OLED Display Sensing Unit for Transistor Deterioration Compensation
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Solution Overview
Problem
Organic light emitting display devices face issues with displaying uniform images due to transistor deterioration and voltage drop, which affect the quality of the displayed image.
Innovation Solution
The device includes a sensing unit that extracts voltage drop information and deterioration information of the driving transistor through feedback lines, allowing for data compensation to maintain image quality by using a controller to adjust the data based on the extracted information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the organic light emitting display device operates continuously, then the display function is maintained, but transistor deterioration occurs causing image non-uniformity
Solution Approach 1:
The patent implements a feedback mechanism where the sensing unit continuously monitors the voltage at the first electrode of the driving transistor and feeds this information back to the controller. The controller then adjusts the data signal to compensate for transistor deterioration, allowing the display to maintain image uniformity over extended operating periods despite continuous degradation of the transistor characteristics.
2Ease of manufacture
If the display device is designed with simple structure, then manufacturing is easier, but compensation for transistor deterioration and voltage drop cannot be achieved
Solution Approach 1:
The patent introduces a sensing unit as an intermediary component that measures the voltage at the first electrode of the driving transistor. This sensing unit acts as a mediator between the driving transistor and the controller, providing real-time information about transistor state and power source voltage, enabling the controller to compensate for both transistor deterioration and voltage drop through data signal adjustment.
3Reliability
If feedback lines are added to extract voltage drop information, then image uniformity is improved, but device complexity increases
Solution Approach 1:
The sensing unit is designed to perform multiple functions: it senses the voltage at the first electrode of the driving transistor, extracts both voltage drop information and transistor deterioration information, and provides this data to the controller for compensation. This multi-functional design reduces the need for separate sensing circuits for different parameters, thereby limiting the increase in device complexity while achieving comprehensive compensation.
4Manufacturing precision
If the sensing unit extracts deterioration information continuously, then image quality is maintained, but power consumption increases
Solution Approach 1:
The sensing unit extracts voltage drop information continuously to maintain image uniformity, but transistor deterioration information is extracted periodically at predetermined intervals rather than continuously. This periodic extraction approach reduces the power consumption associated with continuous monitoring while still maintaining adequate image quality by updating compensation parameters at appropriate intervals.
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
This solution ensures that the organic light emitting display device can maintain image uniformity by compensating for transistor deterioration and voltage drops, thereby improving the overall display quality.
Implementation Method 1
an organic light emitting display device displays an image by using an organic light emitting diode which emits light by utilizing the recombination of electrons and holes
Data Source
AI summary
An organic light emitting display device includes pixels divided by scan lines and data lines, and including first transistors for controlling the amount of current flowing from a first power source to a second power source through organic light emitting diodes, first feedback lines and second feedback lines formed in parallel to the data lines, control lines formed in parallel to the scan lines, and a sensing unit configured to extract at least one of voltage drop of the first power source and deterioration information of the first transistor from the pixels via the first feedback lines and the second feedback lines.