OLED Pixel Driving Layout for Crosstalk-Resistant Brightness
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Solution Overview
Problem
The crosstalk phenomenon in OLED display panels due to characteristic drift of transistors, leading to inconsistent brightness and uneven luminosity, is a significant challenge as panel sizes increase.
Innovation Solution
The implementation of multiple driving modules and light-emitting modules in each pixel unit, where each driving module receives and provides driving current independently to mitigate the effects of transistor characteristic drift, ensuring balanced brightness through shared current adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the current for driving the light-emitting material is reduced to minimize heating in large-size OLED panels, then the heating is reduced, but the transistor characteristic drift increases leading to inconsistent driving current and crosstalk phenomenon
Solution Approach 1:
The pixel unit is divided into multiple sub-pixel units, each with its own driving transistor. By segmenting the driving function across multiple transistors instead of using a single transistor, the impact of individual transistor drift is reduced, and the overall driving current stability is improved while maintaining lower current levels to minimize heating.
2Device complexity
If a single driving module is used in each pixel unit, then the device complexity is low, but the crosstalk phenomenon occurs due to transistor characteristic drift
Solution Approach 1:
Each pixel unit is divided into multiple sub-pixel units with separate driving modules. This segmentation approach increases the number of driving modules from one to multiple, which reduces the crosstalk phenomenon caused by transistor drift while maintaining reasonable device complexity through systematic design.
Solution Approach 2:
The patent changes the parameter of driving module quantity from single to multiple. By increasing the number of driving modules in each pixel unit, the system achieves better brightness consistency and reduces crosstalk, while the complexity increase is managed through standardized module design.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes multiple pixel units arranged in an array, and the multiple of pixel units each are configured to execute image display according to a received data signal. Each of the plurality of pixel units includes at least two driving modules and at least one light-emitting module, the at least two driving modules are electrically connected to the at least one light-emitting module, respectively, and are configured to simultaneously receive the data signal and respectively provide corresponding driving current to the at least one light-emitting module, to drive the light-emitting module to emit light for image display.