OLED Display Current Protection via Image-Based Reference Voltage
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Solution Overview
Problem
Active matrix OLED displays face challenges in protecting the device from abnormal currents due to defects in pixels, which can lead to unprotected display failure, as the current control methods are technically difficult and expensive.
Innovation Solution
A display device with a current detector and controller that compares the total current flowing through pixels with a reference voltage signal, generated based on image information, to control the power voltage supplier, stopping the power supply when the current exceeds a limiting value, thereby protecting the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active matrix OLED display uses conventional current control methods, then device protection is achieved, but control complexity and cost increase
Solution Approach 1:
The system uses the display device's own image information and pixel structure to generate the reference voltage signal, eliminating the need for external complex protection circuits. The existing pixels and power voltage supplier are utilized to create a self-monitoring system that automatically detects abnormal currents and triggers protection.
Solution Approach 2:
The power voltage supplier serves multiple functions: it supplies power to the pixels during normal operation and acts as a protection mechanism when abnormal currents are detected. The controller also generates both the driving signals for pixels and the reference voltage signal for current monitoring, reducing the need for separate dedicated protection components.
2Reliability
If active matrix OLED display uses conventional current control methods, then device protection is achieved, but manufacturing cost increases
Solution Approach 1:
The system uses the display device's own image information and pixel structure to generate the reference voltage signal, eliminating the need for external complex protection circuits. The existing pixels and power voltage supplier are utilized to create a self-monitoring system that automatically detects abnormal currents and triggers protection.
Solution Approach 2:
The power voltage supplier serves multiple functions: it supplies power to the pixels during normal operation and acts as a protection mechanism when abnormal currents are detected. The controller also generates both the driving signals for pixels and the reference voltage signal for current monitoring, reducing the need for separate dedicated protection components.
3Device complexity
If pixel has defect or fault, abnormal current flows, then display device protection fails, but simple current monitoring is needed
Solution Approach 1:
The system continuously monitors the total current flowing through the pixels and compares it with a dynamically generated reference voltage signal. When the monitored current exceeds the reference, the controller immediately stops the power voltage supplier, creating a closed-loop feedback protection system that responds to abnormal conditions in real-time.
Solution Approach 2:
The reference voltage signal is dynamically adjusted based on the image information being displayed. Different images require different total currents, so the reference signal changes accordingly. This allows the system to distinguish between normal current variations due to image content and abnormal currents caused by pixel defects.
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 effectively limits abnormal currents, ensures the stability of the display device, and allows for easy detection of defective pixels by controlling power voltage supply based on image information, improving safety and operational efficiency.
Implementation Method 1
a current detector configured to detect a total current flowing in the plurality of pixels
Implementation Method 2
The current detector may include a current-voltage converter configured to convert the total current into a first voltage
Implementation Method 3
An organic light emitting diode display among flat panel displays uses an organic light emitting diode, which generates light by recoupling electrons and holes to display an image
Data Source
AI summary
Provided is a display device, including: a display unit including a plurality of pixels that emit light according to a plurality of data signals supplied through a plurality of data lines; a power voltage supplier configured to supply a power voltage to the plurality of pixels; a current detector configured to detect a total current flowing in the plurality of pixels; and a controller configured to receive image information of one frame unit and generate a reference voltage signal corresponding to the image information of one frame unit. The current detector compares the total current and the reference voltage signal and controls driving of the power voltage supplier according to the comparison.