Display Brightness Control for LED Sealing Integrity
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Solution Overview
Problem
Conventional techniques fail to prevent damage to LED elements due to detachments between the LED element and the bonding wire caused by expansion of the epoxy sealing material when sudden heat is applied upon power activation after a long period of inactivity.
Innovation Solution
A display system and method that gradually applies heat and illuminates the LED element upon power activation, calculating a brightness setting sequence based on humidity absorption to prevent vaporization expansion and minimize damage, using a humidity storage device with a humidity sensor and count-up timer to determine the optimal brightness sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the LED element is activated immediately after a long period of inactivity, then the device can be used without delay, but the sealing material expands due to sudden heat causing detachments between the LED element and bonding wire
Solution Approach 1:
The system performs preliminary actions by monitoring humidity levels during the off-state and pre-calculating the appropriate brightness ramp-up sequence before activation. This allows the device to transition smoothly from off to full operation without sudden thermal shock, preventing sealing material expansion while maintaining high availability.
Solution Approach 2:
The brightness setting sequence is made dynamic and adaptive based on monitored humidity levels. Instead of a fixed immediate activation or fixed gradual ramp-up, the system adjusts the brightness progression rate according to the actual humidity state, optimizing both reliability and productivity for each specific condition.
2Reliability
If the brightness is increased gradually to prevent sealing material expansion, then LED element damage is reduced, but the device activation time is extended
Solution Approach 1:
The system changes the brightness parameter dynamically during activation based on monitored humidity levels. By adjusting the brightness progression rate according to actual environmental conditions, the system achieves the minimum necessary activation time while still preventing sealing material expansion and LED element damage.
Solution Approach 2:
The system uses feedback from humidity monitoring to control the brightness ramp-up process. The brightness increase rate is continuously adjusted based on real-time humidity data, allowing the fastest possible activation that still prevents damage, thereby minimizing activation time while maintaining reliability.
3Device complexity
If conventional sealing materials are used without humidity monitoring, then the device structure is simple, but moisture absorption causes expansion and detachment damage
Solution Approach 1:
The system employs self-service by using the LED display device itself to monitor its own environmental conditions through integrated humidity sensors. The device monitors its own operating environment and automatically adjusts its activation sequence, eliminating the need for external monitoring equipment while improving bonding integrity.
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 approach lowers the likelihood of damage to LED elements during power activation after a long period of inactivity by gradually increasing brightness, thereby preventing vaporization expansion and detachments.
Implementation Method 1
a brightness calculation device that calculates a brightness setting sequence based on a humidity amount over a first period in which the display device is in the power-off state
Implementation Method 2
the epoxy or silicone resin material of the sealing material 57 absorbs humidity (moisture 58)
Implementation Method 3
detachments which have occurred at joined surfaces as a result of expansion (vaporization expansion) of the epoxy material of the sealing material 57, which can arise in cases where heat is suddenly applied upon power activation
Implementation Method 4
an LED element 5 is formed by integrating a red LED element 5R, a green LED element 5G, and a blue LED element 5B
Data Source
AI summary
A display system includes: a display device that transits from a power-off state to a power-on state; and a brightness calculation device that calculates a brightness setting sequence based on a humidity amount over a first period in which the display device is in the power-off state, the brightness setting sequence being a sequence of a setting value of a brightness of the display device during a second period, the second period starting from when the display device transits to the power-on state, the setting value changing in time series. The display device displays an image signal at a brightness according to the brightness setting sequence.