Source Amplifier Bias Control for Variable Display Panel Load
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Solution Overview
Problem
The increasing panel load deviation in display panels due to higher resolution requires either increasing the slew rate of source amplifiers to ensure voltage reach within a setting period or reducing power consumption by decreasing bias current, depending on panel load size, which existing technologies struggle to balance effectively.
Innovation Solution
A display driving circuit that adjusts bias settings of source amplifiers based on panel load size, using an operational amplifier, discharge circuit, switches, and control logic to optimize charging and discharging speeds while managing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the slew rate of source amplifier is increased to ensure voltage reaches target within setting period when panel load is large, then the charging and discharging speed of source line is improved, but power consumption of display driving circuit increases
Solution Approach 1:
The patent implements dynamic adjustment of bias current for source amplifiers based on detected panel load characteristics. During a test period, the system measures the actual charging and discharging speeds of source lines, then adjusts the bias current accordingly to optimize slew rate. This dynamic adaptation allows the system to achieve high voltage transition speeds when needed (large panel load) while reducing power consumption when high speed is not required (small panel load), directly resolving the technical contradiction between speed and energy consumption.
Solution Approach 2:
The system changes the bias current parameter of source amplifiers based on measured panel load characteristics. By detecting the time required for source line voltage to reach target voltage during test periods, the control logic adjusts the bias current to achieve optimal slew rate. This parameter adjustment enables the system to match the amplifier performance to the actual panel load, avoiding unnecessary power consumption while ensuring adequate voltage transition speed.
2Use of energy by moving object
If the bias current of source amplifier is reduced to decrease power consumption when panel load is small, then power consumption is optimized, but charging and discharging speed of source line decreases
Solution Approach 1:
The system dynamically adjusts bias current based on real-time detection of panel load characteristics. During test periods, the system measures whether source lines can be charged and discharged within the required time period. When the panel load is small and the source lines are already being charged/discharged quickly enough, the bias current is reduced to optimize power consumption. This dynamic control ensures adequate performance while minimizing energy waste.
Solution Approach 2:
The bias current parameter is adjusted based on measured panel load characteristics. When detection shows that the source line voltage reaches target voltage within the setting period, the system reduces the bias current to decrease power consumption. This parameter change strategy allows the system to operate efficiently under light load conditions while maintaining adequate charging and discharging speeds.
3Reliability
If the slew rate of source amplifier is increased to accommodate large panel load, then voltage reaches target voltage within setting period, but power consumption increases
Solution Approach 1:
The system implements dynamic bias current adjustment to ensure reliable voltage transition within the setting period only when necessary. During test periods, the system detects whether source lines are being charged and discharged within the required time. When the panel load is large and voltage reach reliability is compromised, the bias current is increased to improve slew rate. This dynamic approach ensures reliability is maintained only when actually needed, avoiding unnecessary power consumption during normal operation.
Solution Approach 2:
The bias current parameter is changed based on detected panel load characteristics to ensure voltage reach reliability. When measurement shows that source line voltage does not reach target voltage within the setting period, the system increases bias current to improve slew rate and ensure reliable operation. This parameter adjustment ensures that power consumption is increased only when reliability requirements are not met, optimizing the trade-off between performance and energy consumption.
Data Source
AI summary
A display driving circuit includes an operational amplifier configured to, in a first phase of a test period, charge a source line of a display panel based on a first voltage received through a first input terminal, and in a second phase of the test period, output a comparison result signal by comparing a second voltage received through the first input terminal with a source line voltage received through a second input terminal; a discharge circuit configured to discharge the source line in the second phase; switches configured to, in the first phase, connect an output terminal of the operational amplifier to the source line, and in the second phase, connect the discharge circuit to the source line and the second input terminal of the operational amplifier; and a control logic configured to control a bias current of the operational amplifier based on the comparison result signal.