Pixel Circuit Piezoresistor Stabilizes Gate Potential for OLED Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED displays suffer from non-uniform light emission, with issues of being not dark in a dark state and not bright in a bright state due to inadequate light uniformity control.
Innovation Solution
A pixel circuit incorporating a piezoresistor is used to stabilize the gate electrode potential of a transistor, ensuring consistent driving current and light emission by acting as a high-resistance or low-resistance switch based on voltage thresholds, thereby addressing non-uniform display problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel circuits are used to control OLED light emission, then the display can operate with basic current control, but non-uniform light emission occurs where OLED elements are not dark in dark state and not bright in bright state
Solution Approach 1:
A piezoresistor is introduced as an intermediary component between the capacitor and the OLED light-emitting element. The piezoresistor acts as a voltage-dependent switch that mediates the current flow to the OLED, enabling precise control of light emission intensity. When voltage exceeds a threshold, the piezoresistor transitions from high resistance to low resistance state, effectively regulating the current and solving the non-uniform light emission problem.
Solution Approach 2:
The piezoresistor's resistance parameter changes dynamically based on the applied voltage. At low voltages (dark state), the piezoresistor maintains high resistance to block current flow. When voltage exceeds the threshold (bright state), the resistance drops to low values, allowing current flow. This parameter change enables the OLED to achieve uniform dark and bright states, resolving the display quality inconsistency.
2Stability of the object's composition
If the gate electrode potential is unstable, then the circuit operation becomes unpredictable, but adding stabilization components increases circuit complexity
Solution Approach 1:
The piezoresistor serves multiple functions simultaneously: it acts as a voltage switch, a current regulator, and a gate electrode potential stabilizer. By integrating these functions into a single component, the circuit achieves stable gate electrode potential without proportionally increasing circuit complexity. The piezoresistor's voltage-dependent resistance naturally stabilizes the gate potential through its switching behavior.
3Ease of manufacture
If current control alone is used for OLED light emission, then the circuit design remains simple, but the display exhibits non-uniformity with elements not being dark enough or bright enough
Solution Approach 1:
The piezoresistor provides self-regulating current control based on the voltage applied to it. When the voltage exceeds the threshold, the piezoresistor automatically transitions to a low-resistance state, allowing current to flow to the OLED. This self-service mechanism eliminates the need for complex external control circuits while achieving uniform light emission, thus maintaining ease of manufacture while improving display quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively stabilizes the gate electrode potential, improving display uniformity and resolving issues of OLED light-emitting elements not being dark enough in dark states or bright enough in bright states, enhancing overall display performance.
Implementation Method 1
A pixel circuit, a display panel and a display device. The present disclosure provides a pixel circuit, a display panel and a display device, aiming to solve the non-uniform display problem and the screen crosstalk problem existing in the related art by providing a piezoresistor
Data Source
AI summary
The present disclosure provides a pixel circuit, a display panel, and a display device. The pixel circuit includes: first and second scan signal input terminals; a data signal input terminal; a first power supply signal input terminal; a light-emitting control signal input terminal; a reference voltage input terminal; first to sixth transistors, a first capacitor, and a piezoresistor having a first electrode electrically connected to a first electrode plate of the first capacitor, and a second electrode electrically connected to a first electrode of the third transistor.