OLED Compensation Unit Brightness Control via Current Variation
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Solution Overview
Problem
Organic light emitting display devices face degradation issues that lead to reduced image brightness over time, affecting display quality, as existing methods fail to effectively compensate for OLED degradation.
Innovation Solution
A compensation unit in the organic light emitting display device measures current variations in OLEDs using a reference voltage, applies a linear function to determine brightness compensation, and adjusts data bits to maintain uniform brightness, employing a compensation method that includes a current measurement unit, storage unit, and calculation unit to generate second data that reflects the brightness compensation amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If OLED is used for display, then fast response speed and low power consumption are achieved, but OLED degrades over time resulting in reduced brightness
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual current flowing through the OLED and comparing it with a reference current value. Based on the measured current variation that indicates degradation, the system automatically calculates a compensation value and adjusts the data signal to compensate for the degradation, thereby maintaining display brightness without increasing power consumption
Solution Approach 2:
The patent changes the data parameter (data signal value) dynamically based on the measured OLED degradation state. By calculating a compensation value from current variation and applying it to adjust the data signal, the system adapts the display parameters to counteract degradation effects while maintaining the original low power consumption characteristics of OLED
2Illumination intensity
If OLED degrades over time, then display brightness decreases, but existing compensation methods are insufficient
Solution Approach 1:
The patent replaces complex physical compensation mechanisms with an electronic data processing approach. Instead of using hardware circuits to physically adjust brightness, the system measures current degradation and substitutes the mechanical compensation approach with digital signal processing - calculating compensation values and adjusting data signals to achieve brightness compensation
Solution Approach 2:
The system performs self-diagnosis and self-compensation by measuring its own OLED degradation through current measurement, calculating the compensation value, and automatically adjusting the data signal. This self-service mechanism eliminates the need for external calibration or manual intervention to maintain display quality
Data Source
AI summary
There are provided an organic light emitting display device capable of enhancing display quality. The organic light emitting display device includes a compensation unit configured to extract current information of an organic light emitting diode (OLED) of a pixel, and configured to determine a brightness compensation amount corresponding to the extracted current information, and a timing controller configured to generate second data by changing bits of externally supplied first data according to the brightness compensation amount, wherein the compensation unit is configured to obtain the brightness compensation amount using a current variation corresponding to a degradation of the OLED, and using a linear function corresponding to the current variation.