Dynamic Bias Current Modulation in Display Output Amplifiers
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Solution Overview
Problem
There is a growing need for display technologies that reduce power consumption while maintaining or improving display quality, particularly to meet evolving energy efficiency standards such as those set by Energy Star, as existing technologies struggle to efficiently manage display panel power usage.
Innovation Solution
The implementation of an output amplifier in a display device with dynamically changing bias currents during different periods of a data signal pulse, where the current value of the first bias current is greater than or equal to the second and third bias currents, effectively shortening the time required for pulse edge skipping and enhancing charging ability, thereby improving display quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a constant bias current is used in the output amplifier, then the circuit design is simple, but the power consumption is high and display quality is insufficient
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static constant bias current to a dynamic time-varying bias current. The output amplifier's bias current is modulated according to the data signal period, with different current values applied during start period, sustain period, and end period. This dynamic adjustment allows the system to optimize both power consumption and display quality by matching the bias current to the actual operational requirements at different time points.
Solution Approach 2:
The patent implements periodic action by synchronizing the bias current modulation with the periodic nature of the data signal. The bias current follows the same periodic pattern as the data signal, with high current during critical periods (start/end) and lower current during the sustain period. This periodic modulation ensures that power is consumed primarily during periods when it is most needed for maintaining display quality.
2Reliability
If a time-varying bias current is used in the output amplifier, then power consumption is reduced and display quality is improved, but the circuit complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the bias current parameter of the output amplifier. Instead of keeping the bias current constant, the system changes the current parameter dynamically according to the data signal period. This is achieved through current modulation circuits that generate different bias current values for different periods (start, sustain, end), thereby improving display quality and reducing power consumption without requiring a complete redesign of the amplifier core.
3Use of energy by stationary object
If high bias current is maintained throughout the data signal period, then display quality is maintained, but power consumption increases
Solution Approach 1:
The patent applies segmentation by dividing the data signal period into three distinct segments: start period, sustain period, and end period. Each segment is assigned a different bias current level based on its specific requirements. The start and end periods use higher bias currents to ensure proper signal transitions and minimize pulse edge skipping, while the sustain period uses lower current to reduce power consumption. This segmentation allows optimized power management without sacrificing critical signal integrity.
Data Source
AI summary
The present application discloses a display device and electronic device. The display device is configured by sequentially configuring the corresponding first bias current, second bias current, and third bias in a start period, a sustain period, and an end period. The current value of the first bias current is greater than the current value of the second bias current, and/or the current value of the third bias current is greater than the current value of the second bias current, which improves the display quality and reduces display power consumption.