Luminance Compensation Circuit for AMOLED Display Aging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the H+L full-screen display scheme, the aging of AMOLED display panels leads to nonuniform luminance between high-resolution and low-resolution areas, causing current capacity to decrease and resulting in luminance nonuniformity despite Gamma adjustments.
Innovation Solution
A luminance compensation method and circuit that adjust power supply signals and Gamma voltage signals in the display device's pixel regions based on their respective luminance information to maintain uniform luminance, using a driver IC to control power supply and Gamma circuits to adjust voltage and data signals in the first and second pixel regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the H+L full-screen display scheme is used to increase screen-to-body ratio, then the display area is increased, but luminance nonuniformity occurs between high-resolution and low-resolution areas due to aging
Solution Approach 1:
The display panel is divided into two separate pixel regions: a first pixel region with high pixel density (H-area) and a second pixel region with low pixel density (L-area). Each region is equipped with independent power supply signal lines and Gamma voltage signal lines, allowing separate control and compensation of luminance characteristics for each region, thereby resolving the luminance nonuniformity problem while maintaining the increased display area.
Solution Approach 2:
Different power supply voltages and Gamma voltage signals are applied to different pixel regions based on their specific luminance characteristics. The first pixel region receives power supply signals and Gamma voltages optimized for high-resolution display, while the second pixel region receives adjusted signals optimized for low-resolution translucent display, achieving local optimization of luminance uniformity across the entire display panel.
2Reliability
If Gamma adjustments are made to compensate for aging, then luminance uniformity is improved, but the underlying aging issue and current capacity decrease are not addressed
Solution Approach 1:
The system implements luminance detection and feedback mechanisms that continuously monitor the actual luminance output of each pixel region. Based on the detected luminance information and aging characteristics, the control circuit dynamically adjusts the power supply voltages and Gamma voltage signals in real-time, providing continuous compensation for aging effects and extending the display panel's service life while maintaining luminance uniformity.
Solution Approach 2:
The invention changes the electrical parameters (power supply voltages and Gamma voltage signals) applied to the pixel regions based on detected luminance characteristics and aging progression. By dynamically adjusting these parameters rather than using fixed Gamma curves, the system adapts to aging effects and extends the operational lifetime of the display panel while maintaining luminance uniformity.
Data Source
AI summary
A display device, a luminance compensation circuit thereof and a luminance compensation method are provided. In the luminance compensation method, the display device includes a display region and a peripheral region located on a periphery of the display region, where the display region includes a first pixel region and a second pixel region, a pixel density of the second pixel region is lower than a pixel density of the first pixel region; the luminance compensation method includes: adjusting a power supply signal of the first pixel region and/or a power supply signal of the second pixel region, respectively, according to the first light-emitting luminance information of the first pixel region and the second light-emitting luminance information of the second pixel region.