Alternating Redundancy LED Driving in Light Emitting Displays
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Solution Overview
Problem
Light emitting display devices face issues with pixel defects due to poor contact between LEDs and thin film transistor array substrates during manufacturing, leading to defective pixels and increased costs from redundant LEDs that are not utilized when no defects occur.
Innovation Solution
A light emitting display device with a new structure that alternately drives both main and redundancy LEDs, even when no defects are present, to improve reliability and reduce costs by utilizing both LEDs effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy LED is configured to operate only when main LED is defective, then cost is reduced, but reliability is worsened because redundancy LED is not used when no defect occurs
Solution Approach 1:
The patent applies periodic action by alternately driving the main LED and redundancy LED in different time periods (frames). The main LED is driven in odd frames while redundancy LED is driven in even frames, allowing both LEDs to be utilized over time. This periodic switching resolves the contradiction by ensuring reliability through LED usage while managing costs through shared driving resources.
Solution Approach 2:
The patent implements dynamics by making the driving state of LEDs changeable over time rather than fixed. The system dynamically switches between main LED and redundancy LED based on frame timing, allowing the configuration to adapt between reliability-focused operation and cost-efficient resource sharing without requiring permanent dedicated circuits for each LED.
2Reliability
If both main LED and redundancy LED are driven simultaneously, then reliability is improved, but device complexity increases due to additional driving circuits
Solution Approach 1:
The patent applies universality by making the driving circuit serve multiple functions: it can drive either the main LED or the redundancy LED depending on the frame timing. The same driving circuit resources are reused for both LEDs across different time periods, eliminating the need for separate dedicated driving circuits for each LED and thus reducing device complexity while maintaining reliability.
3Reliability
If redundancy LED is always driven, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent uses periodic action to control energy consumption by driving LEDs alternately in different frames rather than continuously. The main LED consumes energy in odd frames while redundancy LED consumes energy in even frames, ensuring that at any given moment only one LED is active. This periodic switching maintains reliability through LED availability while significantly reducing overall energy consumption compared to continuous dual LED operation.
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 enhances the lifespan and driving efficiency of the display device, reduces recognition of defective pixels, and improves user experience by preventing diagonal lines and making the screen appear full.
Implementation Method 1
a first LED disposed in the unit pixel and a second LED disposed in the unit pixel and emitting light of the same color as the first LED
Data Source
AI summary
A light emitting display device according to an embodiment of the present disclosure includes a display panel including a unit pixel, a first LED disposed in the unit pixel, and a second LED disposed in the unit pixel and emitting light of the same color as the first LED. When the first LED and the second LED are able to emit light normally, the first LED and the second LED alternately emit light.