Reflective Layer Bonding Structure for Material-Flexible Displays
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Solution Overview
Problem
Existing display devices for head-mounted displays face limitations in the selection of materials for the bonding layer, which affects the performance and efficiency of the display.
Innovation Solution
The display device incorporates a bonding layer between the reflective layer and the planarization layer, allowing for the use of various materials such as titanium oxide, titanium nitride, ITO, organic, and inorganic layers, thereby minimizing material selection restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bonding layer is used to bond the reflective layer to the planarization layer, then the bonding strength is improved, but the selection of materials is restricted
Solution Approach 1:
The reflective layer is designed to serve dual functions: as a reflective electrode and as a bonding layer. By forming the reflective layer directly on the planarization layer, it inherently provides bonding functionality without requiring a separate bonding layer, thus expanding material selection while maintaining bonding strength
Solution Approach 2:
The bonding function is extracted from a separate bonding layer and integrated into the reflective layer itself. This eliminates the need for a distinct bonding layer with restricted material options, allowing the reflective layer to be formed from various materials such as ITO, IZO, or transparent conductive oxides that provide both reflectivity and bonding capability
2Productivity
If the first electrode area is increased to improve light emission, then the light emission efficiency is improved, but the overlapping area with the reflective layer increases causing electrical interference
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first electrode and the reflective layer. This insulating layer allows the first electrode to overlap the reflective layer for improved light emission while preventing direct electrical contact that would cause interference, thus resolving the contradiction between emission efficiency and electrical interference
Solution Approach 2:
The problem is solved by adding a vertical dimension through the insulating layer. Instead of limiting the horizontal area of the first electrode, the insulating layer provides vertical separation, allowing the electrode to extend in the horizontal plane for better light emission while maintaining electrical isolation through the vertical insulating barrier
Data Source
AI summary
A display device capable of minimizing restrictions on the selection of materials used in a bonding layer includes a substrate, a transistor disposed on the substrate, a planarization layer disposed on the transistor, a first electrode disposed on the planarization layer to be connected to the transistor, an intermediate layer disposed on the first electrode, a second electrode disposed on the intermediate layer, a reflective layer disposed in a trench of the planarization layer and separated from the first electrode and a bonding layer disposed between the inner wall of the trench and the reflective layer.