Display Device Dynamic Voltage Adjustment for Power Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active matrix organic light emitting displays face increased power consumption due to higher driving voltage requirements for higher luminance images, leading to reduced battery life in portable devices.
Innovation Solution
A display device and driving method that reduce power consumption by using an automatic current limit (ACL) unit to process image data, calculating a driving voltage based on peak luminance, and adjusting the voltage difference between voltage sources to optimize driving current, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If driving voltage is increased to display higher luminance images, then image brightness is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable rather than fixed. The voltage difference setting unit dynamically adjusts the driving voltage based on the peak luminance of the displayed image, allowing the system to adapt between low and high luminance modes. This resolves the contradiction by enabling high brightness when needed while maintaining low power consumption during normal operation.
Solution Approach 2:
The patent changes the parameter of driving voltage according to the peak luminance of the image data. By detecting the peak luminance and calculating a corresponding driving voltage, the system optimizes the voltage level for each display condition. This parameter change allows the system to achieve high brightness for high luminance images while reducing voltage and power consumption for lower luminance images.
2Duration of action of moving object
If driving voltage is reduced to lower power consumption, then battery life is extended, but image luminance capability is limited
Solution Approach 1:
The system dynamically adjusts driving voltage based on actual display requirements. When high luminance images are detected, the voltage is increased to maintain brightness capability. When lower luminance images are displayed, the voltage is reduced to extend battery life. This dynamic adjustment allows the system to achieve both extended battery life and maintained luminance capability as needed.
Solution Approach 2:
The driving voltage parameter is changed according to the peak luminance of the displayed image. By calculating and applying an optimized driving voltage based on the actual image content, the system ensures sufficient luminance capability when required while reducing voltage to extend battery life during periods when maximum luminance is not needed.
3Illumination intensity
If fixed high driving voltage is applied continuously, then maximum luminance is maintained, but unnecessary power consumption increases
Solution Approach 1:
The system transitions from a fixed high voltage approach to a dynamic voltage adjustment system. The voltage difference setting unit continuously monitors the peak luminance of the displayed image and adjusts the driving voltage accordingly. This allows the system to maintain maximum luminance when high luminance images are displayed while reducing voltage to eliminate unnecessary power consumption during periods when maximum luminance is not required.
Solution Approach 2:
The driving voltage parameter is dynamically changed based on the peak luminance of the displayed image rather than remaining fixed at a high level. By calculating and applying an optimized voltage level for each display condition, the system maintains maximum luminance capability when needed while reducing voltage to minimize unnecessary power consumption during normal or low-luminance operation.
Data Source
AI summary
A display device includes: a panel including a plurality of pixel circuits, each of the pixel circuits including a light emitting element having one end coupled to a first voltage source for supplying a first voltage and another end coupled to a second voltage source for supplying a second voltage; a controller for reducing image data for one frame and for outputting a control signal and a data signal to display an image corresponding to the reduced image data on the panel; a voltage difference setting unit for detecting a peak value of the reduced image data and for calculating a driving voltage for generating a peak driving current corresponding to the peak value; and a power supply for generating the first and second voltages and for providing the first and second voltages to the panel in accordance with the driving voltage.