Semiconductor Light-Emitting Display With Flip-Flop Sub-Field Driving
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Solution Overview
Problem
Current active-matrix displays face challenges in accurately bonding semiconductor light-emitting elements to substrates and require micro-ICs, making defect inspection and repair difficult.
Innovation Solution
An active-matrix display device utilizing flip-flops without a separate micro-IC, employing a driving method that time-divides frames into sub-fields to control semiconductor light-emitting elements, allowing for high-speed operation and minimizing sleep time by asynchronous sub-field signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor light-emitting elements are physically bonded onto a substrate with micro-IC, then light emission function is achieved, but bonding accuracy and defect inspection become very difficult
Solution Approach 1:
The patent replaces physical bonding of semiconductor light-emitting elements with electrical connection through conductive adhesive. The circuit board contains replicated circuit patterns that electrically connect to the light-emitting elements without requiring precise physical bonding, thus solving the bonding accuracy problem while maintaining light emission function
Solution Approach 2:
The patent replaces the mechanical bonding system with an electrical connection system. Instead of physically bonding semiconductor elements to a substrate with micro-IC, the invention uses conductive adhesive to create electrical connections between circuit board traces and light-emitting element terminals, eliminating the need for precise mechanical positioning
2Extent of automation
If micro-IC is used in active-matrix display, then driving function is achieved, but defect inspection and repair become difficult
Solution Approach 1:
The patent extracts the micro-IC from the display structure and replaces it with a circuit board containing integrated circuit patterns. This allows the driving function to be maintained through electrical connections while enabling direct access to circuit traces for defect inspection and repair without disassembling bonded components
Solution Approach 2:
The circuit board contains replicated driving circuit patterns that replace the micro-IC functionality. These printed circuit traces can be easily inspected and repaired compared to integrated circuits, maintaining the automated driving function while improving accessibility for maintenance
3Reliability
If active-matrix driving method with capacitor is used, then display quality is maintained, but operation speed is limited
Solution Approach 1:
The patent removes the capacitor component from the active-matrix driving circuitry. By using a different driving approach with conductive adhesive-based electrical connections, the invention eliminates the need for capacitors that limited operation speed, thereby improving speed while maintaining display quality through alternative circuit design
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
Enables precise bonding and efficient defect inspection/repair of semiconductor light-emitting elements, achieving high-speed operation without the need for capacitors and micro-ICs, while maintaining display quality.
Implementation Method 1
light-emitting diodes (LEDs) are well known light-emitting elements for converting an electrical current to light
Data Source
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AI summary
A display device of the present invention comprises: a substrate; multiple semiconductor light-emitting elements formed on the substrate; flip-flops which apply an electrical signal to the semiconductor light-emitting elements to maintain the semiconductor light-emitting elements in a light-emitting state for a predetermined time interval; scan electrodes and data electrodes electrically connected to the flip-flops, respectively; and a driving unit, wherein, when a frame synchronization signal is generated during a time interval from a time point of the generation of a sub field signal to a time point of the generation of a subsequent sub field signal, the driving unit prevents voltage from being applied to the data electrodes for the time interval.