Display Driver Source Amplifier Switching for Leakage and Power Control
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Solution Overview
Problem
Display drivers, particularly in OLED, micro-LED, and LCD devices, face significant power consumption due to the increased use of source amplifiers, which are needed to suppress charge leakage from storage capacitors during blanking periods.
Innovation Solution
Implement a display driver architecture with a first and second source amplifier, where the first amplifier provides data voltages during display update periods and a predetermined voltage during non-display update periods, while the second amplifier is deactivated, and a switch connects the first amplifier's output to the second amplifier's output to provide the predetermined voltage during non-display update periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all source amplifiers are activated during non-display update periods to suppress charge leakage, then charge leakage suppression is improved, but power consumption increases
Solution Approach 1:
The patent divides the source amplifiers into multiple groups (first source amplifiers and second source amplifiers) and activates only a subset during non-display update periods. Specifically, first source amplifiers are activated to drive source lines at a predetermined voltage during blanking periods, while second source amplifiers remain deactivated. This segmentation allows charge leakage suppression to be maintained for critical lines while reducing overall power consumption by not activating all amplifiers simultaneously.
Solution Approach 2:
The patent applies different operational modes to different source amplifiers based on their specific functions. First source amplifiers are activated during non-display update periods to maintain predetermined voltage on source lines connected to pixels experiencing charge leakage, while second source amplifiers are deactivated as they serve different purposes during display update periods. This local differentiation optimizes the balance between leakage suppression and power consumption.
2Use of energy by moving object
If source amplifiers are deactivated during non-display update periods to reduce power consumption, then power consumption is reduced, but charge leakage from storage capacitors increases
Solution Approach 1:
The patent segments source amplifiers into functional groups and activates only the necessary first source amplifiers during non-display update periods. This selective activation maintains predetermined voltage on source lines to suppress charge leakage from storage capacitors in pixels that experience leakage during blanking periods, while leaving second source amplifiers deactivated to minimize power consumption.
Solution Approach 2:
The patent applies partial action by activating only a subset of source amplifiers (first source amplifiers) during non-display update periods rather than all source amplifiers. This partial activation is sufficient to suppress charge leakage in critical pixels while avoiding the excessive power consumption that would result from activating all amplifiers simultaneously.
3Reliability
If multiple source amplifiers are used to drive source lines at predetermined voltage during blanking periods, then charge leakage suppression is improved, but device complexity increases
Solution Approach 1:
The patent segments source amplifiers into first source amplifiers and second source amplifiers with distinct functional roles. First source amplifiers are configured to drive source lines at predetermined voltage during blanking periods, while second source amplifiers are configured for display update periods. This segmentation, combined with selective activation, manages the complexity by organizing amplifiers into clear functional groups rather than using a single uniform amplifier configuration.
Solution Approach 2:
The patent introduces dynamic control through switches that selectively connect first source amplifiers to source outputs during non-display update periods. This dynamic switching mechanism allows the system to adapt the operational state of source amplifiers based on the current period (blanking vs. display update), managing complexity through controlled flexibility rather than fixed complex architecture.
Data Source
AI summary
A display driver includes first and second source outputs coupled to a display panel, a second source output, a first source amplifier, a second source amplifier, and a first switch. The first source amplifier is configured to provide a first data voltage to the first source output based on first pixel data during a display update period and provide a predetermined voltage to the first source output during a non-display update period. The second source amplifier is configured to provide a second data voltage to the second source output based on second pixel data during the display update period. The first switch is configured to electrically connect an output of the first source amplifier to the second source output to provide the predetermined voltage to the second source output during the non-display update period. The second source amplifier is configured to be deactivated during the non-display update period.