Display Pixel Driving Circuit for Vth and Mobility Compensation
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Solution Overview
Problem
Existing display devices face challenges in compensating for threshold voltage and mobility of transistors, leading to increased area requirements for pixel driving circuits and higher power consumption.
Innovation Solution
A display device with a pixel driving circuit comprising a driving transistor, first and second transistors for reference voltage application, a third transistor for source electrode voltage application, and a storage capacitor, which internally compensates for threshold voltage and mobility, minimizing the circuit area and reducing power consumption by separate data and reference voltage lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold voltage and mobility compensation is implemented using conventional methods, then image quality is improved, but pixel driving circuit area increases
Solution Approach 1:
The patent combines threshold voltage compensation and mobility compensation functions into a single integrated pixel driving circuit architecture. The first transistor applies reference voltage to the gate electrode while the second transistor applies data voltage, and the storage capacitor simultaneously handles both compensation types, merging multiple compensation functions into one compact circuit unit.
Solution Approach 2:
The pixel driving circuit is designed with multi-functional transistors and capacitors that perform multiple roles. The storage capacitor serves both threshold voltage compensation and mobility compensation functions. The first and second transistors work together to apply different voltages (reference and data) to the same gate electrode, enabling universal compensation for both parameters without requiring separate dedicated circuits.
2Reliability
If conventional pixel driving circuit configuration is used, then circuit functionality is maintained, but power consumption increases
Solution Approach 1:
The patent extracts and eliminates redundant circuit elements from conventional pixel driving circuits. By using only four transistors and one storage capacitor, the design removes unnecessary components that would otherwise consume power, while still maintaining full compensation functionality through the optimized arrangement of the remaining elements.
Solution Approach 2:
The circuit design discards conventional complex configurations in favor of a simplified architecture that recovers essential compensation functions. The storage capacitor recovers and maintains both threshold voltage and mobility compensation capabilities, while the four transistors recover the voltage application functions, achieving full functionality with reduced power consumption.
3Area of stationary object
If number of transistors and storage capacitors is reduced, then pixel driving circuit area is minimized, but compensation capability may be compromised
Solution Approach 1:
The patent changes the operational parameters and voltage application methods to achieve full compensation capability with fewer components. By carefully controlling the timing and voltage levels applied to the gate electrode through the first and second transistors, and by utilizing the storage capacitor's voltage holding capability, the circuit achieves both threshold voltage and mobility compensation without needing additional transistors or capacitors.
Data Source
AI summary
A display device according to an exemplary embodiment of the present disclosure includes a light emitting diode and a pixel driving circuit which drives the light emitting diode, the pixel driving circuit includes a driving transistor which applies a driving current to the light emitting diode, a first transistor which applies a first reference voltage to a gate electrode of the driving transistor, a second transistor which applies a data voltage to the gate electrode of the driving transistor, a third transistor which applies a second reference voltage to a source electrode of the driving transistor, and a storage capacitor connected to the gate electrode and the source electrode of the driving transistor. According to the present disclosure, the threshold voltage Vth and the mobility of the driving transistors are internally compensated to improve an image quality.