage supply purposes, reducing overall device complexity while maintaining voltage drop balance through differential numbering.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10614755B2Active matrix display device for reducing unbalanced voltage drop

Publication Date: 2020.04.07 MAGNOLIA BLUE CORP

AI summary

A display device includes a plurality of pixels arranged in rows and columns, a plurality of first power lines that extend in a pixel column direction and through which a power supply voltage is supplied to the pixels, and a plurality of second power lines that extend in the pixel column direction and through which an initialization voltage different from the power supply voltage is to the pixels. The number of first power lines is greater than the number of second power lines.