OLED Pixel Circuit Gate Driving Line Reduction
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Solution Overview
Problem
Existing OLED display technologies require two gate driving lines for a 3T1C pixel circuit, leading to increased complexity and bezel size due to the need for two output terminals from each gate driving unit, which complicates the design and increases costs.
Innovation Solution
A pixel circuit and driving method that utilizes two rows as a basic unit, connecting the first writing unit and second sensing unit to one driving line and the second writing unit and first sensing unit to another driving line, reducing the number of output terminals required from each gate driving unit to one per row, thereby simplifying the circuit and reducing the bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two gate driving lines are used for a 3T1C pixel circuit, then the pixel circuit can be driven properly, but the circuit complexity and bezel size increase
Solution Approach 1:
The patent merges the control of writing and sensing units across two pixel circuits (first and second pixel circuits) into a single gate driving line. Specifically, the first writing unit and second sensing unit share one gate driving line, while the second writing unit and first sensing unit share another gate driving line. This sharing approach reduces the total number of gate driving lines from four (if each unit had dedicated control) to two, thereby reducing circuit complexity and bezel size while maintaining proper driving capability.
2Ease of operation
If two output terminals are required from each gate driving unit, then each pixel circuit can be independently controlled, but the design complexity and costs increase
Solution Approach 1:
The gate driving units are designed with multi-functionality to serve multiple purposes. Each gate driving unit can control both writing units and sensing units across different pixel circuits through shared gate driving lines. For example, one gate driving unit controls both the first writing unit and second sensing unit, demonstrating universal control capability. This multi-functional design reduces the number of dedicated output terminals needed while maintaining independent control capability.
3Area of stationary object
If the number of gate driving lines is reduced, then the bezel size is reduced, but the circuit design becomes more challenging
Solution Approach 1:
The patent segments the pixel circuits into pairs (first and second pixel circuits) that share gate driving lines. Within each pair, the writing units and sensing units are controlled through shared gate driving lines in a systematic manner. This segmentation approach allows for reduced bezel size while managing design complexity through organized, repeatable patterns that can be applied across the display panel.
Data Source
AI summary
A pixel circuit includes a data line, a sensing line, a first pixel sub-circuit and a second pixel sub-circuit. The first pixel sub-circuit includes a first writing unit, a first sensing unit and a first driving unit. The first driving unit is configured to drive a first light-emitting unit to emit light. The second pixel sub-circuit includes a second writing unit, a second sensing unit and a second driving unit. The second driving unit is configured to drive a second light-emitting unit to emit light. The first writing unit and the second sensing unit are both configured to be connected to a gate driving unit. The second writing unit and the first sensing unit are both configured to be connected to another gate driving unit.