Data Driving Circuit with Independent Gamma Compensation
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Solution Overview
Problem
Existing data driving circuits are incompatible with various sub-pixel arrangement structures, leading to degraded image quality when a common gamma compensation voltage is applied, particularly affecting color representation in display devices.
Innovation Solution
A data driving circuit is designed with multiple voltage divider circuits and digital-to-analog converters (DACs) for each color, allowing for independent gamma compensation voltage generation and application, enabling compatibility with different sub-pixel arrangements without degrading image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common gamma compensation voltage is applied to the data driving circuit, then the circuit design is simplified, but image quality is degraded in some colors
Solution Approach 1:
The patent divides the single gamma compensation voltage into separate gamma compensation voltages for each color channel (R, G, B). Each color channel has its own voltage divider circuit that generates color-specific gamma compensation voltages, allowing independent optimization of gamma characteristics for each color to prevent image quality degradation.
Solution Approach 2:
The patent applies different gamma compensation voltages to different color channels based on their specific characteristics. Each color channel receives a locally optimized gamma compensation voltage that matches its emission characteristics, rather than using a uniform voltage for all colors.
2Productivity
If the data driving circuit is optimized for a particular sub-pixel arrangement structure, then performance is improved for that structure, but compatibility with different sub-pixel arrangements is lost
Solution Approach 1:
The patent designs the data driving circuit with separate voltage divider circuits for each color channel that can generate appropriate gamma compensation voltages regardless of the sub-pixel arrangement type. This universal design allows the same circuit to support both conventional sub-pixel arrangements and sub-pixel rendering arrangements by simply changing the control signals to the DACs.
3Manufacturing precision
If independent gamma compensation voltages are generated for each color, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple voltage divider circuits by having them share common power supply voltages and control structures. The voltage divider circuits for different colors are implemented in a coordinated manner, reducing the overall complexity compared to completely independent circuits for each color channel.
Data Source
AI summary
A data driving circuit includes a first voltage divider circuit configured to output a gamma compensation voltage for a first color, a second voltage divider circuit configured to output a gamma compensation voltage for a second color, a third voltage divider circuit configured to output a gamma compensation voltage for a third color, a first digital-to-analog converter (DAC) configured to convert input data for the first color using the gamma compensation voltage for the first color to output a data voltage of a first channel, a second DAC configured to convert input data for the second color using the gamma compensation voltage for the second color to output a data voltage of a second channel, and a third DAC configured to convert input data for the third color using the gamma compensation voltage for the third color to output a data voltage of a third channel.