Display Device Color Space Expansion via Saturation-Based Coefficient Calculation
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Solution Overview
Problem
Existing display devices that expand color space by including a white sub pixel require additional memory to store maximum lightness values, leading to increased IC size and cost, and may cause display problems when using alternative methods to determine expansion coefficients.
Innovation Solution
A display device with an expanded video signal generation unit and an expansion coefficient decision unit that calculates expansion coefficients based on inverse saturation for pixels with saturation above a threshold and a quadratic function for pixels with saturation below a threshold, eliminating the need for storing expansion coefficients corresponding to each saturation level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If maximum lightness values are stored in memory for each saturation level to enable color space expansion, then color space expansion capability is improved, but IC size and manufacturing cost increase
Solution Approach 1:
The patent extracts the need for storing maximum lightness values by deriving expansion coefficients through calculation based on saturation levels and luminance characteristics. Instead of storing pre-computed values in memory, the system calculates them on-demand using mathematical relationships, thereby removing the memory storage requirement while maintaining color space expansion capability.
Solution Approach 2:
The system performs self-service by automatically calculating expansion coefficients using the saturation information already present in the input signal and luminance characteristics of the display device. This eliminates the need for external memory storage, as the coefficients are generated dynamically through mathematical operations on existing data.
2Adaptability or versatility
If maximum lightness values are stored in memory for color space expansion, then color space expansion capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the requirement for additional memory components by extracting the expansion coefficient values through calculation. This eliminates the need for extra memory chips or storage elements, directly reducing manufacturing costs while preserving the color space expansion functionality.
Solution Approach 2:
Instead of using expensive permanent memory storage for expansion coefficients, the system uses temporary computational values derived from existing signal data. These calculated coefficients exist only during processing and do not require permanent storage infrastructure, reducing manufacturing expenses.
3Area of stationary object
If alternative methods are used to determine expansion coefficients without storing maximum lightness values, then IC size is reduced, but display problems such as killer pattern may occur
Solution Approach 1:
The patent implements feedback by using the saturation information from the input signal to dynamically adjust the expansion coefficient calculation. The system continuously monitors saturation levels and adjusts coefficients accordingly, ensuring display quality is maintained while avoiding the killer pattern effect. This feedback mechanism replaces the need for pre-stored maximum lightness values.
Solution Approach 2:
The system changes parameters by deriving expansion coefficients as dynamic values based on saturation levels and luminance characteristics rather than using fixed pre-stored values. This parameter transformation maintains display reliability by adapting coefficients to actual signal conditions while reducing IC size through elimination of memory storage.
4Loss of energy
If field-sequential color system is used instead of color filter system, then light use efficiency is improved, but color space expansion requires additional fields increasing complexity
Solution Approach 1:
The patent applies multi-functionality by using the same saturation information from the input video signal for both driving the field-sequential display and calculating expansion coefficients. This dual-purpose approach maintains light efficiency while enabling color space expansion without requiring additional display fields or increasing system complexity.
Solution Approach 2:
The saturation signal acts as an intermediary that bridges the field-sequential display control and the color space expansion calculation. By using this intermediate parameter, the system achieves both light efficiency and color space expansion without needing separate control mechanisms, thereby avoiding increased complexity.
Data Source
AI summary
A signal processing circuit comprising: a signal separation unit separating an input video signal into components of individual colors; an expanded video signal generation unit performing an expansion process for increasing a signal value of the input video signal, and outputting data obtained by the expansion process as an expanded video signal; an expansion coefficient decision unit deciding an expansion coefficient to be used for the expansion process; and an output video signal generation unit generating an output video signal for output to the display panel based on the expanded video signal. The expansion coefficient decision unit decides the inverse of the saturation as the expansion coefficient for a pixel, at which the saturation is not smaller than a predetermined value, and decides the expansion coefficient based on a quadratic function.