Inkjet Head Nozzle Alignment for Uniform Sub-Pixel Luminance
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Solution Overview
Problem
In inkjet head devices, the random positioning of light emitting devices on a substrate results in varying numbers of devices per sub-pixel, leading to non-uniform luminance and reduced alignment, which affects the quality of display devices.
Innovation Solution
An inkjet head device with a body containing a nozzle and a first guide part to align light emitting devices in a line, utilizing dielectrophoretic forces to ensure consistent placement and alignment between electrodes on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting devices are dropped randomly on substrate in units of droplets, then the manufacturing process is simple, but the number of light emitting devices per sub-pixel varies and luminance uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-aligning light emitting devices in a linear configuration within the inkjet head before droplet ejection. The guide part positions devices in a predetermined linear arrangement, ensuring that when droplets are deposited on the substrate, the devices are already oriented correctly. This preliminary alignment eliminates the need for post-deposition alignment processes while guaranteeing uniform luminance across all sub-pixels.
2Device complexity
If light emitting devices are positioned randomly in droplets, then the device structure is simple, but the alignment degree of light emitting devices is reduced
Solution Approach 1:
The patent introduces a guide part as an intermediary component within the inkjet head. This guide part acts as a mediator that temporarily holds and aligns light emitting devices in a linear configuration before they are transferred to the substrate. The guide part facilitates proper orientation during the transfer process, ensuring high alignment degree upon deposition without requiring complex alignment mechanisms on the substrate itself.
3Manufacturing precision
If the same number of light emitting devices are provided in each sub-pixel, then luminance uniformity is improved, but it becomes difficult to maintain consistent device count
Solution Approach 1:
The patent applies preliminary action by pre-configuring the inkjet head with a guide part that holds a predetermined number of light emitting devices in a linear arrangement. This pre-configuration ensures that each droplet ejected contains the exact same number of aligned devices, automatically guaranteeing uniform luminance across all sub-pixels without requiring complex control mechanisms during the deposition process.
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 solution ensures a uniform number of light emitting devices per sub-pixel, improving luminance and alignment, resulting in enhanced display quality.
Implementation Method 1
a first guide part disposed in the body to guide the light emitting devices to the nozzle in a line
Data Source
AI summary
An inkjet head device comprises a body comprising light emitting devices, a nozzle installed on a lower side of the body to spray the light emitting devices onto the substrate in units of droplets, and a first guide part disposed in the body to guide the light emitting devices to the nozzle in a line. Since the light emitting devices arranged in a line by the first guide part are dropped on the substrate in units of a predetermined amount of droplets, the number of light emitting devices included in each droplet may be the same or similar. Thus, since the same or similar number of light-emitting elements are disposed or aligned in each sub-pixel, the luminance in each sub-pixel obtained by the light-emitting elements can be uniform.