Organic Light Emitting Display Panel Driver Current Control
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Solution Overview
Problem
Organic light emitting display devices face issues with overcurrent flow due to the data addressing method, which can lead to power supplier shutdown and reliability concerns, as they struggle to manage current levels effectively between preceding and current frames.
Innovation Solution
An apparatus and method that predict panel current values based on data from both frames and control data voltage to ensure the current remains below a preset limit, using a panel driver that divides frames into sub-frames and adjusts voltage levels to prevent overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the data addressing method updates data of a current frame in data of a preceding frame displayed on the display panel, then the image can be displayed continuously, but an overcurrent momentarily flows in the display panel during partial addressing period
Solution Approach 1:
The patent applies preliminary action by predicting the panel current value before actually displaying the current frame data. The controller calculates the expected current based on both preceding and current frame data, and adjusts the data voltage in advance to prevent overcurrent. This is evident in the steps where the controller predicts current values and determines adjusted data voltages before the actual display update occurs.
Solution Approach 2:
The patent changes the parameter of data voltage to control the panel current. When the predicted current exceeds the threshold, the controller adjusts the data voltage applied to the display panel, thereby changing the electrical parameter to keep the current within safe limits while still maintaining continuous image display.
2Illumination intensity
If the current value flowing in the display panel is increased to display bright images, then the image brightness is improved, but the current exceeds the maximum allowable current value causing power supplier shutdown
Solution Approach 1:
The patent implements feedback by continuously monitoring the panel current value and using this information to adjust subsequent data voltages. The controller predicts current based on display data and feedback from current measurements, then adjusts the data voltage accordingly to maintain both image quality and current safety. This creates a closed-loop control system that balances brightness and reliability.
Solution Approach 2:
The patent makes the data voltage dynamic rather than static. The controller adjusts the data voltage in real-time based on the predicted panel current and the difference between current and maximum allowable current. This dynamic adjustment allows the system to optimize image brightness while preventing overcurrent conditions that would cause shutdown.
3Manufacturing precision
If the data voltage is increased to improve display quality, then the image quality is enhanced, but the panel current exceeds the current limit value
Solution Approach 1:
The patent changes the data voltage parameter dynamically based on display content analysis. By predicting the panel current from display data and comparing it with the current limit, the controller adjusts the data voltage to achieve optimal display quality without exceeding current limits. This parameter adjustment maintains image quality while preventing harmful overcurrent conditions.
Data Source
AI summary
Disclosed is an apparatus and method for driving an organic light emitting display device which controls a current flowing in a display panel to be lower than a current limit value, the apparatus comprising a display panel including a plurality of pixels, wherein each pixel is provided with a light emitting device which emits light according to a current corresponding to a data voltage; and a panel driver that predicts a panel current value flowing in the display panel on the basis of data of a preceding frame and data of a current frame simultaneously displayed on the display panel, and controls the data voltage to be displayed on the display panel so as to make the panel current value be lower than a preset current limit value.