Organic EL Display Power Control via Dynamic Video Signal Adjustment
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Solution Overview
Problem
Display devices with organic electroluminescent panels face challenges in adjusting luminance effectively, leading to power consumption exceeding maximum allowable levels during image display, especially in high-luminance scenarios like white raster displays.
Innovation Solution
A display device configuration that includes an image analyzer to calculate and adjust power consumption by multiplying the video signal with a coefficient based on the maximum allowable power, and a luminance adjuster to adjust the video signal ratio when power exceeds the threshold, ensuring power consumption remains within limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance is increased to improve display quality, then the brightness is improved, but the power consumption exceeds maximum allowable levels
Solution Approach 1:
The patent applies dynamics by making the video signal adjustable based on power consumption conditions. The luminance adjuster dynamically modifies the video signal in response to power consumption thresholds, allowing the display to adapt between high luminance and power saving modes rather than operating at a fixed state
Solution Approach 2:
The patent changes the parameter of the video signal (specifically the luminance parameter) based on power consumption conditions. When power consumption exceeds the threshold, the video signal is adjusted to reduce luminance, thereby changing the display parameter to match power availability
2Use of energy by moving object
If the video signal is adjusted to reduce power consumption, then the power usage is reduced, but the display quality and luminance are degraded
Solution Approach 1:
The patent implements feedback by using the calculated power consumption value to determine adjustments to the video signal. The power consumption calculation unit continuously monitors power usage, and this information feeds back to the luminance adjuster which modifies the video signal accordingly, creating a closed-loop control system
3Use of energy by moving object
If the luminance adjuster modifies the video signal to meet power constraints, then the power consumption is controlled, but the original display content is altered
Solution Approach 1:
The patent applies partial action by only adjusting the video signal when necessary - specifically when power consumption exceeds the predetermined threshold. When power consumption is within acceptable limits, the video signal remains unmodified, preserving original display quality. The adjustment is partial in that it only affects luminance parameters rather than the entire video signal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for appropriate luminance adjustment and reduced power consumption, preventing excessive power usage during high-luminance displays, thereby maintaining efficient operation within the organic EL panel's maximum power constraints.
Implementation Method 1
organic electroluminescent (OELD) panel that uses organic electroluminescence
Data Source
AI summary
A display device includes an electroluminescent panel including first light-emitting elements to emit red (first color), second light-emitting elements to emit green (second color), and third light-emitting elements to emit blue (third color); an image analyzer that obtains, in displaying of a received video signal, first power serving as a total of power required for displaying red (first color), power required for displaying green (second color), and power required for displaying blue (third color), and that calculates second power by multiplying the first power by a predetermined coefficient according to the video signal, and calculates threshold power by multiplying, by the coefficient, maximum allowable power that is allowed when the electroluminescent panel performs image display; and a luminance adjuster that multiplies the video signal by a ratio between the threshold power and the second power when the second power is equal to or greater than the threshold power.