Cathode Potential Control for Organic EL Display Power Optimization
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Solution Overview
Problem
Current techniques for controlling the power consumption of organic EL display panels fail to optimize power use based on temperature-dependent characteristics of organic EL elements, often leading to increased power consumption or reduced image quality.
Innovation Solution
A control device that adjusts the common cathode potential of self-luminous display panels using a cathode potential determination section and application section, canceling temperature-dependent voltage characteristics between anode and cathode electrodes, ensuring the drive transistor operates in the saturation region and minimizing power consumption without altering peak brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the peak brightness level is reduced to suppress power consumption, then power consumption is reduced, but image quality deteriorates
Solution Approach 1:
The invention changes the cathode potential parameter dynamically based on temperature conditions. By adjusting the cathode potential to compensate for temperature-dependent voltage characteristics, the system maintains optimal brightness while reducing power consumption through optimized voltage application across different temperature ranges.
2Use of energy by stationary object
If the cathode potential is adjusted to compensate for temperature effects, then power consumption is optimized, but device complexity increases
Solution Approach 1:
The invention implements self-service by having the display device automatically detect its own temperature and adjust the cathode potential accordingly. The temperature detection and potential adjustment are performed internally by the device itself, eliminating the need for external control systems and reducing overall system complexity.
Solution Approach 2:
The invention employs feedback mechanisms where temperature information from the display device is fed back to the control circuit, which then adjusts the cathode potential accordingly. This closed-loop feedback system optimizes power consumption while maintaining simple device architecture through automatic adaptation.
3Power
If the voltage between source and cathode is reduced to change transistor characteristics, then peak brightness level changes, but temperature-dependent characteristics are not addressed
Solution Approach 1:
The invention specifically changes the cathode potential parameter in response to temperature variations. By dynamically adjusting the cathode potential based on temperature conditions, the system compensates for temperature-dependent voltage characteristics while maintaining optimal transistor operation and display performance.
Data Source
AI summary
Disclosed herein is a cathode potential control device for controlling a common cathode potential applied to a self-luminous display panel adapted to drive and control the light emission status of each of the pixels by active matrix driving, the cathode potential control device including: a cathode potential determination section adapted to read a cathode potential level from a table memory according to a current panel temperature, the cathode potential level being associated with a panel temperature so as to cancel the temperature dependent characteristic of a voltage which develops between anode and cathode electrodes of a self-luminous element during light emission, the level causing a drive transistor of the self-luminous element to operate in the saturation region; and a cathode potential application section adapted to develop a cathode potential associated with the determined cathode potential level and supply the potential to a common cathode electrode of the self-luminous display panel.