Laser-Release Adhesive Layer for Micro-LED Defect Repair
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Solution Overview
Problem
Micro-LED display panels face issues with poor luminescence due to defective micro-LEDs, leading to suboptimal display effects, as existing technologies lack effective methods for identifying and repairing defective LEDs within the display substrate.
Innovation Solution
A display substrate with an adhesive layer whose adhesion decreases under laser irradiation is used, allowing for the identification and removal of defective micro-LEDs, followed by replacement with new ones, ensuring all LEDs emit light normally and improving the display panel's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If traditional adhesive layers are used to fix micro-LEDs, then the LEDs are firmly attached to the substrate, but defective LEDs cannot be removed or replaced
Solution Approach 1:
The adhesive layer transitions from a static, permanently strong bond to a dynamic system where adhesion strength can be changed on demand. By incorporating photodegradable bonds that break under specific light wavelengths, the adhesive becomes dynamically adjustable: strongly adherent during normal operation but easily removable when exposed to activation light, enabling selective replacement of defective LEDs.
Solution Approach 2:
The adhesive layer's key parameter (adhesion strength) is made changeable through light exposure. The photodegradable chemical bonds in the adhesive respond to specific light wavelengths by breaking down, causing the adhesion strength to decrease from a high initial value to a low removable state. This parameter change enables the adhesive to serve dual functions: strong bonding during operation and easy removal for repair.
2Reliability
If all micro-LEDs are tested before final assembly, then defective LEDs can be identified, but the process is time-consuming and reduces productivity
Solution Approach 1:
The adhesive layer is pre-configured with photodegradable bonds before LED assembly, creating a built-in mechanism for future selective removal. This preliminary design allows defective LEDs to be removed on-demand after identification, eliminating the need for time-consuming manual desoldering or adhesive removal processes during repair, thus maintaining high productivity while enabling reliability verification.
Solution Approach 2:
Light acts as an intermediary that triggers the removal process. By using light activation rather than mechanical or chemical methods, the system enables non-contact, rapid, and precise removal of defective LEDs without damaging surrounding components. This intermediary mechanism speeds up the repair process while ensuring reliable identification and replacement of defective units.
3Ease of operation
If manual methods are used to remove defective micro-LEDs, then precise control is possible, but the process is complex and time-consuming
Solution Approach 1:
The mechanical removal process (manual picking, heating, or chemical etching) is replaced with a light-based system. By exposing the adhesive layer to specific light wavelengths, the photodegradable bonds break automatically, causing the adhesive to release its grip on the LED. This substitution eliminates complex mechanical operations, reduces time loss, and simplifies the replacement process to a simple light exposure step followed by easy LED removal.
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 method ensures that each micro-LED in the display substrate operates correctly, enhancing the display panel's effectiveness and maintaining a good display effect by allowing for the identification and repair of defective LEDs within the substrate.
Implementation Method 1
the adhesive layer is an adhesive layer whose adhesion decreases under irradiation by a laser
Data Source
AI summary
Provided is a display substrate. The display substrate includes: an adhesive layer disposed on a side of the substrate, wherein the adhesive layer includes a plurality of adhesive blocks arranged in an array; and a plurality of light-emitting diode groups disposed on a side, away from the substrate, of the adhesive layer, wherein each of the plurality of light-emitting diode groups includes at least one light-emitting diode, and the plurality of light-emitting diode groups are in one-to-one correspondence with the plurality of adhesive blocks; wherein the adhesive layer is an adhesive layer whose adhesion decreases under irradiation by a laser.