Dynamic Voltage Regulation for Organic EL Display Power Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic electroluminescence (EL) display devices consume excessive power due to voltage drop margins set for peak power consumption scenarios, leading to inefficient power usage, especially in large-sized displays and mobile devices, where the voltage margin for compensating voltage drops is either unnecessary or negligible.
Innovation Solution
A display device with a voltage regulating unit that estimates and adjusts voltage distribution based on video data to minimize voltage drops across power source lines, allowing for reduced power consumption by setting appropriate voltage margins for varying image data, even when peak values are identical.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage drop margin is set to compensate for maximum voltage drop in power source lines, then display luminance is maintained under peak power consumption conditions, but power consumption increases unnecessarily for typical images
Solution Approach 1:
The power source voltage is made dynamically adjustable based on the actual voltage drop conditions. The voltage regulating unit changes the power source voltage according to the luminance data, allowing the system to adapt between peak and typical power consumption scenarios, thereby resolving the contradiction between maintaining reliable display luminance and reducing unnecessary power consumption.
Solution Approach 2:
The power source voltage parameter is changed dynamically based on the calculated voltage drop. Instead of using a fixed high voltage to cover worst-case scenarios, the system adjusts the voltage parameter according to actual needs, reducing power consumption while maintaining display quality.
2Reliability
If power source voltage is increased to compensate for voltage drop, then voltage margin is sufficient for large-sized displays with high current, but power consumption and heat generation increase
Solution Approach 1:
The system calculates the actual voltage drop based on luminance data and uses this information to adjust the power source voltage. This feedback mechanism ensures that voltage margin is sufficient when needed (large displays, high current) while avoiding excessive voltage and power consumption during normal operation.
3Use of energy by moving object
If voltage regulating unit adjusts power source voltage dynamically, then power consumption is reduced for typical images, but device complexity increases
Solution Approach 1:
The voltage regulating unit calculates the required voltage adjustment in advance based on luminance data before actually adjusting the power source voltage. This preliminary calculation approach simplifies the control logic and reduces the complexity of real-time dynamic adjustment.
Data Source
AI summary
A display device according to the present disclosure includes: an organic EL display unit having pixels; a variable voltage source which supplies a voltage to the organic EL display unit; and a voltage drop amount calculating circuit which regulates the voltage output by the variable voltage source, according to video data, in which the organic EL display unit further includes an anode-side power source line network and a cathode-side power source line network connected to the pixels and the variable voltage source, for supplying the voltage from the variable voltage source, and the voltage drop amount calculating circuit estimates, from the video data, a distribution of voltage drop amount in the anode-side power source line network and the cathode-side power source line network for each of the pixels, and regulates the voltage based on the estimated distribution of voltage drop amount for each of the pixels.