Micro-Display Pixel Circuit for LED Defect Isolation Testing
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Solution Overview
Problem
The existing light-up test for silicon-based micro display devices is complex and costly, making it difficult to distinguish between defects in pixel driving circuits and light-emitting devices.
Innovation Solution
A display device with a display panel and driver configuration that includes light-emitting units with a light-emitting element, data writing unit, driving unit, and turn-on control unit, utilizing sub-voltage signals to control electrical connection and disconnection between the voltage line and light-emitting element for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing light-up test method is used to detect light-emitting device defects, then the detection can be performed, but the test process becomes complex and costly due to the need for driving current and complex pixel driving circuits
Solution Approach 1:
The patent extracts the detection function from the complex light-up test system by introducing a dedicated detection electrode that directly contacts the light-emitting element. This allows defect detection through electrical connection without requiring the full pixel driving circuitry, thereby simplifying the test fixture while maintaining detection capability.
Solution Approach 2:
The patent introduces a detection electrode as an intermediary element between the test system and the light-emitting element. This intermediary provides a direct electrical path for defect detection, eliminating the need for complex driving signals and circuits while enabling simple and effective testing.
2Measurement precision
If the existing light-up test method is used, then light-emitting element defects can be detected, but it is difficult to distinguish whether the issue is caused by pixel driving circuits or light-emitting devices
Solution Approach 1:
The patent segments the testing process into independent detection and driving functions. The detection electrode provides a separate, dedicated path for defect detection that is independent of the pixel driving circuits. This segmentation allows clear distinction between light-emitting element defects and circuit issues, as the detection path bypasses the complex driving circuitry.
Solution Approach 2:
The detection electrode enables the light-emitting element to be tested independently of the driving circuits. By providing a direct electrical connection for detection, the system allows the light-emitting element to self-identify its operational status without requiring the driving circuits to be functional, thus simplifying fault isolation.
3Measurement precision
If driving current is used to test light-emitting elements, then light emission can be observed, but the test process becomes more complex and costly
Solution Approach 1:
The detection electrode serves as an intermediary that enables light emission detection without requiring driving current. By providing a direct electrical connection, it allows the observation of light emission properties through a simplified setup, reducing the need for expensive and complex driving circuitry while maintaining detection accuracy.
Data Source
AI summary
A light-emitting unit in a display panel includes a light-emitting element, a data writing unit configured to write a data signal in a first stage, a driving unit connected to the light-emitting element and the data writing unit, and a turn-on control unit connected between the light-emitting element and a first voltage line. The driving unit is configured to generate a driving current based on the data signal in the first stage to drive the light-emitting element to emit light, and no driving current generated by the driving unit drives the light-emitting element to emit light in a second stage. The first voltage line is configured to transmit a first sub-voltage signal and a second sub-voltage signal in the first stage and the second stage respectively, thereby causing the electrical disconnection and electrical connection between the first voltage line and the light-emitting element respectively.