Shared Common Electrode Pixel Driving Circuit for OLED Resolution

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The miniaturization of pixel circuits is essential for higher resolution OLED displays, as they require more pixels within a fixed display panel size, and existing designs do not efficiently reduce the size of pixel driving circuits while maintaining performance.

Innovation Solution

The pixel driving circuit array incorporates a plurality of capacitors that share a common electrode, reducing the size of the pixel driving circuits and allowing for increased display resolution, aperture ratio, and more pixels in a fixed area by optimizing the layout of capacitors and transistors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If more pixels are required for higher resolution in a fixed display panel size, then display resolution is improved, but pixel circuit size must be reduced which increases device complexity

Engineering Contradiction:

Improvedisplay resolutionVSAvoidpixel circuit size

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges two separate capacitors (first capacitor and second capacitor) into a shared capacitor structure. The first electrode of the first capacitor and the second electrode of the second capacitor are merged into a single shared electrode, reducing the total number of capacitor components from four to three (two electrodes plus shared electrode), thereby reducing pixel circuit area while maintaining dual-capacitor functionality for grayscale control

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared electrode serves dual functions: it acts as the second electrode for the first capacitor and simultaneously as the first electrode for the second capacitor. This multi-functional design allows a single electrode structure to fulfill the storage requirements of two separate capacitors, enabling higher resolution displays with reduced pixel circuit complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If pixel circuit size is reduced for higher resolution, then display resolution is improved, but aperture ratio may be reduced which affects light emission efficiency

Engineering Contradiction:

Improvedisplay resolutionVSAvoidaperture ratio

Core Design Contradiction:

Measurement precisionVSIllumination intensity

Solution Approach 1:

The patent extends the shared electrode along the horizontal direction to increase its surface area. By expanding the electrode in the horizontal dimension rather than increasing vertical stacking, the design maintains a compact pixel footprint while providing sufficient capacitance storage area, thus preserving aperture ratio even as pixel size is reduced for higher resolution

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS8723183B2Image display system having pixels with common electrodes

Publication Date: 2014.05.13 RED OAK INNOVATIONS LTD

AI summary

A pixel driving circuit array is disclosed, comprising a first capacitor and a second capacitor. The first capacitor comprises a first electrode, an insulator layer and a common electrode. The second capacitor comprises a second electrode, the insulator layer and the common electrode. The first capacitor and the second capacitor share the same common electrode. The first electrode and the second electrode are on the same plane.