OLED Display Driving Circuit With Reverse Bias for AC Efficiency
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Solution Overview
Problem
The DC driving mode of OLEDs leads to reduced luminous efficiency over time due to capacitance effects and the need for large capacitors and complex compensation circuits, which occupy space and increase power consumption, reducing the panel aperture ratio.
Innovation Solution
A display driving circuit with a storage, compensation, data writing, light-emitting control, and reverse bias subcircuits, utilizing AC driving to equalize or reverse the potentials of the cathode and anode, eliminating the built-in electric field and compensating for threshold voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AC driving is adopted to improve luminous efficiency, then luminous efficiency is improved, but large capacitor and complex compensation circuit are required which occupy space and increase power consumption
Solution Approach 1:
The patent extracts and eliminates the complex compensation circuit and large capacitor from the AC driving system by switching to DC driving mode, where the OLED is driven with a constant voltage or current that does not require capacitance compensation, thereby simplifying the overall circuit structure while maintaining driving effectiveness
Solution Approach 2:
The patent adopts a simpler, more straightforward driving circuit design that replaces the expensive and complex AC compensation components with basic DC driving components, accepting that the DC approach may have different operational characteristics but achieving the goal of reducing space and complexity
2Stability of the object's composition
If large capacitor is coupled in the anode to reduce anode voltage change, then voltage stability is improved, but display area space is occupied and aperture ratio is reduced
Solution Approach 1:
The patent removes the large capacitor from the anode structure by transitioning to DC driving mode, where voltage stability is achieved through the inherent characteristics of DC power supply and simple circuit design rather than through large capacitive elements, thereby freeing up display area
Solution Approach 2:
The patent changes the driving mode parameter from AC to DC, which fundamentally alters the voltage characteristics and eliminates the need for large capacitors to stabilize voltage, as DC inherently provides stable voltage without requiring additional capacitive compensation
3Reliability
If complex compensation circuit is configured to compensate threshold voltage, then threshold voltage compensation is improved, but power consumption is increased
Solution Approach 1:
The patent extracts and removes the complex compensation circuit from the system by adopting DC driving, where threshold voltage compensation is achieved through simpler means or inherent DC characteristics, thereby eliminating the power consumption associated with complex active compensation circuits
Solution Approach 2:
The patent replaces the power-consuming complex compensation circuit with a simpler, lower-power alternative that achieves adequate threshold voltage compensation through basic DC circuit principles rather than through elaborate active compensation mechanisms
Data Source
AI summary
A display driving circuit includes a first transistor, a storage subcircuit, a compensation subcircuit, a data writing subcircuit, a light-emitting control subcircuit and a reverse bias subcircuit. The storage subcircuit is connected to a control terminal of the first transistor through a first node and to the first transistor through a second node. The compensation subcircuit is connected to a first light-emitting control line, the first transistor and a power supply high-voltage terminal. The data writing subcircuit is connected to a data line, a scan line and the first node. The light-emitting control subcircuit is connected to a second light-emitting control line, a second node and an anode of the display light-emitting subcircuit, a cathode of the display light-emitting subcircuit is connected to the scan line. The reverse bias subcircuit is connected to the scan line, a third node and the power supply high-voltage terminal.