OLED Panel Driver Dynamic Voltage Control
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Solution Overview
Problem
Organic light emitting display devices face increased power consumption and reduced lifespan when displaying images with high grayscale, as existing peak luminance control algorithms do not effectively manage driving voltage, leading to unnecessary power usage during low peak luminance images.
Innovation Solution
An organic light emitting display device with a panel driver that calculates and varies the driving voltage based on peak luminance and maximum grayscale values from frame video data, optimizing the driving voltage supplied to the driving voltage line to maintain peak luminance while reducing power consumption and extending the lifespan of the organic light emitting diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fixed D.C. voltage level is supplied to the driving voltage line, then the peak luminance can be maintained, but the power consumption increases unnecessarily during low peak luminance images
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed D.C. voltage level to a dynamically variable driving voltage that adapts to the actual image content. The panel driver continuously monitors the video signal characteristics and adjusts the driving voltage in real-time, allowing the system to optimize power consumption while maintaining required luminance levels for different image scenarios.
Solution Approach 2:
The patent implements parameter changes by modifying the driving voltage parameter based on image analysis. The system calculates peak luminance values from the video signal and correspondingly adjusts the driving voltage magnitude, creating a direct relationship between image brightness requirements and power delivery to the OLED pixels.
2Illumination intensity
If a high grayscale image is displayed, then the image quality is improved, but the power consumption increases and the lifespan of the organic light emitting diode is shortened
Solution Approach 1:
The system dynamically adjusts the driving voltage based on the actual grayscale requirements of each frame. By analyzing the peak luminance value and comparing it with maximum grayscale thresholds, the system applies appropriate voltage levels only when high brightness is necessary, thereby reducing cumulative stress on the OLED and extending operational lifespan.
Solution Approach 2:
The patent implements periodic action through frame-by-frame analysis of video content. The system evaluates each frame's peak luminance characteristics and adjusts driving voltage accordingly, creating a rhythmic pattern of high and low voltage application that corresponds to the temporal structure of displayed images, thus managing OLED stress over time.
3Use of energy by moving object
If the driving voltage is varied based on peak luminance and maximum grayscale values, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The panel driver is designed with multi-functionality, serving both as a standard video signal interface and as an image analysis engine. By integrating peak luminance detection, grayscale calculation, and voltage adjustment capabilities within a single controller unit, the patent avoids adding separate dedicated hardware modules, thus managing device complexity while achieving power optimization.
4Use of energy by moving object
If the peak luminance control algorithm is applied, then the power consumption can be reduced, but the driving voltage must be dynamically adjusted which complicates the control system
Solution Approach 1:
The patent implements feedback by continuously monitoring the video signal's peak luminance characteristics and using this information to adjust the driving voltage. The panel driver establishes a feedback loop where output voltage is determined by real-time analysis of input image characteristics, enabling automatic optimization without complex manual control mechanisms.
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
This solution effectively reduces power consumption and extends the lifespan of the organic light emitting diode by dynamically adjusting the driving voltage according to the image's peak luminance and grayscale values, minimizing unnecessary power usage during low peak luminance images.
Implementation Method 1
each pixel includes an organic light emitting diode which emits light by a current
Data Source
AI summary
Discussed is an organic light emitting display device capable of reducing power consumption and increasing lifespan of the device. The device includes a display panel including pixels in respective pixel regions defined by a plurality of gate lines, data lines and driving voltage lines, wherein each pixel includes an organic light emitting diode which emits light by a current, and a pixel circuit having a driving transistor for controlling a current flowing from the driving voltage line to the organic light emitting diode on the basis of data voltage; and a panel driver for converting frame video data into the data voltage, supplying the data voltage to each pixel, calculating peak luminance value and maximum grayscale value by analyzing the frame video data, and varying the driving voltage based on the peak luminance value and maximum grayscale value.