Display Device Lightguide Curing Shaded Resin
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Solution Overview
Problem
In display devices, such as smartphones and tablets, the ultraviolet curable resin used to bond the display panel with the cover member often expands beyond the active display area, leading to incomplete curing due to the light-shielding layer blocking ultraviolet light, which makes it difficult to restrict the resin filling area to only the display area.
Innovation Solution
A display device design incorporating a photosensitive resin layer with a first portion covering the entire display area and a second portion extending under the light-shielding area, combined with a lightguide member positioned under the light-shielding area to transmit curing light to the resin, ensuring complete curing of the resin even in shaded areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultraviolet curable resin is applied to bond the display panel with the cover member, then bonding strength is improved, but the resin may not be cured completely in portions under the light-shielding layer
Solution Approach 1:
The resin filling area is divided into two distinct regions: a first filling area within the active area that receives direct ultraviolet light for curing, and a second filling area within the peripheral area under the light-shielding layer that is guided light for curing. This segmentation allows different curing mechanisms to be applied to different regions, ensuring complete curing throughout.
Solution Approach 2:
A light guide member is introduced as an intermediary component to transfer ultraviolet light from the light source to the resin in the second filling area. The light guide member conducts the ultraviolet light through its internal structure and emits it at a predetermined position to cure the resin that cannot be reached by direct light due to the light-shielding layer.
2Area of stationary object
If the resin filling area is expanded to the peripheral area under the light-shielding layer, then bonding coverage is improved, but the resin cannot be cured due to light blockage
Solution Approach 1:
The curing approach transitions from a single-dimensional direct illumination method to a multi-dimensional approach by introducing lateral light guidance through the light guide member. This allows ultraviolet light to reach the resin in the peripheral area from the side, bypassing the light-shielding layer's blockage.
Solution Approach 2:
The light guide member serves as a mediator that bridges the gap between the ultraviolet light source and the resin in the peripheral area. It transports the curing light through its structure and delivers it to the resin at the appropriate location, enabling curing in previously inaccessible regions.
3Productivity
If ultraviolet light is radiated perpendicularly to the flat surface of the cover member, then curing efficiency in the active area is improved, but light cannot reach the resin under the light-shielding layer
Solution Approach 1:
The curing process is segmented into two parallel pathways: direct perpendicular irradiation for the first filling area in the active area, and guided lateral irradiation through the light guide member for the second filling area in the peripheral area. This segmentation enables both high curing efficiency and complete coverage.
Solution Approach 2:
The ultraviolet light source serves multiple functions: it provides direct perpendicular irradiation for efficient curing in the active area, and simultaneously guides light through the light guide member to cure the resin in the peripheral area under the light-shielding layer, achieving both efficiency and completeness.
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 effectively cures the photosensitive resin layer across the entire display device, including areas under the light-shielding portion, enhancing the bonding between the display module and the cover member and improving the display device's structural integrity and performance.
Implementation Method 1
a lightguide member which is provided under the light-shielding area so as to face the second portion of the photosensitive resin layer, and transmits light having a wavelength for curing the photosensitive resin layer therethrough
Implementation Method 2
an ultraviolet curable resin is applied to one of them. This one is overlapped with the other one. After the resin expands to the necessary filling area, the resin is irradiated with ultraviolet light perpendicularly to the flat surface of the cover member of the display device, thus curing the resin.
Data Source
AI summary
According to one embodiment, there is provided a display device including a display module and a cover member, bonded together by a photosensitive resin layer. A portion of the photosensitive resin layer that is located behind a light-shielding portion (in other words, located in a shaded portion) with respect to the light for curing the photosensitive resin is cured.