OLED Display Compensation via Data Signal Timing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face issues with luminance degradation due to OLED deterioration, where existing methods complicate the circuit and increase size by adjusting voltage, and fail to accurately compensate for minute deterioration and maintain gamma values.
Innovation Solution
An organic light emitting display device with a sensing unit to determine OLED deterioration, a compensation unit to adjust data signal supply time based on comparison signals, and a switching unit to selectively couple data lines to the sensing or supply time controller, using transistors and comparators to control turn-on time and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage adjustment methods are used to compensate for OLED deterioration, then luminance degradation can be addressed, but circuit complexity increases and device size increases
Solution Approach 1:
The patent changes the parameter being adjusted from voltage to time. Instead of modifying voltage levels to compensate for OLED deterioration, the invention adjusts the supply time duration of data signals. This time-based compensation approach achieves luminance stabilization without requiring complex voltage adjustment circuits, thereby resolving the contradiction between reliability and device complexity.
2Reliability
If voltage adjustment methods are used to compensate for OLED deterioration, then luminance degradation can be addressed, but device size increases
Solution Approach 1:
The patent transitions from voltage-based compensation to time-based compensation. By controlling the duration of data signal supply rather than adjusting voltage levels, the invention eliminates the need for additional voltage adjustment components, thereby maintaining OLED luminance stability without increasing device size.
3Reliability
If existing compensation methods are used, then some deterioration can be addressed, but minute deterioration cannot be accurately compensated and gamma values cannot be maintained
Solution Approach 1:
The patent implements a feedback mechanism where the sensing unit continuously monitors OLED characteristics and provides information to the supply time controller. This closed-loop system allows for real-time detection of minute deterioration and dynamic adjustment of data signal supply time, enabling accurate compensation and maintaining gamma values that were previously unachievable with open-loop voltage adjustment methods.
Solution Approach 2:
The patent replaces voltage-based compensation mechanisms with a time-based control system. By substituting voltage adjustment with precise time control of data signal supply, the invention achieves higher measurement precision for detecting minute OLED deterioration and maintains accurate gamma values through temporal rather than electrical parameter modulation.
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
Effectively compensates for OLED deterioration by adjusting data signal supply time, reducing circuit complexity, maintaining gamma values, and minimizing size increases, while accurately measuring and addressing OLED degradation.
Implementation Method 1
the organic light emitting display device displays an image by using organic light emitting diodes that emit light by recombining holes with electrons
Data Source
AI summary
An organic light emitting display device is configured to compensate for deterioration of organic light emitting diodes (OLEDs) included in the device. The organic light emitting display device includes: a plurality of pixels; a timing controller for generating a comparison signal to determine a deterioration degree of an OLED included in each of the pixels; a sensing unit for sensing a deterioration information of the OLED; a supply time controller coupled between data lines and a data driver; a compensation unit for controlling the supply time controller so that a supply time of a data signal varies to correspond to the deterioration information and the comparison signal; and a switching unit coupled to the data lines, the sensing unit, and the supply time controller. The switching unit is configured to selectively couple the data lines to the sensing unit or the supply time controller.