Display Panel Image Retention with Color-Selective Transistor Detection

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Solution Overview

Problem

Liquid crystal display panels and organic light emitting diode display panels suffer from ghosting, where previous images persist after content change, degrading the visual experience.

Innovation Solution

A display apparatus and method that includes detecting parameters of driving transistors of subpixels in different colors at varying frequencies, adjusting luminance values to reduce image retention by altering subpixel values, and maintaining total luminance while minimizing color shift.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If uniform detection frequency is applied to all subpixels, then detection process is simple, but image retention cannot be effectively reduced for different color subpixels

Engineering Contradiction:

Improveimage retention reductionVSAvoiddetection frequency control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies different detection frequencies to different color subpixels based on their specific characteristics. Blue subpixels are detected at a higher frequency (e.g., 60Hz) while red and green subpixels are detected at a lower frequency (e.g., 30Hz), optimizing image retention reduction for each color channel individually rather than using a uniform approach

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The detection frequency is made dynamic and adaptive rather than static. The system automatically adjusts detection frequencies based on the displayed content type (static vs. dynamic images) and color channel characteristics, enabling flexible optimization without requiring complex manual configuration

Inventive Principle:

Principle #15Dynamics

2Reliability

If luminance values of all subpixels are adjusted equally, then image retention is reduced, but color balance deteriorates

Engineering Contradiction:

Improveimage retention reductionVSAvoidcolor balance

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Different luminance adjustment strategies are applied to different color subpixels. The blue subpixel luminance is reduced by a different amount compared to red and green subpixels, with each color channel receiving tailored adjustment based on its specific retention characteristics and human visual sensitivity, thereby maintaining overall color balance while reducing image retention

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically changes luminance parameters for different subpixels based on detected image retention levels and content type. By adjusting luminance values as a variable parameter rather than a fixed value, the system can optimize retention reduction while compensating for color balance through coordinated adjustments across multiple parameters

Inventive Principle:

Principle #35Parameter changes

3Reliability

If high detection frequency is used for all subpixels, then image retention is effectively reduced, but energy consumption increases

Engineering Contradiction:

Improveimage retention reductionVSAvoiddetection energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements selective detection frequency assignment where only blue subpixels are detected at high frequency (60Hz) due to their higher susceptibility to image retention, while red and green subpixels are detected at lower frequency (30Hz). This localized approach reduces overall energy consumption compared to uniform high-frequency detection while maintaining effective retention reduction for the most problematic color channel

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of applying high detection frequency to all subpixels (excessive action), the system applies high frequency detection only to the extent necessary for blue subpixels, using lower frequency for other colors where it is sufficient. This partial action approach achieves adequate retention reduction with minimized energy expenditure

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12424167B2Display apparatus, method of displaying image, and computer-program product

Publication Date: 2025.09.23 HEFEI BOE ZHUOYIN TECH CO LTD

AI summary

A display apparatus is provided. The display apparatus includes a display panel; a memory; and one or more processors. The memory stores computer-executable instructions for controlling the one or more processors to detect a region configured to display a static image; in the region configured to display the static image, detect a parameter of driving transistors of subpixels of a first color in first periods, and detect a parameter of driving transistors of subpixels of a second color in second periods; and determine subpixel values of subpixels in a respective pixel in the static image in a respective frame of image comprising the static image. The parameter of driving transistors of subpixels of the first color is detected with a first frequency; the parameter of driving transistors of subpixels of the second color is detected with a second frequency; and the first frequency is higher than the second frequency.