Flexible OLED Display Substrate Crack Detection Circuit

Solution Overview

Problem

Flexible OLED display panels are prone to cracking during the cutting process, leading to packaging invalidation and display abnormalities, and existing detection methods using a single circuit cause interference and uneven brightness due to resistance differences in signal lines.

Innovation Solution

A display substrate with a peripheral region containing a crack detection line, data detection lines, and display screen detection elements, which allow for independent crack detection and pure color picture detection without interference, using transistors and control signal lines to manage signal transmission and emission states of subpixels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single circuit is used for detection, then device complexity is reduced, but measurement precision deteriorates due to interference and uneven brightness

Engineering Contradiction:

Improvedetection circuit complexityVSAvoiddetection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The detection circuit is divided into two independent parts: a crack detection circuit with crack detection elements connected to crack detection lines, and a display screen detection circuit with display screen detection elements connected to data detection lines. This segmentation eliminates interference between crack detection and display screen detection, allowing each circuit to perform its specific function without affecting the other, thus improving measurement precision while maintaining manageable device complexity.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If crack detection and display screen detection share the same circuit, then device complexity is reduced, but reliability deteriorates due to interference

Engineering Contradiction:

Improvedetection circuit complexityVSAvoiddetection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The detection circuit is divided into two independent parts: a crack detection circuit with crack detection elements connected to crack detection lines, and a display screen detection circuit with display screen detection elements connected to data detection lines. This segmentation eliminates interference between crack detection and display screen detection, allowing each circuit to perform its specific function without affecting the other, thus improving measurement precision while maintaining manageable device complexity.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If data detection lines are used for crack detection, then device complexity is reduced, but manufacturing precision deteriorates due to resistance differences

Engineering Contradiction:

Improvedetection circuit complexityVSAvoidbrightness uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The detection circuit is divided into two independent parts: a crack detection circuit with crack detection elements connected to crack detection lines, and a display screen detection circuit with display screen detection elements connected to data detection lines. This segmentation eliminates interference between crack detection and display screen detection, allowing each circuit to perform its specific function without affecting the other, thus improving measurement precision while maintaining manageable device complexity.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12183230B2Display substrate, detection method therefor, and display device

Publication Date: 2024.12.31 BEIJING BOE TECH DEV CO LTD

AI summary

A display substrate, a detection method, and a display device. The display substrate includes: a substrate, including a display region and a peripheral region surrounding the display region; multiple subpixels, multiple data lines, arranged in the display region; a first control signal line, a second control signal line, a crack detection line, and at least one data detection line, arranged in the peripheral region, and the crack detection line is provided around the display region; multiple display screen detection units, arranged in the peripheral region, configured to transmit, according to a control signal provided by the first control signal line, a detection signal provided by the at least one data detection line to at least one of the multiple data lines; multiple crack detection units, arranged in the peripheral region.