OLED Display Luminance Uniformity via Transistor Parameter Sensing
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Solution Overview
Problem
Conventional organic light emitting displays face issues in maintaining uniform luminance due to degradation of organic light emitting diodes and variations in threshold voltage and mobility of drive transistors, leading to inconsistent image quality over time.
Innovation Solution
An organic light emitting display system that includes a sensing unit to detect degradation information of organic light emitting diodes and threshold voltage/mobility information of drive transistors, a switch unit to connect the sensing unit with data lines, and a control block to store and adjust data signals to compensate for these variations, ensuring uniform luminance across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional organic light emitting displays are used without compensation mechanisms, then the device structure remains simple, but the luminance uniformity deteriorates due to diode degradation and transistor variations
Solution Approach 1:
The patent applies preliminary action by measuring and storing degradation information and transistor parameters (threshold voltage, mobility) before they significantly affect display quality. The sensing unit continuously monitors OLED degradation and transistor characteristics, and the timing controller pre-compensates data signals based on stored compensation values, preventing luminance non-uniformity before it occurs.
Solution Approach 2:
The patent implements feedback through a sensing unit that continuously monitors OLED degradation information and transistor parameters. The measured degradation values and transistor characteristics are fed back to the timing controller, which adjusts data signals accordingly. This closed-loop feedback mechanism maintains luminance uniformity by dynamically compensating for component variations and aging effects.
2Reliability
If degradation compensation mechanisms are implemented, then luminance uniformity is maintained, but the device complexity increases due to additional sensing units and control circuits
Solution Approach 1:
The patent applies universality by designing the sensing unit and control circuitry to perform multiple functions. The sensing unit not only measures OLED degradation but also characterizes transistor parameters (threshold voltage, mobility). The timing controller integrates compensation for both OLED aging and transistor variations in a single unified system, reducing overall device complexity despite the multiple compensation functions.
Solution Approach 2:
The patent implements self-service through automatic sensing and compensation mechanisms that operate without external intervention. The sensing unit automatically detects degradation and transistor parameter variations, and the timing controller autonomously generates compensated data signals based on stored compensation values, eliminating the need for manual calibration or adjustment.
3Manufacturing precision
If sensing and compensation circuits are added, then image quality consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing transistor parameter measurement and OLED characterization during the manufacturing process. The sensing unit measures threshold voltage and mobility of drive transistors, and OLED degradation characteristics are captured before final assembly. These preliminary measurements are stored as compensation values, enabling quality consistency without adding complex manufacturing steps during operation.
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 maintains uniform luminance and image quality by compensating for diode degradation and transistor variations, ensuring consistent display performance despite organic light emitting diode degradation and transistor mobility changes.
Implementation Method 1
the organic light emitting display makes use of organic light emitting diodes that emit light by re-combination of electrons and holes
Data Source
AI summary
An organic light emitting display capable of displaying images of uniform luminance and a method for driving the display are disclosed. The display senses degradation of the organic light emitting diode and threshold and/or mobility of a drive transistor and modifies the data supplied to the pixel according to the sensed parameters.