Data Compensator for Voltage Drop Correction in OLED Displays
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Solution Overview
Problem
Organic light emitting display devices face image quality degradation due to voltage drops across power and data signal wires, affecting the uniformity and accuracy of pixel operations, which existing compensators do not adequately address.
Innovation Solution
A data compensator that generates reference voltage drops for R, G, and B pixels based on pre-defined relationships, calculates pixel voltage drops, and produces compensation data to correct luminance and color distortions by interpolating block voltage drops, ensuring accurate image representation across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage drop compensation is implemented using existing methods, then power voltage stability is improved, but device complexity increases
Solution Approach 1:
The display panel is divided into multiple blocks (first through M-th blocks in x-direction, first through N-th blocks in y-direction), and voltage drop compensation is performed separately for each block. This segmentation allows the system to manage complexity by breaking down the large-scale compensation problem into smaller, manageable block-level problems, thereby improving power voltage stability without overwhelming device complexity
Solution Approach 2:
The patent uses a pre-stored voltage drop table that contains predetermined voltage drop values for different gray levels. Instead of performing complex real-time calculations, the system copies and applies appropriate voltage drop compensation values from this pre-computed table based on the current gray level, simplifying the compensator structure while maintaining effective power voltage stability
2Manufacturing precision
If detailed pixel-level voltage drop compensation is performed, then image quality is improved, but processing time increases
Solution Approach 1:
By dividing the display panel into blocks and performing voltage drop compensation at the block level rather than individual pixel level, the system achieves a balance between image quality and processing time. Each block's compensation is calculated once and applied to all pixels within that block, reducing redundant calculations while maintaining sufficient image quality
Solution Approach 2:
The patent pre-calculates and stores voltage drop values for different gray levels in a voltage drop table before actual display operation. This preliminary action eliminates the need for complex real-time calculations during image rendering, significantly reducing processing time while still enabling accurate pixel-level compensation when needed
Data Source
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AI summary
A data compensator 100 includes a reference voltage drop generator 130, a voltage drop measurer 140, a compensation data generator 120, and an output block 110. The reference voltage drop generator 130 generates reference voltage drops corresponding to R, G, and B data of a first pixel among the plurality of pixels. The voltage drop measurer 140 calculates pixel voltage drops of the pixels based on R, G, and B data of the pixels and outputs a first pixel voltage drop of the first pixel. The compensation data generator 120 generates R, G, and B compensation data compensating luminance distortion of the first pixel and color coordinate distortion of the first pixel based on a difference between the first pixel voltage drop and the reference voltage drops. The output block 110 generates compensated R, G, and B data by adding the R, G, and B data of the first pixel and the R, G, and B compensation data, respectively.