Integrated Scan Driver for OLED Peripheral Area Size Reduction
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Solution Overview
Problem
In organic light-emitting display (OLED) devices, the size and cost of the display are increased due to the large size of drivers mounted in the peripheral area of the display panel, which includes data drivers, gate drivers, and emission drivers.
Innovation Solution
A scan driver is designed with multiple circuit stages that generate and output gate signals, emission control signals, and compensation control signals, with transistors configured to apply and synchronize these signals based on clock signals, allowing for the integration of gate, emission, and compensation drivers into the scan driver, reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate data driver, gate driver, and emission driver are mounted in the peripheral area of the display panel, then each driver can be independently designed and controlled, but the overall size and cost of the display increases
Solution Approach 1:
The patent combines the gate driver and emission driver functions into a single scan driver integrated circuit. The scan driver includes a gate signal generation unit and an emission control signal generation unit that share common circuit resources such as clock signal inputs, control logic, and output buffer structures. This merging reduces the number of separate driver chips needed and minimizes the peripheral area occupied by driver circuits while maintaining independent controllability of gate and emission functions
Solution Approach 2:
The scan driver is designed as a multi-functional integrated circuit that can simultaneously generate gate signals, emission control signals, and compensation control signals. The driver includes multiple signal generators (first signal generator for gate signals, second signal generator for emission control signals, third signal generator for compensation control signals) that operate within a single device, allowing one component to perform multiple driver functions that previously required separate dedicated drivers
2Ease of manufacture
If multiple separate drivers are used for gate, emission, and compensation control, then signal generation and control functions are well-defined, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple driver functions into a single scan driver integrated circuit, reducing the total number of separate driver components from three (gate driver, emission driver, compensation driver) to one integrated unit. This consolidation directly reduces component count, assembly steps, and manufacturing cost while maintaining the distinct signal generation capabilities needed for gate control, emission control, and compensation functions
3Area of stationary object
If gate driver, emission driver, and compensation driver are integrated into a single scan driver, then the size and cost are reduced, but the signal generation and output requirements become more complex
Solution Approach 1:
The integrated scan driver is segmented into distinct functional units: a gate signal generation unit with first and second signal generators, an emission control signal generation unit with third and fourth signal generators, and a compensation control signal generation unit. Each unit has dedicated circuitry for its specific function, allowing complex signal generation tasks to be divided into manageable segments that operate independently but are integrated within the same physical device
Solution Approach 2:
The patent uses clock signal circuits and control logic as intermediary elements that coordinate the operation of multiple signal generators within the integrated scan driver. These intermediary components manage the timing and synchronization of gate signals, emission control signals, and compensation control signals, enabling the complex integrated system to operate harmoniously without requiring excessive interconnections between functional units
Data Source
AI summary
A scan driver is integrated to include multiple drivers in a peripheral area of a display. The drivers output gate, emission, and/or other signals for driving pixel circuits in the display based on one or more clock signals.