Display Element Alignment Using AC Electric Field and Light Timing
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Solution Overview
Problem
Current display device manufacturing methods face challenges in achieving high alignment accuracy of light emitting elements, which is crucial for efficient and reliable display performance.
Innovation Solution
An apparatus and method involving a stage with electric-field-applying modules, light-irradiating modules, and signal control units to align light emitting elements by generating specific alignment signals and emission timing signals, utilizing ultraviolet or blue light to stimulate active layers and create a dielectrophoretic force for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used, then the manufacturing process is simple, but the alignment accuracy of light emitting elements is insufficient
Solution Approach 1:
The patent replaces conventional mechanical alignment methods with a dielectrophoretic alignment system. Light emitting elements are aligned using dielectrophoretic force generated by applying AC signals to alignment electrodes, rather than mechanical positioning. This substitution enables precise alignment (improving manufacturing precision) while using electrical fields instead of complex mechanical adjustment mechanisms.
Solution Approach 2:
The patent utilizes parameter changes in the electrical signals applied to alignment electrodes. By adjusting the frequency, amplitude, and phase of AC signals, the dielectrophoretic force is optimized to achieve precise alignment of light emitting elements. The alignment accuracy is controlled by changing electrical parameters rather than mechanical dimensions, resolving the contradiction between precision and device complexity.
2Manufacturing precision
If alignment signals are applied continuously, then alignment accuracy is maintained, but energy consumption increases
Solution Approach 1:
The patent applies periodic AC signals to alignment electrodes rather than continuous DC signals. The AC signals are applied in specific time periods during the manufacturing process, creating dielectrophoretic force only when needed for alignment. This periodic application maintains alignment accuracy while significantly reducing energy consumption compared to continuous signal application.
Solution Approach 2:
The patent applies alignment signals in advance during the manufacturing process, specifically during the period when light emitting elements are being positioned. By performing the alignment action preliminarily and at the appropriate time, the system achieves accurate alignment without requiring continuous energy input, thus reducing overall energy consumption while maintaining precision.
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
The approach significantly enhances the alignment accuracy of light emitting elements, improving the overall performance and reliability of display devices by ensuring precise placement of semiconductor layers.
Implementation Method 1
utilizing ultraviolet or blue light to stimulate active layers and create a dielectrophoretic force for precise alignment
Implementation Method 2
aligning the light emitting elements by forming an electric field by applying a first alignment voltage to the first alignment line and applying a second alignment voltage to the second alignment line
Data Source
AI summary
An apparatus for manufacturing a display device, comprising a stage, a first electric-field-applying module on a first side of the stage, and including first probe pins, a first light-irradiating module above the stage, and configured to irradiate light to the stage, a first light emission driver configured to transmit a first emission driving signal to the first light-irradiating module, and a signal output unit configured to output a first emission timing signal for setting light irradiation timing of the first light-irradiating module to the first light emission driver, to output a first alignment signal to any one of the first probe pins, and to output a second alignment signal to another one of the first probe pins, wherein the first emission timing signal and the second alignment signal are alternating current (AC) signals, and wherein periods of the first emission timing signal and the second alignment signal are the same.