Data Driving Circuit Gamma Tab Voltage Segmentation
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Solution Overview
Problem
Existing data driving circuits for organic light emitting display devices struggle to generate distinct data voltage ranges for each color, leading to limited bit resolution in high grayscale applications due to area constraints in the routing of lines connected to the gamma voltage generating circuit.
Innovation Solution
A data driving circuit that includes multiple data input terminals for pixel data and voltage input terminals for gamma tab voltages specific to each color and common gamma tab voltages, allowing for independent adjustment of data voltages for each color and achieving high bit resolution in high grayscale areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent gamma voltage generation for each color is implemented, then color accuracy and bit resolution are improved, but the routing area required increases beyond the limited available space
Solution Approach 1:
The gamma voltage generation is segmented into two types: color-specific gamma tab voltages (RGMA, GGMA, BGMA) for low grayscale values and common gamma tab voltages (CGMA) for high grayscale values. This segmentation allows independent optimization for different grayscale ranges while reducing the overall routing area requirement by sharing common voltages in the high grayscale range.
Solution Approach 2:
Different gamma voltage characteristics are applied locally to different grayscale ranges: color-specific gamma tab voltages are used for low grayscale values (0-255) to optimize color accuracy, while common gamma tab voltages are used for high grayscale values (256-1023) to reduce routing complexity. This local differentiation achieves high bit resolution where needed without unnecessarily increasing routing area throughout the entire range.
2Measurement precision
If data voltage ranges are differentiated for each color, then color accuracy is improved, but the complexity of the voltage generation circuit increases
Solution Approach 1:
The voltage generation circuit is segmented into two functional parts: color-specific gamma voltage generation for low grayscale and common gamma voltage generation for high grayscale. This segmentation enables color accuracy optimization in the low grayscale range while simplifying the overall circuit by sharing common voltage resources in the high grayscale range.
Solution Approach 2:
The common gamma tab voltages (CGMA) serve multiple colors simultaneously in the high grayscale range, creating a universal voltage source that reduces circuit complexity. The color-specific gamma tab voltages (RGMA, GGMA, BGMA) are used exclusively for their respective colors in the low grayscale range, providing specialized color accuracy where needed.
Data Source
AI summary
The present disclosure relates to a data driving circuit and a display device including the same, and the data driving circuit includes a plurality of data input terminals to which pixel data of an input image is input, and a plurality of voltage input terminals to which gamma tab voltages for each color having different voltage levels, and common gamma tab voltages having different voltage levels are each input. When the input image includes pixel data having different grayscale values for each color, a data voltage of a corresponding color is changed when any one of the gamma tab voltages for each color is changed, and data voltages of all colors are changed when any one of the common gamma tab voltages is changed.