OLED Pixel Driving Circuit Simplification via Current Control
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Solution Overview
Problem
Existing OLED display pixel driving circuits are complex and difficult to manufacture due to their electronic device density, which complicates the task of maintaining constant current driving for OLED light-emitting devices, affecting luminance and contrast.
Innovation Solution
A simplified pixel driving circuit comprising a current control circuit, a current switching circuit, and a grounding control circuit, connected in series, which generates and controls a constant current signal to drive OLED light-emitting devices independently, reducing structural complexity and enabling adjustable luminance through a voltage regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pixel driving circuits are used to drive OLED light-emitting devices, then constant current driving can be achieved, but the circuit structure becomes complex and manufacturing becomes difficult
Solution Approach 1:
The patent combines multiple circuit functions into three integrated modules: current control circuit, current switching circuit, and grounding control circuit. This merging reduces the overall number of separate electronic devices while maintaining constant current driving capability, directly addressing the contradiction between manufacturing ease and circuit functionality.
Solution Approach 2:
The current control circuit serves multiple functions: it provides constant current driving, generates activation signals, and works cooperatively with the grounding control circuit. This multi-functionality reduces the need for separate dedicated circuits, simplifying the overall structure while maintaining manufacturing precision.
2Manufacturing precision
If more electronic devices are added to the pixel driving circuit to maintain constant current driving, then driving accuracy is improved, but the number of electronic devices increases making manufacturing more complex
Solution Approach 1:
The patent implements precise constant current driving locally within each of the three circuit modules rather than requiring high precision across many separate components. Each module is designed to perform its specific function with adequate precision, and their cooperative interaction achieves the overall constant current driving accuracy without requiring an excessive number of high-precision electronic devices.
Solution Approach 2:
The current control circuit dynamically adjusts electrical parameters (current magnitude, activation signal timing) to maintain constant current driving. This parameter-based control approach achieves driving accuracy without requiring a fixed complex structure, allowing for easier manufacturing while maintaining performance.
3Ease of manufacture
If a simplified pixel driving circuit is used, then manufacturing is easier and structure is simpler, but control capability over light-emitting devices may be reduced
Solution Approach 1:
The patent introduces dynamic control through the grounding control circuit which can actively adjust the operating state of the light-emitting device. The combination of current control, switching control, and grounding control creates a dynamic system that adapts to different display requirements while maintaining a simplified three-module structure that is easier to manufacture than traditional circuits.
Solution Approach 2:
The grounding control circuit acts as an intermediary between the simplified circuit structure and the light-emitting device, enabling enhanced control capability. This intermediary component allows the simplified three-module circuit to achieve fine-grained control over the light-emitting device without requiring a complex overall structure, thus resolving the contradiction between manufacturing ease and control capability.
Data Source
AI summary
A pixel driving circuit is provided, comprising: a current control circuit configured to provide a constant current signal and an activation signal, a current switching circuit configured to control the transmission of the constant current signal to a light-emitting device under the control of the activation signal, and a grounding control circuit configured to control the current control circuit to provide the constant current signal and the activation signal. An input terminal of the current control circuit is connected to a data line and a power line, respectively. A control terminal of the current switching circuit is connected to an output terminal of the current control circuit, an input terminal of the current switching circuit is connected to the input terminal of the current control circuit, and an output terminal of the current switching circuit s connected to an input terminal of the light-emitting device.