OLED Pixel Compensation Circuit Uniform Brightness
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Solution Overview
Problem
OLED display devices with special shapes, such as circular or oval, face issues with non-uniform brightness due to varying capacitance of data line capacitors, leading to different display data voltages being written into sub-pixel units, resulting in inconsistent light emission across columns.
Innovation Solution
A pixel compensation circuit is introduced, comprising a signal input unit, driving unit, light-emitting control unit, reset units, and storage capacitors, which allows direct output of display data voltage to sub-pixel units without initial storage in data line capacitors, ensuring consistent voltage distribution and avoiding the need for peripheral compensation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If display data voltage is stored in data line capacitors before being written into sub-pixel units, then the voltage can be distributed to multiple sub-pixels, but the varying capacitance of data line capacitors causes voltage division effects leading to non-uniform brightness
Solution Approach 1:
The patent extracts the data line capacitor from the traditional display data writing path. Instead of storing display data voltage in data line capacitors and then distributing it to multiple sub-pixels, the invention directly writes the display data voltage into each sub-pixel unit through separate pathways, eliminating the voltage division effect caused by varying capacitor capacitances and ensuring uniform brightness across all columns
Solution Approach 2:
The patent segments the voltage distribution pathway by providing independent direct writing paths from the signal input unit to each sub-pixel unit. This segmentation eliminates the need for a shared data line capacitor, allowing each sub-pixel to receive the exact display data voltage without being affected by capacitance variations in other columns
2Illumination intensity
If peripheral compensation devices are added to correct brightness non-uniformity, then brightness uniformity can be improved, but device complexity increases
Solution Approach 1:
Instead of adding peripheral compensation devices to correct the brightness non-uniformity problem after it occurs, the patent inverts the approach by redesigning the fundamental voltage distribution architecture. The display data voltage is directly written into each sub-pixel unit without passing through shared data line capacitors, thereby preventing the voltage division effect at its source and eliminating the need for additional compensation circuits
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 ensures uniform brightness across different columns of pixel units by eliminating voltage division effects, thus addressing the issue of non-uniform light emission and satisfying narrow-bezel development requirements for OLED displays.
Implementation Method 1
a first storage capacitor, a first switching transistor and a second switching transistor... an output of the second switching transistor, the second reset unit and one end of the first storage capacitor are respectively connected with an output of the first switching transistor
Implementation Method 2
a signal write control line is connected with a control end of the first switching transistor... the signal write control line controls the first switching transistor to be switched on
Data Source
AI summary
A pixel compensation circuit, a driving method thereof and a display device are provided. The pixel compensation circuit includes: a signal input unit, a driving unit, a light-emitting control unit, a first reset unit, a second reset unit, a first storage capacitor, a first switching transistor and a second switching transistor. When display data are written into the signal input unit, a signal write control line controls the first switching transistor to be switched on. The driving method of the pixel compensation circuit can be applied in the pixel compensation circuit. The pixel compensation circuit can be applied in an OLED display device.