Display Driver Lookup Table Segmentation for Color Uniformity
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with color shift and non-uniform color temperature due to not considering unique optical characteristics of red, green, and blue image signals, leading to increased power consumption and memory requirements in integrated controllers for data conversion.
Innovation Solution
A drive device with a look-up-table and dithering portion that generates output image signals by storing corrected data, using multipliers, adders, and interpolators to convert and average image signals, reducing memory size and power consumption by optimizing data storage and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the integrated controller performs various data conversion for input image signals to consider unique optical characteristics of each image signal (R, G, B), then the color shift is reduced and color temperature uniformity is improved, but the memory size and power consumption are increased
Solution Approach 1:
The patent segments the data conversion process into multiple stages with different bit depths (8-bit to 10-bit conversion, 8-bit to 9-bit conversion, 8-bit to 6-bit conversion). By dividing the conversion process into stages, the system achieves accurate color correction while reducing the memory capacity required compared to a single large lookup table, thus lowering power consumption.
Solution Approach 2:
The patent introduces a time dimension by using frame memory to store and reuse previously converted data. Instead of performing complete data conversion for every frame, the system stores corrected data in frame memory and reuses it when appropriate, reducing the computational load and power consumption while maintaining color accuracy.
2Manufacturing precision
If the integrated controller performs various data conversion for input image signals to consider unique optical characteristics of each image signal (R, G, B), then the color shift is reduced and color temperature uniformity is improved, but the memory size is increased
Solution Approach 1:
The patent segments the data conversion process into multiple stages with different bit depths (8-bit to 10-bit conversion, 8-bit to 9-bit conversion, 8-bit to 6-bit conversion). By dividing the conversion process into stages, the system achieves accurate color correction while reducing the memory capacity required compared to a single large lookup table, thus lowering power consumption.
Solution Approach 2:
The patent uses frame memory to store corrected data from previous frames and recovers it for reuse in subsequent frames. This allows the system to discard redundant conversion operations and recover previously computed results, significantly reducing the memory size needed for lookup tables while maintaining color accuracy.
3Manufacturing precision
If the integrated controller uses various complicated parts for performing data conversion, then the color temperature uniformity is improved, but the device complexity is increased
Solution Approach 1:
The patent implements a universal data conversion architecture that handles multiple bit depth conversions (8-bit to 10-bit, 8-bit to 9-bit, 8-bit to 6-bit) using the same basic circuit components. This multi-functional approach achieves accurate color correction across different modes while reducing device complexity by avoiding the need for separate dedicated circuits for each conversion type.
Data Source
AI summary
A driving device comprises a look-up-table, a multiplier, an adder, and a dithering portion. The look-up-table stores red and blue colors of corrected image signals and first difference data (f) between input image signals and corrected image signals corresponding to the input image signals. The multiplier converts the input image signals into the same or higher bits of the input image signals. Further, the adder adds the higher bits of the input image signals to the first difference data. Finally, the dithering portion receives corrected image signals and generates output image signals suitable for a data drive portion. According to this configuration, the size of the look-up-table may be reduced and power consumption may be reduced.