Integrated Scan and Emission Driver for OLED Dead Space Reduction
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Solution Overview
Problem
In organic light emitting display devices, the separate disposition of scan stages and emission control stages in the display panel leads to dead space, which can result in display defects such as flicker issues.
Innovation Solution
An integration driver is introduced, comprising multiple stages that generate both scan signals and emission control signals using a combination of switching transistors and capacitors, allowing for the reduction of dead space by integrating the functions of scan and emission control drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan stages and emission control stages are separately disposed in the display panel, then each driver can be independently designed and controlled, but dead space increases leading to display defects
Solution Approach 1:
The patent merges the scan driver and emission control driver into a single integrated driver circuit. The integration driver includes a scan signal generation unit and an emission control signal generation unit that share common components such as clock signals, switching transistors, and capacitors. This consolidation eliminates the dead space between separately disposed drivers while maintaining independent control capabilities through dedicated signal generation paths for scan and emission control functions.
2Ease of operation
If separate scan driver and emission control driver are used, then signal generation functions are distributed, but device complexity increases
Solution Approach 1:
The integration driver implements multi-functionality by enabling a single driver circuit to perform both scan signal generation and emission control signal generation. The driver uses universal components including switching transistors controlled by clock signals to alternate between generating scan signals for row selection and emission control signals for OLED activation. This multi-functional design reduces overall device complexity while preserving the signal generation capabilities of separate drivers.
Data Source
AI summary
An integration driver includes a plurality of stages. Each of the plurality of stages includes a scan signal generator including first to third nodes and a fifth node and an emission control signal generator including a fourth node and sixth node. The scan signal generator is configured to generate a first signal provided to a first node, a second signal provided to a second node, and a third signal provided to a third node using a first clock signal, a second clock signal, and a start signal or a carry signal, and generate a scan signal using the second signal and the third signal. The emission control signal generator is configured to generate a fourth signal provided to a fourth node using the third signal and the second clock signal, and generate an emission control signal using the first signal and the fourth signal.