Display Device with Integrated Drive Circuit and Reflective Light Shielding
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Solution Overview
Problem
Existing display devices using LEDs face issues with complex manufacturing processes, high defect rates, and reduced image contrast due to light leakage between pixels, particularly in structures with upper and lower electrode type LEDs and lack of obstacles between LEDs.
Innovation Solution
A display device configuration featuring light emitting units with integrated drive circuits and nonvolatile memory for controlled current supply, where each light emitting unit has a first and second surface for electrode connection, and a reflective material separates the units to prevent light leakage, simplifying the connection process and enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a self-light-emitting element (LED) is provided for each pixel to reduce power consumption, then energy efficiency is improved, but manufacturing complexity increases and defect rates rise due to the need for precise flip chip bonding and electrode alignment
Solution Approach 1:
The patent segments the LED structure into functionally independent components: the light-emitting chip is separated from the drive circuit, with only necessary electrodes (anode or cathode) directly bonded to the drive circuit. The other electrode is left unconnected or connected through a common electrode structure, simplifying the bonding process and reducing manufacturing complexity while maintaining energy efficiency benefits
Solution Approach 2:
The patent extracts the light-emitting function from the complete LED structure by using only one electrode connection. The unnecessary electrode connection is removed, allowing for simpler flip chip bonding processes and reducing alignment requirements, thereby decreasing manufacturing complexity and defect rates while preserving the self-light-emitting energy efficiency advantage
2Productivity
If LEDs are arranged in a matrix without obstacles between them to increase pixel density, then productivity is improved, but image contrast deteriorates due to light leakage between adjacent pixels
Solution Approach 1:
The patent introduces a light-shielding film as an intermediary element positioned between adjacent LED pixels. This film acts as a mediator that blocks light leakage from one pixel to another without significantly impacting the overall pixel density. The light-shielding film is strategically placed to prevent contrast deterioration while maintaining high productivity through efficient space utilization
3Reliability
If both electrodes of an LED are connected to drive circuits through flip chip bonding to ensure proper operation, then reliability is improved, but manufacturing complexity and defect rates increase due to alignment difficulty
Solution Approach 1:
The patent extracts the unnecessary electrode connection from the LED structure. Instead of connecting both electrodes through flip chip bonding, only one electrode (anode or cathode) is connected to the drive circuit. The other electrode is left unconnected or connected through a common electrode, significantly simplifying the bonding process and improving ease of manufacture while maintaining sufficient LED operation reliability
Solution Approach 2:
The patent inverts the conventional approach by connecting only one electrode instead of both electrodes. This inversion of the bonding strategy reduces alignment requirements and simplifies the flip chip bonding process, making manufacturing easier while still ensuring proper LED operation through the single electrode connection
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 configuration reduces manufacturing steps, increases yield, and improves image contrast by preventing light leakage between pixels, resulting in a more efficient and reliable display device.
Implementation Method 1
a reflective material separates the units to prevent light leakage
Data Source
AI summary
To enable manufacturing of a display device with a low defect rate and high yield, an integrated circuit chip includes a drive circuit that drives a light emitting unit, and the drive circuit includes a P-side electrode connected to an anode of the light emitting unit and a nonvolatile memory transistor that controls current supply to the P-side electrode.