Display Device Current Source Switching for LED Defect Compensation
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Solution Overview
Problem
Display devices, regardless of active matrix or LED controllers, often experience malfunctions leading to defects, making it challenging to improve reliability without significantly increasing device costs.
Innovation Solution
A display device configuration with primary and backup light-emitting diodes and controllers, where each controller has a current source that can switch to drive a backup LED when a primary LED is damaged, ensuring continuous operation and brightness compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backup light-emitting diodes and controllers are added to enable defect compensation, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a multi-functionality principle by enabling current sources to serve dual purposes: driving primary light-emitting diodes during normal operation and driving backup light-emitting diodes when defects occur. The first current source can drive either the first light-emitting diode or the second light-emitting diode, and similarly the second current source can drive either the second light-emitting diode or the third light-emitting diode. This universal design allows the same hardware components to perform multiple functions, improving reliability through defect compensation capability while avoiding the need for completely separate backup hardware systems, thus controlling device complexity.
2Reliability
If defect compensation functionality is implemented, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies universality by designing current sources that can universally drive multiple light-emitting diodes (both primary and backup). This eliminates the need for separate dedicated backup current sources, reducing component count and manufacturing cost while still providing defect compensation functionality.
Solution Approach 2:
The patent merges the functionality of primary and backup light-emitting diode driving into shared current sources. By combining the control logic and hardware resources, the system achieves defect compensation capability without proportionally increasing manufacturing costs. The controllers integrate both primary and backup LED driving functions, and current sources are shared between primary and backup LEDs, reducing overall system cost.
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 configuration enhances the reliability of display devices by allowing seamless compensation for defects in primary LEDs or controllers, reducing the need for additional components and maintaining performance without substantial cost increases.
Implementation Method 1
a first light-emitting diode, a first controller, a second light-emitting diode, and a second controller. The first controller has a first current source, wherein the first current source is coupled in series to the first light-emitting diode
Data Source
AI summary
A display device and a driving method thereof are provided. The display device includes a first light-emitting diode, a first controller, a second light-emitting diode, and a second controller. The first controller has a first current source. The second controller has a second current source, wherein the first current source is coupled to a coupling point of the second light-emitting diode and the second current source. When the first light-emitting diode is normal, the first current source provides a first driving current to drive the first light-emitting diode. When the first light-emitting diode is open, the first current source stops providing the first driving current, and the second current source provides a second driving current to drive the second light-emitting diode.