Laser Transfer Plate Layout for Uniform Micro-LED Pressing
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Solution Overview
Problem
The laser transfer method for micro LEDs suffers from the issue of laser beams irradiating unintended areas on the target substrate, causing temperature increases and damage, which affects the accuracy and uniformity of the pressing force during the transfer process.
Innovation Solution
A device is designed with a reflective member and light absorbing member within a light transmitting plate to redirect and absorb laser beams away from unintended areas, ensuring precise application on micro-LEDs and improving the uniformity of pressing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam is used to transfer micro LED from relay substrate to target substrate, then the micro LED can be transferred to the target substrate, but the laser beam also passes through areas between micro LED and outer areas of the relay substrate, irradiating the target substrate and causing temperature increase and damage
Solution Approach 1:
The light transmitting plate is divided into multiple regions with different optical properties: a first region that transmits laser light to the micro LED, and a second region that reflects laser light away from the target substrate. This segmentation allows selective laser transmission only to the intended micro LED area while blocking stray laser beams from damaging other regions of the target substrate.
Solution Approach 2:
The light transmitting plate acts as an intermediary component between the laser source and the target substrate. It selectively transmits laser light to the micro LED while reflecting stray laser beams, thereby mediating the laser-substrate interaction to prevent harmful effects on the target substrate.
2Productivity
If laser beam is applied to transfer micro LED, then transfer process can be completed, but uniformity of pressing force is compromised due to laser irradiation of surrounding areas
Solution Approach 1:
The light transmitting plate is segmented into a first region for laser transmission and a second region for laser reflection. This segmentation ensures that laser energy is concentrated only on the micro LED area, preventing thermal interference with the pressing process in surrounding areas and maintaining uniform pressing force distribution across the target substrate.
3Ease of manufacture
If laser beam irradiates surrounding areas during micro LED transfer, then transfer process can proceed, but manufacturing defects occur on the target substrate
Solution Approach 1:
The light transmitting plate is divided into functional regions: a first region that transmits laser light to enable micro LED transfer, and a second region that reflects laser light to prevent damage to the target substrate. This segmentation maintains the simplicity of the laser transfer process while eliminating manufacturing defects caused by stray laser irradiation.
Solution Approach 2:
The light transmitting plate converts the potentially harmful stray laser beams into beneficial reflected light by using its reflective second region. Instead of allowing laser beams to damage the target substrate, the reflective region redirects them away, transforming a harmful effect into a protective function.
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 solution prevents manufacturing defects on the target substrate and enhances manufacturing efficiency by accurately applying laser beams to micro-LEDs while maintaining uniform pressing force.
Implementation Method 1
a reflective member disposed within the light transmitting plate and configured to reflect laser light incident a surrounding area other than the micro LED
Implementation Method 2
a light absorbing member configured to absorb laser light reflected by the reflective member
Implementation Method 3
a laser emission portion disposed on a front side of the light transmitting plate and configured to irradiate the display substrate with laser light through the light transmitting plate
Data Source
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AI summary
A device for manufacturing a display panel includes a support portion (200) on which a display substrate (20) is mounted. The device includes a light transmitting plate (310) disposed on a front surface of the support portion (200), a reflective member (330) disposed within the light transmitting plate (310), and a light absorbing member (340) configured to absorb laser light reflected by the reflective member (330). The device includes a pressing portion (300) configured to move the light transmitting plate (310) toward the display substrate (20) in association with pressing a plurality of light emitting elements (LE) arranged on the display substrate (20) with the light transmitting plate (310). The device includes a laser emission portion (500) disposed on a front side of the light transmitting plate (310) and configured to irradiate the display substrate (20) with laser light through the light transmitting plate (310).