OLED Panel U-Shaped Anode Power Wire for Brightness Uniformity

Solution Overview

Problem

As display resolution increases, the available space in OLED panels decreases, leading to smaller signal wires and significant voltage drops, causing uneven display brightness due to varying anode power supply voltages across pixel driving circuits.

Innovation Solution

The implementation of an organic light emitting display panel with a 'U'-shaped anode power wire structure, where two pixel driving circuits in each sub-pixel column receive anode power supply voltage from opposite extension segments, compensating for voltage drops and ensuring consistent brightness across sub-pixels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the signal wire width is reduced to accommodate higher resolution, then the display resolution is improved, but the voltage drop increases causing uneven display brightness

Engineering Contradiction:

Improvedisplay resolutionVSAvoidvoltage drop

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The anode power wire is segmented into two extension segments (first extension segment and second extension segment) that extend in opposite directions from a central connection point. This segmentation allows the power wire to serve multiple pixel driving circuits more efficiently, reducing the overall voltage drop by distributing the power delivery path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a more balanced voltage distribution by having pixel driving circuits connect to both extension segments. The opposite extension directions ensure that pixel driving circuits at different positions along the column direction experience more equal voltage levels, achieving equipotentiality across the display region.

Inventive Principle:

Principle #12Equipotentiality

2Measurement precision

If the signal wire width is reduced to accommodate higher resolution, then the display resolution is improved, but the display brightness uniformity deteriorates

Engineering Contradiction:

Improvedisplay resolutionVSAvoiddisplay brightness uniformity

Core Design Contradiction:

Measurement precisionVSIllumination intensity

Solution Approach 1:

The anode power wire is segmented into two extension segments (first extension segment and second extension segment) that extend in opposite directions from a central connection point. This segmentation allows the power wire to serve multiple pixel driving circuits more efficiently, reducing the overall voltage drop by distributing the power delivery path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a more balanced voltage distribution by having pixel driving circuits connect to both extension segments. The opposite extension directions ensure that pixel driving circuits at different positions along the column direction experience more equal voltage levels, achieving equipotentiality across the display region.

Inventive Principle:

Principle #12Equipotentiality

3Adaptability or versatility

If the anode power wire extends across the entire display region, then all pixel driving circuits receive power, but the voltage drop causes brightness inconsistency

Engineering Contradiction:

Improvepower supply coverageVSAvoiddisplay brightness uniformity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The anode power wire is segmented into two extension segments (first extension segment and second extension segment) that extend in opposite directions from a central connection point. This segmentation allows the power wire to serve multiple pixel driving circuits more efficiently, reducing the overall voltage drop by distributing the power delivery path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of extending the power wire in a single direction across the display region, the patent inverts the approach by having two segments extend in opposite directions from a central point. This inversion creates a balanced power distribution pattern that mitigates voltage drop effects.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS11374084B2Organic light emitting display panel and display device

Publication Date: 2022.06.28 WUHAN TIANMA MICRO ELECTRONICS CO LTD

AI summary

An organic light emitting display panel and a display device are provided. The organic light emitting display panel includes: an anode power wire, the anode power wire including a first extension segment and a second extension segment, a head end of the first extension segment being electrically connected to the driving power supply, a tail end of the first extension segment being electrically connected to a head end of the second extension segment; each sub-pixel includes a light emitting device and two pixel driving circuits, anode connection terminals of the two pixel driving circuits are electrically connected to an anode of the light emitting device; anode power wire connection terminals of the two pixel driving circuits are electrically connected to the first extension segment and the second extension segment, respectively.