Conversion Circuit Adjusting Equivalent Resistance for OLED Brightness Uniformity
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Solution Overview
Problem
Existing display technologies face challenges in achieving uniform brightness due to variations in drive currents generated by drive TFTs, which are affected by inaccuracies in converting current signals to voltage signals during compensation processes.
Innovation Solution
A conversion circuit with a conversion unit and input unit that adjusts equivalent resistance to accurately convert drive currents into voltage signals, ensuring accurate reflection of current values and minimizing conversion inaccuracies, allowing for uniform display brightness by compensating data voltages across different drive TFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current signal to voltage signal conversion is performed using conventional methods, then compensation can be implemented, but conversion accuracy is lost affecting compensation effect
Solution Approach 1:
The patent introduces a conversion circuit as an intermediary component between the current signal (drive current) and voltage signal processing stages. This conversion circuit includes a conversion unit with adjustable equivalent resistance that accurately converts drive current to voltage without significant accuracy loss, thereby maintaining reliable compensation effect. The conversion circuit acts as a mediator that preserves signal fidelity during the current-to-voltage transformation process.
2Illumination intensity
If drive TFTs are used to generate drive current, then OLEDs can be driven, but brightness uniformity is poor due to TFT characteristic variations
Solution Approach 1:
The patent applies parameter changes by adjusting the equivalent resistance of the conversion unit based on the specific drive current characteristics. By dynamically changing the resistance parameter, the system compensates for TFT characteristic variations, ensuring that each pixel receives the appropriate voltage signal to achieve uniform brightness despite manufacturing tolerances in TFT parameters.
Solution Approach 2:
The patent implements a feedback mechanism where the conversion circuit continuously monitors the drive current and adjusts its equivalent resistance accordingly. This feedback loop ensures that variations in TFT characteristics are compensated in real-time, maintaining consistent brightness across all OLEDs by adjusting the current-to-voltage conversion based on actual drive conditions.
3Measurement precision
If equivalent resistance of conversion unit is adjusted, then conversion accuracy is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic adjustment of the equivalent resistance in the conversion unit, allowing the resistance value to change based on operating conditions. This dynamic approach enables high conversion accuracy across different drive currents without requiring multiple fixed resistance circuits, thereby managing device complexity through a single adjustable component rather than multiple static components.
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 enables precise conversion of drive currents into voltage signals, reducing inaccuracies and ensuring uniform brightness across OLEDs by adjusting equivalent resistance, thereby compensating for variations in drive TFTs and resistor differences.
Implementation Method 1
the conversion unit is configured to convert the current signal supplied by the input unit into a voltage signal and output the voltage signal from the output terminal; and an equivalent resistance of the conversion unit is configured such that a preset voltage corresponding to a standard current is output from the output terminal when the standard current is input from the input terminal
Data Source
AI summary
The present disclosure provides conversion circuit and operation method thereof, compensation device, and display apparatus. The conversion circuit includes a conversion unit connected between an output terminal and a first voltage terminal, and an input unit connected with an input terminal and the conversion unit respectively; the input unit is configured to receive current signal from the input terminal and supply the current signal to the conversion unit, and the conversion unit is configured to convert the current signal supplied by the input unit into voltage signal and output the voltage signal from the output terminal; and an equivalent resistance of the conversion unit is configured such that preset voltage corresponding to standard current is output from the output terminal when the standard current is input from the input terminal. With the technical solutions of the present disclosure, drive current for pixel can be accurately converted into voltage signal.