AMOLED Print Head Circuit for Simpler Module Manufacturing
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Solution Overview
Problem
Existing LED print heads require complex manufacturing processes such as wafer dicing and die bonding, which complicate the production of light-emitting modules.
Innovation Solution
An OLED print head is manufactured using an active-matrix organic light-emitting diode (AMOLED) process, where light-emitting units with thin film transistors and driving circuits are directly formed on a substrate, reducing manufacturing steps and incorporating capacitors to stabilize voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wafer dicing and die bonding processes are used to manufacture LED print heads, then light-emitting modules can be manufactured, but the manufacturing process becomes complicated and production efficiency decreases
Solution Approach 1:
The patent integrates the light-emitting module manufacturing directly onto the print head substrate using OLED technology, eliminating the need for separate wafer dicing and die bonding processes. The light-emitting elements are formed in-situ on the substrate, merging multiple manufacturing steps into a single integrated process that simplifies production and improves efficiency
Solution Approach 2:
The patent replaces mechanical assembly processes (wafer dicing, die bonding) with a direct deposition and formation process where light-emitting materials are deposited and patterns are formed directly on the substrate. This substitution of mechanical assembly with material deposition eliminates complex manufacturing steps
2Reliability
If capacitors are added to store correction voltage and enable voltage, then voltage stability improves and element protection is enhanced, but device complexity increases
Solution Approach 1:
The patent incorporates capacitors that pre-store correction voltage and enable voltage before they are needed. This preliminary charging of capacitors during non-active periods allows rapid voltage application when needed, improving response time and stability without requiring complex real-time voltage regulation circuits
Solution Approach 2:
The capacitors in the circuit serve dual functions: they store voltage for stability and also protect other elements from voltage fluctuations. This self-service capability reduces the need for additional protection circuits, balancing reliability improvement with minimal complexity increase
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 approach allows for faster response times, prolonged service life, and improved control over light emission, reducing the risk of element damage and enhancing manufacturing efficiency.
Implementation Method 1
An OLED (organic light-emitting diode) is coupled to the first switch and the second switch. When both the first switch and the second switch are turned on, the OLED obtains a driving current related to the correction voltage through the driving path.
Implementation Method 2
The first driving circuit includes a first capacitor and a first switch, and is configured to store a correction voltage corresponding to the correction signal in the first capacitor
Data Source
AI summary
An OLED print head includes a control unit, multiple light-emitting units and an OLED. Each light-emitting unit includes a first driving circuit and a second driving circuit. The first driving circuit includes a first capacitor and a first switch, and is configured to store a correction voltage corresponding to a correction signal in the first capacitor in response to a trigger pulse of a scan signal, and the first switch is controlled by the correction voltage. The second driving circuit includes a second capacitor and a second switch, and is configured to store an enable voltage corresponding to an enable signal in the second capacitor in response to the trigger pulse of the scan signal, and the second switch is controlled by the enable voltage. When both the first switch and the second switch are turned on, the OLED obtains a driving current related to the correction voltage.