OLED Luminance Compensation via Diode Current Measurement
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels face issues with luminance uniformity due to variations in thin film transistors and organic emitting layers, requiring time-consuming and costly luminance adjustments using expensive meters.
Innovation Solution
An OLED display device with a diode current measuring portion to divide the display region into areas, measure current, and generate gain values for luminance compensation, allowing for image data adjustment to achieve uniform luminance without the need for expensive luminance meters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional luminance meter measurement and adjustment is used, then luminance uniformity can be achieved, but manufacturing time is extended and production cost increases
Solution Approach 1:
The patent replaces the mechanical luminance meter measurement system with an electrical current measurement system. By measuring the current through the light emitting diode and calculating luminance based on this electrical parameter, the system eliminates the need for physical luminance meters and manual measurement processes, thereby speeding up production while maintaining luminance uniformity control
Solution Approach 2:
The patent creates an electrical model/copy of the luminance measurement process. Instead of directly measuring optical luminance with a luminance meter, the system measures the electrical current that drives the LED and uses this as a proxy to determine and adjust luminance, achieving the same control objective through an electrical equivalent
2Manufacturing precision
If traditional luminance meter measurement and adjustment is used, then luminance uniformity can be achieved, but manufacturing cost increases
Solution Approach 1:
The patent uses simple, inexpensive electrical measurement components (current measuring portion) instead of expensive luminance meters. The current measurement system is much cheaper to implement and can be integrated directly into the manufacturing line, significantly reducing the cost of luminance compensation while maintaining uniformity quality
3Manufacturing precision
If process improvements are made to raise uniformity of organic material deposition, then manufacturing precision improves, but luminance property still varies over time requiring additional test steps
Solution Approach 1:
The patent implements a feedback mechanism where the current measuring portion continuously monitors the actual current through each pixel's LED, and the timing control portion uses this feedback to calculate and apply real-time compensation. This closed-loop system detects and corrects luminance variations as they occur, eliminating the need for separate post-manufacturing test steps
Data Source
AI summary
An organic light emitting diode display device includes: a display panel including a plurality of pixels in a display region, each pixel including a switching thin film transistor, a driving thin film transistor, and a light emitting diode, the display region divided into a plurality of regions; a diode current measuring portion electrically connected to the light emitting diode of each pixel and measuring a current of each divided region; a timing control portion obtaining a gain value of each divided region based on the measured current of each divided region, and generating compensated image data using the gain value; a gate driver supplying gate voltages to the display panel; and a data driver supplying data voltages corresponding to the compensated image data to the display panel.