Display Compensation Circuit for Driving Frequency Fluctuation

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Solution Overview

Problem

Light-emitting display devices face distortion and compensation deviation due to fluctuations in driving frequency, which affect the accurate reflection of product usage time and lead to deterioration of display panel elements.

Innovation Solution

A compensation circuit is implemented to correct accumulation period differences by setting a reference frequency and calculating correction times based on driving frequency fluctuations, ensuring that first and second accumulated data have the same accumulation period, and generating a compensation data signal to address element deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display panel is driven at variable driving frequencies, then the adaptability of the display device is improved, but the accumulation period of accumulated data becomes distorted and compensation deviation occurs

Engineering Contradiction:

Improvedriving frequency adaptabilityVSAvoidaccumulation period accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The compensation circuit pre-calculates correction times for different driving frequencies before data accumulation occurs. By establishing a reference frequency and computing the difference between actual and reference frequencies in advance, the system prepares correction values that will be applied to accumulated data, preventing distortion rather than correcting it afterward.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the accumulation period parameter based on the detected driving frequency. When the driving frequency deviates from the reference frequency, the compensation circuit modifies the accumulation period by adding or subtracting a calculated correction time, thereby maintaining accurate accumulated data across variable driving frequencies.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the accumulation period is not corrected for frequency fluctuation, then the device complexity is reduced, but compensation deviation occurs and element deterioration is not accurately compensated

Engineering Contradiction:

Improvecompensation circuit complexityVSAvoidcompensation accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The compensation circuit continuously detects the actual driving frequency and compares it with the reference frequency to generate feedback. Based on this feedback, the system calculates the frequency difference and applies appropriate correction times to the accumulation period, ensuring that compensation accuracy is maintained through closed-loop control.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The compensation circuit autonomously monitors its own operating conditions by detecting the driving frequency and automatically adjusts the accumulation period without external intervention. The system self-corrects for frequency deviations by computing and applying correction times based on the detected frequency fluctuations.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11769442B2Light-emitting display device preventing occurrence of compensation deviation and driving method thereof

Publication Date: 2023.09.26 LG DISPLAY CO LTD

AI summary

Provided is a light-emitting display apparatus including a display panel configured to display an image, a driving circuit configured to drive the display panel, a timing controller configured to control the driving circuit, and a compensation circuit configured to correct an accumulation period difference of accumulated data to compensate deterioration of an element included in the display panel based on fluctuation of a driving frequency for driving the display panel.