Microdisplay Redundancy Repair for Faulty Pixel Drivers
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Solution Overview
Problem
Conventional microdisplays face reliability issues due to damage in light-emitting driver elements and embedded pixel memory, leading to malfunction and reduced image quality or device failure, which are not adequately addressed by existing technologies.
Innovation Solution
A display apparatus with embedded pixel memory and light-emitting driving circuits incorporates a redundancy repair mechanism, utilizing nonvolatile memory to store and retrieve repair data and control the display of pixel units, and redundant pixel driving circuits to replace faulty components, ensuring image quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microdisplay design without redundancy is used, then device complexity is low, but reliability deteriorates due to damage in light-emitting driver elements and embedded pixel memory
Solution Approach 1:
The patent applies preliminary action by pre-configuring redundant pixel driving circuits and embedded memory units before any failure occurs. The system proactively prepares backup components that can be activated when failures are detected, rather than reacting to failures after they compromise display reliability.
Solution Approach 2:
The patent implements beforehand cushioning by incorporating redundant pixel driving circuits and memory units as protective buffers against component failures. These redundant components serve as a safety cushion that prevents single-point failures from degrading display reliability, allowing the system to tolerate certain failures while maintaining operational integrity.
2Reliability
If redundant pixel driving circuits and embedded memory are added, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the redundant pixel driving circuits and embedded memory units to serve multiple functions: they act as backup components for reliability, but also function as operational display elements when activated. This multi-functionality reduces the net increase in device complexity since the redundant components are not entirely idle but can contribute to display output.
Solution Approach 2:
The patent merges the redundant components with the primary display structure, integrating them into the same pixel array and driving architecture. Rather than adding completely separate backup systems, the redundant elements are combined with the primary functional elements, sharing common control logic and physical space, thereby minimizing the increase in overall device complexity.
3Productivity
If redundancy repair mechanism is implemented, then production yield is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action in manufacturing by pre-configuring the redundant components and establishing the repair mechanism during the manufacturing process. This allows defects to be compensated for after manufacturing, thereby enhancing production yield by enabling defective displays to be repaired and sold rather than being discarded.
4Stability of the object's composition
If dynamic replacement of faulty components is performed, then image quality stability is maintained, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the redundant components and establishing the repair mechanism during the manufacturing process. This allows defects to be compensated for after manufacturing, thereby enhancing production yield by enabling defective displays to be repaired and sold rather than being discarded.
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
The redundancy repair mechanism enhances production yield and ensures stable image output by dynamically replacing faulty sub-pixel driving circuits and memory bits, maintaining display integrity and reducing power consumption.
Implementation Method 1
a nonvolatile memory; and a drive control circuit configured to control the display module to execute a pixel unit redundancy repair procedure for obtaining and storing repair data in the nonvolatile memory
Implementation Method 2
a pixel circuit coupled to the drive repair circuit, including Q corresponding light-emitting diodes (LEDs)
Data Source
AI summary
This invention provides a display apparatus with redundancy repair capability, comprising: a display module including a plurality of display pixel units arranged in M columns and P rows and at least one redundant pixel driving circuit; a nonvolatile memory; and a drive control circuit. The drive control circuit is configured to control the display module to execute a pixel unit redundancy repair procedure, thereby identifying defective pixel units and storing corresponding repair data into the nonvolatile memory. Additionally, during a display procedure, the drive control circuit retrieves the repair data from the nonvolatile memory and controls the plurality of display pixel units and to activate the at least one redundant pixel driving circuit to bypass faulty units, ensuring accurate image displaying based on the repair data and display data.