Stage Circuit for Organic Light Emitting Display
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Solution Overview
Problem
Existing organic light emitting display devices require separate mounting areas for the scan driving unit and light emitting control line driving unit, leading to increased dead space and difficulty in minimizing the thickness and width of portable devices.
Innovation Solution
A stage circuit that generates both scan and light emitting control signals using a control unit controlling nodes for signals from multiple input terminals, with output units comprising transistors and capacitors to supply signals with different polarities, allowing for shared mounting areas and minimizing dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate mounting areas are used for scan driving unit and light emitting control line driving unit, then signal generation and control functions are achieved, but dead space increases and device dimensions cannot be minimized
Solution Approach 1:
The patent combines the scan driving unit and light emitting control line driving unit into a single integrated stage circuit. The control unit generates both scan signals and light emitting control signals using shared transistors and capacitors, eliminating the need for separate mounting areas and reducing dead space in the display device.
Solution Approach 2:
The stage circuit is designed as a universal building block that performs multiple functions: generating scan signals, generating light emitting control signals, and controlling pixel activation. This multi-functional design allows a single circuit to replace what would traditionally require separate dedicated circuits for each function.
2Ease of manufacture
If separate mounting areas are allocated for scan driving unit and light emitting control line driving unit, then distinct signal generation is achieved, but device thickness and width cannot be minimized in portable devices
Solution Approach 1:
By merging the scan driving and light emitting control line driving functions into a single stage circuit, the patent reduces the overall footprint of the display device. The integrated design allows for reduced thickness and width, which is critical for portable devices where space is at a premium.
3Area of stationary object
If a single stage circuit generates both scan and light emitting control signals, then mounting area is reduced, but signal polarity differentiation and timing control become more complex
Solution Approach 1:
The control unit is segmented into multiple transistor-based switching elements that can independently control signal polarity and timing. By dividing the control function into discrete transistor switches and capacitor-based timing elements, the circuit achieves complex signal differentiation while maintaining a compact integrated structure.
Solution Approach 2:
The stage circuit employs dynamic control through transistor switching to differentiate signal polarities and timing in real-time. The control unit uses dynamic voltage switching and timing control mechanisms that adapt signal characteristics based on operational requirements, enabling a single circuit to handle multiple signal types without requiring separate static circuits for each.
Data Source
AI summary
An organic light emitting display device having a stage circuit capable of creating a scan signal and a light emitting control signal. The stage circuit includes a control unit controlling a first node and a second node corresponding to signals of a first input terminal, a third input terminal, and a fourth input terminal, a first output unit supplying a light emitting control signal to a second output terminal corresponding to voltages at the first node and the second node, and a second output unit supplying a scan signal having different polarity than that of the light emitting control signal to a first output terminal corresponding to a signal of a second input terminal and voltages at the first node and the second node.