Data Compensation Device for Display Voltage Drop Correction
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Solution Overview
Problem
Display devices face challenges in achieving higher performance due to voltage drop issues across bus and array points, which affect the accuracy and efficiency of data compensation.
Innovation Solution
A data compensation device and display device are designed to calculate average currents and provide compensation data based on bus voltage drop and array voltage drop information, using a current calculator, voltage drop info provider, data compensation circuit, and adder to enhance performance by accounting for voltage drops across predetermined points in the pixel array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage drop compensation is not implemented, then device complexity is low, but manufacturing precision deteriorates due to voltage drops affecting pixel array performance
Solution Approach 1:
The patent pre-calculates and stores voltage drop values for multiple bus points and array points in lookup tables before operation. During actual operation, the compensation device simply retrieves pre-computed compensation data based on current block information, rather than performing complex real-time calculations. This preliminary preparation resolves the contradiction by enabling precise voltage drop compensation without adding significant operational complexity.
Solution Approach 2:
The patent divides the pixel array into multiple blocks and calculates average current for each block separately. Compensation data is generated specifically for each block based on its local voltage drop characteristics, rather than applying a uniform compensation approach. This localized approach improves manufacturing precision for each block while keeping the overall device complexity manageable through modular processing.
2Manufacturing precision
If real-time voltage drop calculation is performed for each pixel, then manufacturing precision improves, but productivity deteriorates due to computational complexity
Solution Approach 1:
The patent pre-computes voltage drop values for multiple bus points and array points and stores them in lookup tables during a setup phase. During actual pixel array operation, the system retrieves pre-calculated compensation data based on the current block's average current, rather than performing complex voltage drop calculations for each pixel in real-time. This resolves the contradiction by achieving high precision through advance preparation without sacrificing processing speed during operation.
Solution Approach 2:
The patent segments the pixel array into multiple blocks and processes each block independently. For each block, it calculates a single average current value and retrieves corresponding compensation data, rather than performing individual pixel-level calculations. This segmentation reduces computational complexity from O(N) per pixel to O(1) per block, dramatically improving productivity while maintaining precision through block-level compensation.
3Productivity
If block-level average current calculation is used, then productivity improves by reducing computations, but measurement precision deteriorates compared to pixel-level measurement
Solution Approach 1:
The patent applies different levels of measurement precision to different aspects of the problem. It uses block-level average current measurement (lower precision but higher productivity) for determining compensation data selection, while maintaining pixel-level precision in the lookup tables through accurate pre-computation of voltage drop values. This resolves the contradiction by matching measurement precision to the required accuracy level for each computational stage.
Solution Approach 2:
The patent pre-computes and stores accurate voltage drop values for multiple bus points and array points in lookup tables during setup. These pre-computed values capture the precise voltage drop characteristics that would otherwise require pixel-level measurement. During operation, block-level average current calculation efficiently selects the appropriate pre-computed compensation data, resolving the contradiction between productivity and measurement precision by shifting precision requirements to the preliminary preparation phase.
Data Source
AI summary
A data compensation device includes a current calculator which calculates an average current of each of blocks included in a pixel array based on an input data, a data enable signal, a horizontal synchronization signal and a vertical synchronization signal, a voltage drop info provider which provides a bus voltage drop information of predetermined bus points and an array voltage drop information of predetermined array points, the bus points being included in a power supply bus wiring which is connected to the pixel array, the array points being included in the pixel array, a data compensation circuit configured to provide a compensation data corresponding to the input data based on the average current, the bus voltage drop information and the array voltage drop information, and an adder configured to provide a compensation result data by adding the input data and the compensation data.