Light Emission Control Driver for OLED Bezel Reduction
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Solution Overview
Problem
The challenge in organic light emitting display devices is to reduce the ripple phenomenon and improve the operating margin of the circuit while simplifying the circuit layout, which is complicated by the need to balance bezel size reduction and circuit stability.
Innovation Solution
A light emission control driver is designed with multiple stages, each comprising a first circuit part to receive start signals and control nodes based on a clock signal, a second circuit part to stabilize signals using transistors and capacitors, and an output part to generate light emission control signals. This configuration allows the first and second light emission control signals to function as start signals for the next stage, reducing the gate-driver area and stabilizing node voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the bezel is reduced, then the area of the display device is decreased, but the stability of the circuit is lowered
Solution Approach 1:
The light emission control driver is divided into multiple stages, with each stage independently controlling a light emission control line. This segmentation allows the circuit to be distributed across the bezel area, reducing the concentration of circuit elements in one location and enabling better thermal and signal management, thereby maintaining circuit stability while reducing overall bezel size.
Solution Approach 2:
The patent utilizes both first and second light emission control signals generated in each stage, allowing the circuit to operate in multiple dimensions of control. By using dual signals (first and second) for each light emission control line, the circuit achieves more robust control and stability without requiring larger element sizes or more complex layouts.
2Reliability
If the stability of the circuit is increased, then the reliability is improved, but the size of the element becomes larger and the layout becomes complicated
Solution Approach 1:
By dividing the driver into multiple stages with each stage handling specific light emission control lines, the patent creates a modular structure that simplifies the overall layout. Each stage is a repeatable unit, making the design process more systematic and reducing layout complexity while maintaining stability.
Solution Approach 2:
Each stage is designed to be universal and multi-functional, capable of generating both first and second light emission control signals that can control corresponding light emission control lines. This universality reduces the need for specialized circuit elements for different functions, simplifying the overall layout while maintaining circuit stability.
3Reliability
If the ripple phenomenon is reduced, then the signal quality is improved, but the circuit design becomes more complex
Solution Approach 1:
The patent segments the signal generation into multiple stages, where each stage independently generates control signals. This segmentation isolates potential ripple sources to specific stages rather than allowing them to propagate through the entire circuit, improving signal quality while keeping each stage's design relatively simple and manageable.
Solution Approach 2:
The patent introduces intermediate control signals (first and second light emission control signals) that act as mediators between the clock signal and the final output. These intermediate signals provide additional control points that help reduce ripple effects while maintaining a systematic and organized circuit design approach.
Data Source
AI summary
Provided herein is a light emission control driver according to an aspect of the present disclosure. The light emission control driver includes a plurality of stages, wherein each of the plurality of stages has a first circuit part configured to receive a first start signal and a second start signal and control a first node and a second node in response to a first clock signal, a third circuit part configured to output a second light emission control signal in response to a first control signal applied to the first node or a second control signal applied to the second node, and an output part configured to output a first light emission control signal in response to the first control signal or the second light emission control signal.