OLED Pixel Aging Compensation via Sensing Voltage Feedback
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Solution Overview
Problem
Organic light emitting diode displays face issues with pixel unit aging due to repeated operations, leading to incorrect display problems, which existing technologies fail to detect and compensate effectively.
Innovation Solution
A display apparatus comprising a display unit with pixel units, a source driver, and a compensation unit, where each pixel unit includes transistors, capacitors, and an organic light emitting diode, allowing for the generation of sensing voltage parameters to detect aging and adjust display data for compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic light emitting diode displays are used to achieve smaller size, lower manufacturing cost and less power consumption, then the display performance is improved, but pixel unit aging occurs due to repeated displaying operations leading to incorrect display issues
Solution Approach 1:
The patent implements preliminary detection of pixel unit aging by measuring sensing voltage before display operations, and performs compensation adjustments in advance to prevent incorrect display issues from occurring during normal operation
Solution Approach 2:
The patent establishes a feedback mechanism where the sensing voltage is continuously monitored, compensation data is generated based on the detected aging characteristics, and the display data is adjusted accordingly to maintain reliable display performance over time
2Reliability
If conventional LCDs are used instead of organic light emitting diode displays, then pixel unit aging is avoided, but the display apparatus has larger size, higher manufacturing cost and higher power consumption due to backlight device requirements
Solution Approach 1:
The patent enables the organic light emitting diode display to self-diagnose and self-compensate for aging issues through the sensing voltage measurement and compensation mechanism, eliminating the need for external backlight devices while maintaining display stability
3Reliability
If pixel unit aging detection and compensation mechanisms are implemented, then incorrect display issues are prevented, but the device complexity increases due to additional compensation units and sensing circuits
Solution Approach 1:
The patent merges the compensation unit with the existing pixel unit structure, integrating the sensing voltage measurement and compensation functions into the pixel circuit itself rather than adding separate external compensation systems
Solution Approach 2:
The patent designs the pixel unit to perform multiple functions: normal display operation, sensing voltage measurement for aging detection, and compensation data generation, all within a single integrated circuit structure
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
Enables accurate detection and compensation of pixel unit aging, preventing incorrect displays and extending the lifespan of organic light emitting diode displays by adjusting display data based on sensing voltage parameters.
Implementation Method 1
organic light emitting diode displays have the self-luminance feature
Data Source
AI summary
A display apparatus includes a display unit, a source driver, a gate driver and a compensation unit. The display unit includes at least a pixel unit. Each pixel unit includes a first transistor, a second transistor, a first capacitor, a second capacitor and an organic light emitting diode. When the pixel unit is operated in a display mode, the pixel unit outputs a sensing voltage including a first parameter having characteristics of the second transistor and a second parameter having characteristics of the organic light emitting diode. The source driver receives a compensation data and accordingly adjusts the next display data. The compensation unit is disposed between the second capacitor and the source driver and electrically coupled between the second end of the second capacitor and the source driver. The compensation unit receives the sensing voltage and outputs the compensation data according to the received sensing voltage.