Transistor Parameter Estimation for Display Brightness Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In systems with transistors having uncertain or varying parameters, existing methods fail to consistently achieve desired brightness across multiple pixels due to parameter differences, leading to inconsistent performance in display devices.
Innovation Solution
A method and system for transistor parameter estimation, which measures current at various control voltages to calculate compensation coefficients, allowing for adjustment of control voltages to match a reference transistor's performance, thereby compensating for parameter variations and ensuring consistent brightness across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing methods are used to drive transistors with uncertain parameters, then the device complexity is reduced, but the brightness consistency across pixels deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring transistor parameters (threshold voltage, mobility, area) before driving the transistor to display a pixel. Compensation coefficients are calculated in advance based on these measured parameters, allowing the system to pre-adjust control voltages to account for transistor variations before actual display operation, thereby ensuring brightness consistency without adding complex real-time control circuits.
2Illumination intensity
If compensation coefficients are calculated and applied to each transistor, then the brightness consistency is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the electrical parameters (control voltages) based on calculated compensation coefficients derived from measured transistor parameters. Instead of changing the physical structure or adding complex compensation circuits, the system adjusts voltage parameters dynamically to compensate for transistor variations, achieving brightness consistency through parameter optimization rather than structural complexity.
3Manufacturing precision
If transistor parameters are measured and compensated, then the manufacturing precision is improved, but the measurement precision requirements increase
Solution Approach 1:
The patent applies feedback by measuring actual transistor parameters (threshold voltage, mobility, area) and using these measurements to calculate compensation coefficients that are then applied to control voltages. This closed-loop feedback mechanism allows the system to automatically adjust for manufacturing variations in transistor parameters, improving manufacturing precision through measurement and compensation rather than requiring extremely tight manufacturing tolerances.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system and method for setting one or more compensation coefficients for a transistor. In some embodiments, a method for setting a first compensation coefficient for a transistor includes: determining a plurality of measured transistor currents, each at a respective one of a plurality of transistor control voltages; setting the first compensation coefficient based on the measured transistor currents and the transistor control voltages; and adjusting a voltage applied to a gate of the transistor based on the first compensation coefficient, the voltage corresponding to a color value.