Dynamic Analog Supply Voltage Control for OLED Power Optimization
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Solution Overview
Problem
Display devices, particularly OLEDs, face challenges in reducing power consumption, especially in always-on display modes where constant images are shown, leading to increased power usage due to fixed voltage levels.
Innovation Solution
A display device and driving method that utilize a display panel with multiple power voltages and a DC-DC conversion circuit to adjust the voltage level of the analog supply voltage based on the on-pixel ratio of the image data, dynamically controlling the number of pulses in voltage control signals to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage level of the analog supply voltage is kept fixed to ensure stable display performance, then display quality is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment by modifying the pulse width of control signals based on the on-pixel ratio. The voltage controller dynamically changes the analog supply voltage level according to display content characteristics, transitioning from fixed voltage to adaptive voltage control, thereby resolving the contradiction between stable display performance and power consumption
Solution Approach 2:
The patent changes the voltage parameter of the analog supply voltage based on the on-pixel ratio calculation. By adjusting the voltage level dynamically according to display content (full-screen vs. partial-screen images), the system optimizes power consumption while maintaining adequate display quality, directly addressing the contradiction between fixed voltage reliability and energy efficiency
2Use of energy by moving object
If the analog supply voltage is lowered to reduce power consumption, then energy efficiency improves, but display performance may deteriorate
Solution Approach 1:
The patent dynamically adjusts the voltage parameter based on the on-pixel ratio, ensuring that voltage is lowered only when appropriate (during full-screen display modes) while maintaining higher voltage for content requiring better performance. This conditional parameter adjustment resolves the contradiction by adapting voltage levels to actual display needs
Solution Approach 2:
The system transitions from static voltage control to dynamic voltage control, where the analog supply voltage adapts in real-time based on display content characteristics. This dynamic adjustment ensures power consumption is reduced without compromising display performance when high quality is needed, resolving the contradiction between energy efficiency and performance reliability
3Use of energy by moving object
If dynamic voltage control is implemented to reduce power consumption, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the voltage control function into distinct modules: an on-pixel ratio calculator that analyzes display content, and a voltage controller that adjusts voltage based on calculated ratios. This functional segmentation manages complexity by dividing the control system into specialized components with clear responsibilities, making the dynamic voltage control implementable without excessive system complexity
Solution Approach 2:
The patent introduces an on-pixel ratio calculator as an intermediary component between the display content and the voltage controller. This intermediary processes display content characteristics and provides control signals to the voltage controller, simplifying the overall control logic and managing system complexity while enabling dynamic power optimization
Data Source
AI summary
A display device includes a display panel includes a plurality of pixels driven by a first power voltage and a second power voltage. A display panel driving circuit is configured to receive image data from an external device, output a first voltage control signal for generating an analog supply voltage based on an on-pixel ratio (OPR) of the image data, and output a second voltage control signal for generating the first power voltage and the second power voltage. A DC-DC conversion circuit is configured to generate the analog supply voltage based on the first voltage control signal and generate the first power voltage and the second power voltage based on the second voltage control signal.