Display Source Driver Segmentation for Power Reduction
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Solution Overview
Problem
As the resolution of display devices increases, the size of the source driver also increases, leading to higher power consumption due to the need to drive multiple data lines with different color outputs in each horizontal period.
Innovation Solution
A source driver design that includes gamma voltage generation circuits, odd and even data driving circuits, and a switch circuit to alternately generate and output red, blue, and green driving voltages through different data lines using demultiplexers, reducing the number of data driving circuits needed and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If each source amplifier drives a plurality of data lines to reduce source driver size, then the area of the source driver is reduced, but the power consumption increases due to outputting data with different colors in each horizontal period
Solution Approach 1:
The data driving circuits are divided into odd-numbered circuits (driving red and blue data lines) and even-numbered circuits (driving green data lines). This segmentation allows each circuit to specialize in specific color channels, reducing the power consumption associated with switching between different color outputs while maintaining the ability to drive multiple data lines.
Solution Approach 2:
Each data driving circuit is designed to handle multiple color channels (red, green, blue) through time-multiplexed operation. The circuits can sequentially output different color data to different data lines within a horizontal period,实现ing multi-functionality without requiring separate dedicated circuits for each color, thus reducing overall driver area while controlling power consumption.
2Measurement precision
If the resolution of display device increases, then the display quality is improved, but the size of source driver increases leading to higher power consumption
Solution Approach 1:
Multiple data driving circuits are merged into a shared infrastructure where odd-numbered and even-numbered circuits cooperate to drive all data lines. By combining their outputs through the switch circuit, the system achieves high-resolution display capability without proportionally increasing the total power consumption, as circuits share common resources and operate in a coordinated manner.
Solution Approach 2:
The data driving circuits operate in periodic cycles, alternating between driving different color channels during different time intervals within each horizontal period. This periodic operation allows the circuits to efficiently handle high-resolution data streams while minimizing power consumption by keeping circuits in active state and using time-multiplexed switching rather than continuous operation of all circuits simultaneously.
Data Source
AI summary
A source driver for a display device includes a gamma voltage generation circuit, first through (2m)-th data driving circuits, and a switch circuit. The gamma voltage generation circuit generates R, G and B gamma voltages. The (2k−1)-th data driving circuits consecutively receive red image data and blue image data, and consecutively generate a R driving voltage and a B driving voltage using the R gamma voltages and B gamma voltages, respectively, during one horizontal period. The (2k)-th data driving circuits consecutively receive first green image data and second green image data, and consecutively generate a G1 driving voltage and a G2 driving voltage, respectively, using the G gamma voltages during the one horizontal period. The switch circuit outputs the R, B, G1, and G2 driving voltages through different data lines from each other based on a first selection signal and a second selection signal.