OLED Driving Voltage Margin Control for Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face image quality degradation due to luminance deviations caused by unique characteristic value deviations in driving transistors, which existing compensation technologies fail to effectively address, leading to compromised image quality.
Innovation Solution
An organic light emitting display device and method that includes a compensation margin control system, utilizing a data driver, gate driver, and timing controller to sense threshold voltage shifts in sub-pixels, differentiate between driven and non-driven sub-pixels, and configure driving voltages to compensate for characteristic value deviations, ensuring a margin for negative bios shift compensation without affecting gray level representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing compensation technology is applied to compensate for unique characteristic value deviation in driving transistors, then some luminance deviation can be corrected, but the image quality cannot be improved and can even be lowered due to insufficient compensation margin control
Solution Approach 1:
The patent applies parameter changes by configuring different driving voltages for source driver integrated circuits based on sub-pixel states. Specifically, it changes the voltage parameters dynamically: applying a first driving voltage to driven sub-pixels and a second driving voltage to non-driven sub-pixels, where the second voltage is higher than the first. This parameter adjustment ensures adequate compensation margins for both states, resolving the contradiction between luminance uniformity and image quality by adapting voltage levels to operational requirements.
Solution Approach 2:
The patent implements dynamics by making the driving voltage configurable and variable rather than fixed. The source driver integrated circuits dynamically adjust voltage levels based on whether sub-pixels are in a driven or non-driven state. This dynamic adaptation allows the system to maintain optimal compensation margins across different operational conditions, preventing image quality degradation while achieving luminance uniformity.
2Device complexity
If a single driving voltage is applied to all sub-pixels, then the device structure is simple, but the compensation for unique characteristic value deviation is insufficient leading to luminance deviation
Solution Approach 1:
The patent applies local quality by configuring different driving voltages for different sub-pixel locations or states. Specifically, driven sub-pixels receive a first driving voltage while non-driven sub-pixels receive a second driving voltage. This localized voltage configuration addresses the unique characteristics of each sub-pixel state, achieving adequate compensation margins and luminance uniformity without requiring overly complex global voltage control systems.
3Device complexity
If compensation is performed without considering negative bios shift, then the compensation process is simple, but the compensation margin is insufficient especially for non-driven sub-pixels
Solution Approach 1:
The patent applies preliminary action by proactively configuring adequate compensation margins in advance for both driven and non-driven sub-pixels. The driving voltages are specifically designed to account for potential negative bios shift effects before they occur. By pre-configuring the second driving voltage for non-driven sub-pixels with a higher margin, the system prevents compensation insufficiency without requiring complex real-time adjustment mechanisms during operation.
Data Source
AI summary
A compensation margin control device, an organic light emitting display device, and a driving method thereof according to the present disclosure provide an effect to improve the image quality by ensuring a margin of a negative bios shift compensation region of a driving transistor of a non-driven sub-pixel without affecting a gray level representation and positive compensation.