Organic Light Emitting Display Panel Array Test Unit
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Solution Overview
Problem
Conventional organic light emitting display apparatuses face manufacturing difficulties and reliability issues due to high-density integrated circuits connected using the TAB method, leading to increased costs and defects in pixel-array substrates, which are challenging to test effectively.
Innovation Solution
An organic light emitting display panel with an array test unit and wiring test unit that includes demultiplexers and switches to apply test signals and detect defects in pixels and wirings, allowing for early defect detection and repair during the manufacturing process, thereby improving yield and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TAB method is used to connect high-density integrated circuits, then connection between driving circuits and pixel-array substrates is achieved, but manufacturing difficulty increases and reliability deteriorates
Solution Approach 1:
The patent extracts the test function from the final product structure and implements it as a separate array test unit that operates during manufacturing. This allows testing to be performed on the pixel array before final assembly, eliminating the need for complex post-assembly testing and improving both reliability and manufacturability.
Solution Approach 2:
The patent performs array testing at an early stage in the manufacturing process, before the pixel-array substrate is fully assembled with driving circuits. This preliminary testing enables defect detection and repair early in production, improving reliability while simplifying manufacturing by avoiding complex rework later.
2Reliability
If TAB method is used for connection, then driving circuits can be connected to pixel-array substrates, but manufacturing costs increase
Solution Approach 1:
The patent extracts the test functionality into a separate array test unit that operates independently during manufacturing. This enables early defect detection before final assembly, reducing waste and rework costs while maintaining connection reliability.
Solution Approach 2:
By performing array testing early in the manufacturing process before final assembly, the patent enables defect detection and repair at a lower cost stage, reducing overall manufacturing costs while ensuring connection reliability through proper testing.
3Reliability
If COG or SOP technologies are used to eliminate additional connection processes, then reliability and yields increase, but array testing in the panel becomes difficult
Solution Approach 1:
The patent segments the testing function into a dedicated array test unit that is integrated into the pixel-array substrate. This separate test unit can be activated independently to perform array testing without interfering with the COG or SOP connection structure, thus maintaining reliability while enabling testing.
Solution Approach 2:
The array test unit enables preliminary testing of the pixel array before final assembly with driving circuits. This early testing capability resolves the contradiction by allowing array testing to be performed at an stage when access is easier, while the final COG or SOP assembly maintains product reliability.
Data Source
AI summary
Provided is an organic light emitting display panel. The organic light emitting display panel includes a pixel unit including a plurality of pixels I displaying mutually different colors, a plurality of data pads electrically connected to wirings extending from the data lines, each of the plurality of data pads being connected to corresponding data lines, respectively, and an array test unit applying an array test signal to the plurality of pixels of the pixel unit, and sensing a current outputted from the plurality of pixels. The array test unit includes an array test pad electrically connected to a plurality of data pads through a plurality of array test switches.