AMOLED IR Drop Compensation via Zone-Wise Linear Adjustment
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Solution Overview
Problem
As AMOLED display panels increase in size and resolution, IR drop along the power line causes voltage division, leading to uneven brightness across the display, resulting in poor image homogeneity when displaying pure color images.
Innovation Solution
An AMOLED IR drop compensation system that divides the display panel into zones, using an image detection module, data signal correction module, and IR drop compensation module to perform zone-wise linear compensation by adjusting the data signal of each sub-pixel based on calculated IR drop variations, ensuring consistent brightness across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size and resolution of AMOLED display panels are increased, then the display quality and coverage area are improved, but the impedance of the power line increases causing greater IR drop and voltage division, leading to poor image homogeneity
Solution Approach 1:
The patent divides the display panel into multiple zones along the power line direction. Each zone is assigned a compensation coefficient based on its position and the calculated IR drop. This segmentation allows different regions to receive tailored compensation, addressing the voltage division problem caused by increased panel area and impedance.
Solution Approach 2:
The patent calculates IR drop values for different zones and determines compensation coefficients by changing the data signal parameters (voltage levels) according to position. By adjusting the data signal parameters zone-by-zone, the system compensates for impedance-induced voltage division and maintains image homogeneity across large display areas.
2Length of stationary object
If the length of the power line is increased to accommodate larger display panels, then the display area is expanded, but the impedance increases causing greater voltage division and non-uniform brightness across pixels
Solution Approach 1:
The patent performs preliminary calculation of IR drop values for each zone before displaying images. Compensation coefficients are pre-determined based on the power line impedance and expected current distribution. This preliminary action allows the system to proactively compensate for brightness non-uniformity rather than reacting to it after it occurs.
Solution Approach 2:
The patent implements a feedback mechanism where the displayed image is analyzed to detect pure color regions, and compensation is applied based on the calculated IR drop characteristics. This feedback loop allows continuous adjustment of compensation coefficients to maintain brightness uniformity across the extended power line length.
3Measurement precision
If higher resolution is implemented in AMOLED panels, then the image quality is improved, but the number of pixels and power line length increase, resulting in greater impedance and IR drop causing uneven brightness
Solution Approach 1:
The patent segments the high-resolution display panel into multiple zones along the power line direction. Each zone receives compensation tailored to its position, allowing the system to manage the increased impedance from higher resolution without compromising brightness uniformity. The segmentation approach scales with resolution requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively compensates IR drop, ensuring homogeneous image quality by adjusting the data signal of each sub-pixel, thereby overcoming the issue of uneven brightness and improving display homogeneity when showing pure color images.
Implementation Method 1
Organic light emitting diode (OLED) display devices have various advantages, including being self-luminous
Data Source
AI summary
The present invention provides an AMOLED IR drop compensation system and method. The AMOLED IR drop compensation system includes an AMOLED display panel that is divided into a plurality of zones, an image detection module, a data signal correction module, and an IR drop compensation module and may achieve zone-wise linear compensation for IR drop. The AMOLED IR drop compensation method includes dividing an AMOLED display panel in a direction of extension of a power line into a plurality of zones, applying an image detection module to detect a data signal of an image to be displayed and determine if the image to be displayed is a pure color image, applying a data correction module to convert the data signal of a pure color image to be displayed, and applying an IR drop compensation module to conduct zone-wise linear IR drop compensation for each of the plurality of zones by adjusting the variation of the data signal of each of the sub-pixels of each of the zones of the AMOLED display panel. The present invention can effectively compensate IR drop and overcome the problem of the image quality being not homogeneous caused by IR drop when an AMOLED display panel is displaying a pure color image.