OLED Luminance Compensation via Dummy Pixel Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED displays experience luminance attenuation over time, leading to incorrect color frame display due to differing attenuation rates of red, green, and blue pixels, which existing technologies fail to effectively compensate for.
Innovation Solution
A luminance compensating system utilizing a dummy OLED in a feedback circuit to simulate real pixel current attenuation, generating feedback currents that adjust compensating voltages to regulate data currents and maintain accurate color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED displays are used without compensation, then the display operates initially with correct color frames, but luminance attenuation occurs over time causing incorrect color display
Solution Approach 1:
The patent implements a feedback mechanism using dummy OLEDs that replicate the aging characteristics of real OLEDs. The feedback circuit continuously monitors the luminance attenuation of dummy OLEDs and adjusts the drive currents of real OLEDs accordingly, creating a closed-loop system that maintains display accuracy over time
Solution Approach 2:
The patent uses dummy OLEDs as copies of real OLEDs to simulate and predict aging behavior. These dummy OLEDs are electrically connected in parallel with real OLEDs and receive the same drive currents, allowing their luminance attenuation to mirror that of real OLEDs, which then feeds back for compensation
2Reliability
If dummy OLEDs are added to each pixel for feedback, then luminance compensation is achieved, but device complexity increases
Solution Approach 1:
The patent merges the feedback function into the existing pixel structure by electrically connecting dummy OLEDs in parallel with real OLEDs within the same pixel. This integration allows the feedback mechanism to operate without adding separate complex circuits for each pixel, reducing overall device complexity while maintaining luminance stability
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 system effectively compensates for luminance attenuation across red, green, and blue pixels, ensuring consistent display performance over time and extending OLED display lifespan.
Implementation Method 1
an organic light emitting diode display including a first digital/analog current converter, a second digital/analog current converter, a feedback unit and a compensating unit
Implementation Method 2
Each of the first feedback circuit and the second feedback circuit includes a feedback current mirror circuit and a dummy OLED
Data Source
AI summary
A method of compensating for luminance of an organic light emitting diode is provided. In an embodiment, an operational current of a dummy organic light emitting diode of a color is utilized to simulate the condition that a real pixel current attenuates with time, and a feedback current is outputted accordingly. A compensating voltage is generated according to the feedback current, and is used to regulates the data current inputted to the real pixel so as to compensate for the luminance of the real pixel of the color.