Poly-phase Frame Modulation for 6-bit Display Color Depth
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Solution Overview
Problem
Conventional frame rate control systems for electronic image signals, such as those used in 6-bit TFT display panels, suffer from color loss in high tone colors due to limited sub-level generation, resulting in a reduced number of displayable colors compared to 8-bit systems.
Innovation Solution
A poly-phase frame modulation system employing a 7x7 reference phase matrix with unique elements in each row and column, and additional offsets to generate six color sub-levels between quantization levels, allowing for rearrangement of high tone colors to recover lost levels and avoid visual artifacts like flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frame rate control is applied to a 6-bit display panel, then the perceived color depth is increased, but color loss occurs in high tone colors
Solution Approach 1:
The display area is divided into multiple segments, each with its own phase value from the phase matrix. This segmentation allows different regions to display different sub-levels simultaneously, enabling the generation of multiple color sub-levels between quantization levels without requiring all pixels to follow the same temporal pattern, thereby preserving high tone color information.
Solution Approach 2:
The patent introduces a spatial dimension by using a phase matrix where different spatial positions correspond to different phase values. This transforms the temporal frame rate control into a combined space-time modulation, where color sub-levels are generated through spatial distribution across the display area rather than solely through temporal alternation, thus recovering high tone color levels.
2Quantity of substance
If conventional frame rate control generates sub-levels between quantization levels, then the number of displayable colors increases, but visual artifacts like streaming lines appear
Solution Approach 1:
The phase matrix uses asymmetric phase distribution patterns where each row and column contains unique phase values. This asymmetric arrangement ensures that patterns formed by elements with the same phase values are mutually disjoint, preventing the formation of regular spatial patterns that would manifest as streaming line artifacts while still providing sufficient color sub-levels.
Solution Approach 2:
The patent dynamically adjusts phase values in the phase matrix to optimize the distribution of color sub-levels. By changing phase parameters spatially and temporally, the system generates color sub-levels without creating repetitive visual patterns, thus increasing displayable colors while eliminating streaming line artifacts.
3Device complexity
If a 6-bit display panel uses conventional frame rate control, then the system complexity remains low, but the total number of displayable colors is reduced compared to 8-bit systems
Solution Approach 1:
The phase matrix serves as an intermediary that maps 6-bit display capabilities to effective 8-bit color output. By introducing this intermediate data structure with spatially varying phase values, the system bridges the gap between limited hardware bit depth and desired color output, generating additional color sub-levels through spatial-temporal modulation without requiring hardware upgrades.
Solution Approach 2:
The system uses periodic frame alternation with different phase matrix configurations to generate color sub-levels. By cycling through different phase arrangements in successive frames, the display creates the perception of additional color levels through temporal averaging, effectively increasing displayable colors while maintaining simple 6-bit hardware.
Data Source
AI summary
A poly-phase frame modulation system includes a phase matrix look-up table being configured for generating a reference phase matrix; a first phase modulator being configured for generating a first modulated output by taking in the data from a red channel and the sum of the reference phase matrix and a frame offset; a second phase modulator being configured for generating a second modulated output by taking in the data from a green channel and the sum of the reference phase matrix, the frame offset and a first channel offset; and a third phase modulator being configured for generating a third modulated output by taking in the data from a blue channel and the sum of the reference phase matrix, the frame offset and a second channel offset.