OLED Pixel Circuit Repair via Segmented Light Blocking Layer
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Solution Overview
Problem
In organic light emitting display devices, the light blocking layer covers the pixel circuit unit, making it difficult to locate and repair defective pixels, and the removal process often results in a secondary short circuit between the light blocking layer and the metal layer of a transistor.
Innovation Solution
Incorporating a repair part within the light blocking layer that is specifically designed to be open in areas where pixel defects occur, allowing for targeted repair without causing a short circuit, and ensuring the light blocking layer does not overlap with the lines to be repaired.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light blocking layer covers the entire pixel circuit unit, then light input to transistors is prevented, but repair area detection becomes difficult and secondary short circuits occur during repair
Solution Approach 1:
The light blocking layer is segmented into different regions: a first light blocking layer covering the transistor area to prevent light from affecting transistor operation, and a second light blocking layer with a window portion that exposes the line area to enable repair area detection and laser repair access
Solution Approach 2:
Different regions of the light blocking layer have different light blocking properties: the first light blocking layer has high light blocking capability to protect transistors, while the second light blocking layer has a window portion with reduced light blocking to allow detection and repair of defective lines
2Object-affected harmful factors
If the light blocking layer covers the entire pixel circuit unit, then light input to transistors is prevented, but secondary short circuits occur between light blocking layer and metal layer during repair
Solution Approach 1:
The light blocking layer is divided into a first light blocking layer positioned away from the line and a second light blocking layer positioned near the line, with the second layer having a window portion that prevents direct contact between the light blocking layer and metal layer during repair, thereby avoiding secondary short circuits
Solution Approach 2:
The window portion in the second light blocking layer acts as an intermediary structure that maintains the light blocking function while creating physical separation between the light blocking layer and the metal layer, preventing direct contact and secondary short circuits during laser repair
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
Facilitates easy detection and repair of pixel defects while preventing secondary short circuits, enhancing the yield rate and quality of the organic light emitting display devices by allowing for precise intervention in the repair process.
Implementation Method 1
The organic light emitting diode OLED emits light with a data current Ioled supplied from the driving transistor DT
Implementation Method 2
when removing the light blocking layer 20 (which is formed in the repair area) with the laser to perform the repair process
Data Source
AI summary
Provided are an organic light emitting display device and a method of manufacturing the same. The organic light emitting display device includes: an emission unit including an organic light emitting diode, a pixel circuit unit including: a circuit configured to drive the emission unit, and a line configured to apply a signal to the circuit, and a light blocking layer covering the pixel circuit unit, and configured to block light input to the pixel circuit unit, and a repair part disposed in the light blocking layer, the repair part being configured for repairing the line when a defect occurs in a pixel that includes the pixel circuit unit.