Segmented Anode Voltage Driving Circuit for OLED Lifespan
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Solution Overview
Problem
Existing display panels with OLED or QLED technology face challenges in maximizing the lifespan of sub-pixels of different colors, as the driving circuits connected to these sub-pixels are the same, leading to unequal luminance attenuation speeds and reduced service life.
Innovation Solution
The display panel incorporates an anode voltage driving circuit with multiple sub-circuits arranged along a row direction, connected to sub-pixels of different colors, allowing for distinct anode voltage control signals to be provided, thereby optimizing the lifespan of sub-pixels of different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same driving circuit is used for sub-pixels of different colors, then the device complexity is reduced, but the lifespan of sub-pixels of different colors becomes unequal due to different luminance attenuation speeds
Solution Approach 1:
The anode voltage driving circuit is segmented into multiple independent sub-circuits, with each sub-circuit dedicated to driving sub-pixels of a specific color. This segmentation allows each color channel to have its own optimized driving parameters, thereby extending the lifespan of each sub-pixel type while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
Different anode voltage driving sub-circuits are configured with different driving parameters tailored to the specific characteristics of each color channel. This local quality approach ensures that each color (red, green, blue) receives optimized driving conditions according to its luminance attenuation characteristics, thereby maximizing the overall display panel lifespan.
2Duration of action of stationary object
If different anode voltage driving sub-circuits are used for sub-pixels of different colors, then the lifespan of sub-pixels is maximized, but the device complexity increases
Solution Approach 1:
The anode voltage driving circuit is divided into multiple independent sub-circuits, each responsible for a specific color channel. This segmentation enables differentiated driving strategies for red, green, and blue sub-pixels, extending their lifespan while maintaining modular complexity that is easier to manage and implement.
Solution Approach 2:
The multiple anode voltage driving sub-circuits share a common circuit architecture and control mechanism, allowing them to perform the same basic function (driving anode voltage) with different parameters. This multi-functionality approach reduces the actual complexity increase by reusing proven circuit designs across different color channels.
3Productivity
If continuous driving current is applied to light emitting elements, then the productivity is improved, but the lifespan of the light emitting elements is reduced
Solution Approach 1:
The anode voltage driving sub-circuits implement periodic driving with controlled intervals, allowing light emitting elements to rest between activation periods. This periodic action reduces cumulative stress and degradation on the organic or quantum-dot materials, thereby extending their operational lifespan while maintaining acceptable display refresh rates through optimized timing sequences.
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 configuration maximizes the lifespan of sub-pixels by reducing the difference in luminance attenuation speeds, thereby prolonging the service life of the display panel.
Implementation Method 1
a light emitting element; the pixel circuit is configured to apply a driving current to the light emitting element, and the light emitting element is configured to emit light in response to the driving current
Data Source
AI summary
A display panel includes a display area and a non-display area, wherein the display area includes pixel units arranged in array, at least one of the pixel units includes a sub-pixel of a first color, a sub-pixel of a second color and a sub-pixel of a third color, the first color, the second color and the third color are different colors, at least one sub-pixel includes a pixel circuit and a light emitting element, and the pixel circuit is connected to an anode of the light emitting element; the non-display area includes an anode voltage driving circuit connected to a sub-pixel and configured to provide an anode voltage control signal to a pixel circuit of the connected sub-pixel to provide a voltage signal to the anode of the light emitting element.