OLED Pixel Voltage Compensation for Brightness Uniformity
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Solution Overview
Problem
Conventional OLED displays face issues with abnormal brightness due to different threshold voltages of driving transistors, leading to inconsistent luminance across pixel units.
Innovation Solution
A control method and display panel design that includes a pixel unit with a capacitor, transistor, and luminiferous device, where the voltage of the capacitor terminals is controlled to compensate for threshold voltage differences, ensuring consistent brightness across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional OLED driving methods are used, then the display can be manufactured with simple structures, but the brightness becomes abnormal due to different threshold voltages of driving transistors
Solution Approach 1:
The patent applies preliminary action by adjusting the voltage of capacitor terminals before the luminiferous device is lit. Specifically, during a first period, the voltage of the first terminal is increased and the voltage of the second terminal is reduced, preparing the capacitor to compensate for threshold voltage differences before the actual display operation begins. This preliminary voltage adjustment ensures that subsequent brightness output is uniform across all pixel units.
2Illumination intensity
If voltage compensation methods are implemented, then brightness uniformity is improved, but the control complexity increases
Solution Approach 1:
The patent implements self-service by using the existing capacitor within each pixel unit to automatically compensate for threshold voltage differences. The capacitor utilizes the voltage difference between its two terminals, which is adjusted during a first period, to generate compensating effects without requiring external compensation circuits or complex control systems. This self-service mechanism maintains brightness uniformity while avoiding increased control complexity.
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 method ensures that each pixel unit receives the appropriate voltage, maintaining normal brightness levels despite variations in threshold voltages, resulting in uniform and consistent display performance.
Implementation Method 1
The pixel unit is coupled to a data line and comprises a capacitor, a transistor, and a luminiferous device. The capacitor comprises a first terminal coupled to the data line and a second terminal coupled to the transistor.
Implementation Method 2
The luminiferous device is lit according to the voltage of the capacitor during a third period subsequent to the second period.
Data Source
AI summary
A control method controlling a display panel comprising a pixel unit. The pixel unit is coupled to a data line and comprises a capacitor, a transistor, and a luminiferous device. The capacitor comprises a first terminal coupled to the data line and a second terminal coupled to the transistor. The voltage of the first terminal is increased and the voltage of the second terminal is reduced during a first period. The voltage of the first and the second terminals are controlled during a second period subsequent to the first period. The luminiferous device is lit according to the voltage of the capacitor during a third period subsequent to the second period. The voltage of the data line is maintained during the third period.