Source Driver Mode Control for Low-Power Dot Inversion Displays
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Solution Overview
Problem
Current driver circuits for liquid crystal displays face challenges in balancing power consumption and display quality, particularly with polarity inversion methods that lead to increased power consumption and potential flicker issues, and require matching data modes across source drivers at different ends of a data line to ensure correct signal reception.
Innovation Solution
A driver circuit with a mode control unit and multiple source drivers, where each source driver has subsets of channels activated by start pulses to receive pixel signals from either data bus, ensuring channels at both ends of a data line receive signals from the same data bus, thereby reducing voltage swing and maintaining display quality through dot inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dot inversion is performed to improve display quality, then display quality is improved, but power consumption increases due to high voltage swings
Solution Approach 1:
The patent implements dynamic polarity control where the source driver alternates between different data modes (first mode and second mode) based on scan periods. This dynamic switching allows the system to achieve dot inversion for display quality while managing voltage swings through controlled polarity alternation rather than continuous high-voltage switching.
Solution Approach 2:
The patent changes the data mode parameter of the source driver between first mode and second mode. In the first mode, the source driver receives video data from a first data path, and in the second mode, it receives video data from a second data path. This parameter change enables the system to achieve dot inversion while controlling power consumption through managed voltage swings.
2Use of energy by moving object
If column inversion or frame inversion is used to save power consumption, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The patent segments the data input paths into multiple separate data paths (first data path and second data path) with different polarities. By dividing the data input into multiple paths rather than using a single path, the system can achieve dot inversion at the pixel level while maintaining lower voltage swings through controlled mode switching, thus improving display quality without proportionally increasing power consumption.
3Manufacturing precision
If source drivers are disposed at different sides of the display panel to accommodate high resolution, then resolution is improved, but data mode matching becomes complex
Solution Approach 1:
The patent implements a universal mode control mechanism that can be applied regardless of the number or position of source drivers. The timing controller's mode control unit can control multiple source drivers (first source driver and second source driver) using the same principle of alternating between first mode and second mode, making the system scalable to high-resolution displays with multiple source drivers without increasing complexity.
Solution Approach 2:
The patent implements a control mechanism where the timing controller monitors and controls the data modes of multiple source drivers. The mode control unit ensures that source drivers at different positions (upper side and lower side of the display panel) operate in coordinated modes, providing feedback control to maintain proper data mode matching across all source drivers.
Data Source
AI summary
A driver circuit includes a mode control unit and a plurality of source drivers to drive a display panel including pixel cells on each scan line. Each source driver has M driving channels, and two subsets of the driving channels are respectively in a first mode and a second mode according to a preset mode sequence. The 1st through Nth driving channels of each of first source drivers and the Mth through (M−N+1)th driving channels of each of second source drivers respectively drive the pixel cells during a first scan period and a second scan period, wherein M≧N. The modes of the Mth through 1st driving channels of the second source drivers are respectively altered to match the modes of the 1st through Mth driving channels of the first source drivers by the mode control unit.