Display Panel Degradation Compensation via Scan Block Current Measurement

Solution Overview

Problem

Existing display devices, particularly organic light emitting display devices, face image quality deterioration due to pixel degradation, which requires complex external compensation methods involving additional circuits and processes, increasing manufacturing costs and design complexity.

Innovation Solution

A method and device that compensates for pixel degradation by measuring current values in scan blocks, determining representative current values, and updating compensation data without the need for an additional circuit, using a simpler control process to reduce manufacturing costs and design complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external compensation method is applied by adding additional transistor and signal line, then pixel degradation compensation is improved, but device complexity increases

Engineering Contradiction:

Improvepixel degradation compensationVSAvoidcircuit configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the compensation function from the pixel circuit itself and implements it at the panel level through a separate compensation module. This separates the compensation logic from the individual pixel transistors, allowing compensation without modifying the basic pixel circuit structure, thus reducing device complexity while maintaining compensation capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent creates a universal compensation module that can compensate for all pixels simultaneously through a single measurement and calculation process. Instead of requiring individual transistor sensing for each pixel, the system uses one representative measurement to derive compensation data for the entire panel, reducing complexity while achieving comprehensive compensation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If external compensation method is applied with additional sensing process, then pixel degradation compensation is improved, but manufacturing cost increases

Engineering Contradiction:

Improvepixel degradation compensationVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent extracts the compensation function from the pixel circuit itself and implements it at the panel level through a separate compensation module. This separates the compensation logic from the individual pixel transistors, allowing compensation without modifying the basic pixel circuit structure, thus reducing device complexity while maintaining compensation capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses a representative scan block to copy the characteristics of all pixels through a single measurement. By measuring one representative scan block and using its data to calculate compensation for the entire panel, the system avoids the need to individually sense each pixel's transistor characteristics, significantly reducing manufacturing complexity and cost.

Inventive Principle:

Principle #26Copying

3Reliability

If external compensation method is applied with complex sensing process, then pixel degradation compensation is improved, but processing time increases

Engineering Contradiction:

Improvepixel degradation compensationVSAvoidcontrol process time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary measurement of a representative scan block before normal operation. By conducting the measurement and calculation in advance, the system prepares compensation data that can be applied immediately during display operation without requiring continuous sensing, thus reducing processing time during actual use.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates a universal compensation module that can compensate for all pixels simultaneously through a single measurement and calculation process. Instead of requiring individual transistor sensing for each pixel, the system uses one representative measurement to derive compensation data for the entire panel, reducing complexity while achieving comprehensive compensation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11222597B2Display device and method for controlling same

Publication Date: 2022.01.11 LG DISPLAY CO LTD

AI summary

Disclosed herein are a display device and a method for controlling the same, and more particularly, to a display device and a method for controlling the same that may compensate degradation of a display panel and may improve image quality. According to the method for controlling the display device of an embodiment, a pattern image is displayed respectively on a plurality of scan blocks set on the display panel. When the pattern image is displayed respectively on the plurality of scan blocks set on the display panel, a current value of each scan block is measured. Then a representative current value is compared with a predetermined reference value, and it is determined whether compensation data of each pixel included in each of the scan blocks is updated.