Bendable Display Panel Segmentation for IR Drop Reduction

Solution Overview

Problem

Folding OLED displays experience a significant IR drop due to line resistances in VDD signal lines, leading to uneven display brightness and reduced refresh frequency.

Innovation Solution

A bendable display panel design with non-bending areas and bending areas, where the GOA driving circuit is divided to independently control scan, reset, and enable signals, and VDD and data signals, reducing the overall length of VDD signal lines and improving display uniformity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the GOA area is extended to cover the entire long side of the panel, then the scanning signals can be provided to all pixel driving circuits, but the line resistance of VDD signal lines increases causing more obvious IR drop phenomenon

Engineering Contradiction:

Improvecoverage of GOA areaVSAvoidIR drop phenomenon

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The display panel is divided into multiple non-bending areas separated by bending areas. Each non-bending area has its own GOA driving circuit that independently controls the display area within that region. This segmentation reduces the length of VDD signal lines in each segment, thereby reducing the IR drop phenomenon while maintaining comprehensive scanning signal coverage across the entire display panel.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the GOA area is extended accordingly, then the scanning signals can reach all areas, but the refresh frequency of the folding OLED display is reduced

Engineering Contradiction:

Improvesignal coverageVSAvoidrefresh frequency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The display panel is divided into multiple non-bending areas separated by bending areas. Each non-bending area has its own GOA driving circuit that independently controls the display area within that region. This segmentation reduces the length of VDD signal lines in each segment, thereby reducing the IR drop phenomenon while maintaining comprehensive scanning signal coverage across the entire display panel.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If VDD signal lines are extended across the entire panel, then power can be supplied to all pixel driving circuits, but voltage drops along the lines causing difference in display brightness

Engineering Contradiction:

Improvepower distribution coverageVSAvoiddisplay brightness uniformity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The display panel is divided into multiple non-bending areas separated by bending areas. Each non-bending area has its own GOA driving circuit that independently controls the display area within that region. This segmentation reduces the length of VDD signal lines in each segment, thereby reducing the IR drop phenomenon while maintaining comprehensive scanning signal coverage across the entire display panel.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11200848B2Bendable display panel, bendable display apparatus, and bendable display device

Publication Date: 2021.12.14 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The present disclosure provides a bendable display panel, a bendable display apparatus, and a bendable display device. The bendable display panel includes at least two non-bending areas, and at least one bending area disposed between two adjacent non-bending areas. Opposite sides of the at least one bending area are electrically connected to the adjacent non-bending areas respectively to form an integrated structure, wherein each of the at least two non-bending areas includes a display area provided with a gate array driving circuit, and a non-display area disposed at a periphery of the display area, the non-display area provided with an opening at a position corresponding to the at least one bending area.