Adaptive Overcurrent Protection for OLED Display Devices
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Solution Overview
Problem
Existing OLED display devices face damage due to overcurrent issues, particularly in screen save mode where the overcurrent protection circuit fails to operate effectively due to low current levels, leading to potential degradation of organic light emitting diodes.
Innovation Solution
A display device with an adaptive overcurrent protection circuit that adjusts its current threshold based on a scale factor, which is reduced during screen save mode to prevent overcurrent damage, and returns to normal mode upon detection of overcurrent, ensuring the OLED display is protected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the predetermined current value of the overcurrent protection circuit is set higher than the maximum current that can flow to the display panel, then the display device can operate normally without false shutdown, but the overcurrent protection circuit cannot sufficiently protect the OLED display from overcurrent damage
Solution Approach 1:
The patent applies dynamics by making the predetermined current value changeable rather than fixed. The overcurrent protection circuit dynamically adjusts the current threshold based on the operating mode (normal mode vs. screen save mode) to match the actual current levels, enabling effective protection in both scenarios without false shutdowns
Solution Approach 2:
The patent changes the parameter of the predetermined current value based on the scale factor. When the scale factor is less than 1 (screen save mode), the current threshold is reduced proportionally, allowing the protection circuit to detect overcurrent conditions that occur at lower current levels during screen save operation
2Adaptability or versatility
If the overcurrent protection circuit uses a fixed predetermined current value, then the circuit structure remains simple, but the circuit cannot adapt to different operating modes (normal mode and screen save mode) where current levels differ significantly
Solution Approach 1:
The patent implements feedback by using the scale factor (which reflects the operating mode) to adjust the predetermined current value. The overcurrent protection circuit receives the scale factor information and automatically adjusts its threshold accordingly, creating a closed-loop adaptive protection mechanism
Solution Approach 2:
The patent makes the overcurrent protection circuit universal by enabling it to function effectively in both normal mode and screen save mode through the scalable current threshold mechanism, allowing a single circuit design to handle multiple operating conditions
Data Source
AI summary
A display device includes: a screen saver operable to cause an image to be displayed with a lowered luminance in a screen save mode by lowering a scale factor from a first value based on the image being displayed as a still image longer than a reference time; and an overcurrent protection circuit operable to detect an overcurrent and cause a power of the display device to be turned off based on a predetermined current value that is reduced according to the scale factor and comparison between the predetermined current value and a driving current supplied provided to a display panel in which the image is displayed.