OLED Luminance Uniformity via Temperature-Driven Degradation Compensation
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Solution Overview
Problem
Conventional organic light emitting displays face challenges in maintaining uniform luminance due to the degradation of organic light emitting diodes over time, which is exacerbated by temperature variations, making it difficult to display images with desired brightness.
Innovation Solution
Incorporating a temperature sensor and a system that provides correction data to compensate for the degradation of organic light emitting diodes by measuring temperature and degradation levels, using a combination of analog/digital converters, a sensing unit, and a conversion unit to generate correction data for uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If organic light emitting diodes are used to display images, then rapid response time and low power consumption are achieved, but luminance uniformity deteriorates due to degradation over time and temperature variations
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual luminance output of each OLED pixel and using this information to adjust the drive current dynamically. The system continuously monitors luminance characteristics and compensates for degradation by modifying driving parameters based on measured values, thereby maintaining uniform luminance across the display despite OLED aging and temperature variations.
Solution Approach 2:
The patent changes the driving parameters (current, voltage, or pulse width) of individual OLED pixels based on their measured luminance characteristics. By dynamically adjusting these parameters in response to measured degradation levels and temperature conditions, the system compensates for luminance non-uniformity while preserving the rapid response time and low power consumption benefits of OLED technology.
2Reliability
If temperature sensor and correction data system are added to compensate for degradation, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent designs the temperature sensor and correction data system to serve multiple functions: temperature measurement for compensation, degradation monitoring, and adaptive drive parameter adjustment. By making these components multi-functional, the patent reduces the need for separate dedicated systems for each function, thereby limiting the increase in device complexity while achieving improved luminance uniformity through temperature-induced degradation compensation.
3Manufacturing precision
If degradation compensation system is implemented, then image luminance consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates temperature sensors and correction data generation capabilities during the manufacturing process itself. By pre-installing these compensation mechanisms and pre-characterizing each OLED pixel's luminance properties during manufacturing, the system establishes a foundation for continuous luminance consistency without requiring complex post-manufacturing adjustments or calibration procedures.
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 the display of images with consistent luminance by accounting for temperature-induced degradation, ensuring that the organic light emitting diodes maintain uniform brightness levels despite changes in temperature.
Implementation Method 1
the organic light emitting diode generates the light by recombining electrons and holes
Implementation Method 2
a temperature sensor... to measure a temperature of a pixel unit
Data Source
AI summary
An organic light emitting display includes a pixel unit including a plurality of pixels arranged at intersecting points of data lines, scan lines and light emitting control lines; a temperature sensor provided to measure a temperature of the pixel unit; a first analog/digital converter (first ADC) to convert information of the temperature measured in the temperature sensor into a first digital value; a controller to receive the first digital value outputted from the first ADC and outputting a control signal corresponding to the received first digital value; a sensing unit to extract a degradation level of an organic light emitting diode included in each of the pixels; a second analog/digital converter (second ADC) to receive information of the degradation of the organic light emitting diode extracted from the sensing unit and a control signal outputted from the controller and generating a second digital value corresponding to the information of the degradation of the organic light emitting diode that is varied according to the temperature; a conversion unit to convert an input data (Data) into a correction data (Data') so as to display an image having uniform luminance regardless of the changes in the degradation level of the organic light emitting diode according to temperature, by using the second digital value outputted from the second ADC; a data driver to receive the correction data (Data') outputted from the conversion unit and generating data signals to be supplied to the pixels.