Display Device Detector Assembly with Light-Blocking Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with optical sensors or fingerprint sensors between a front panel and a display panel experience issues with pressure-induced breakage and bubble formation in the optically elastic resin layer, leading to impaired display quality and measurement accuracy due to light diffusion and external light interference.
Innovation Solution
A display device configuration featuring a measurement region with a detector and flexible print circuits, where the optically elastic resin layer is avoided in the area between the measurement region and the front panel, and a light-blocking layer is used to prevent external light from entering the detector, ensuring accurate measurements and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a component is disposed on the optically elastic resin layer, then the component can be protected from breakage, but the bonding becomes insufficient and bubbles are generated
Solution Approach 1:
A support structure is introduced as an intermediary element between the component and the optically elastic resin layer. This support structure distributes the pressure during bonding process, preventing direct pressure on the component while ensuring adequate bonding in the area under the component, thereby eliminating bubbles without compromising component protection.
Solution Approach 2:
The bonding area is segmented into different zones: an first area under the component where bonding is performed with support, and a second area where the component is disposed on the resin layer. This segmentation allows different bonding conditions to be applied in different regions, ensuring both component protection and bonding quality.
2Ease of manufacture
If the component is embedded in the optically elastic resin layer, then smooth filling is achieved, but bubbles are caused and display quality is impaired
Solution Approach 1:
The component is extracted from the optically elastic resin layer and placed on its surface instead. The support structure takes the place of embedding the component within the resin, allowing smooth resin filling without the component obstructing the flow, while preventing bubble formation by maintaining component separation from the resin.
3Reliability
If optically elastic resin is provided between the detector and the display panel, then bonding is achieved, but external light enters the detector making correct measurement difficult
Solution Approach 1:
The optically elastic resin layer is designed with different properties in different areas: in the first area it provides bonding function, while in the second area where the component is disposed, the resin is configured to minimize light transmission to the detector. This local differentiation allows bonding to be maintained while preventing external light interference with the detector.
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 configuration prevents pressure-induced damage, reduces bubble formation, and enhances measurement accuracy by minimizing external light interference, thereby improving the overall display quality and reliability of the device.
Implementation Method 1
If an air layer exists between the surface of the display panel of the display module and the front panel, reflection of light occurs at the interface between the front panel (a glass plate, for example) and the air layer having different refractive indices
Implementation Method 2
a component placed in the first space, the component including a detector configured to detect a physical property of the measurement region in the first space
Data Source
AI summary
A display device includes: a display panel including a display region where a user image is displayed and a measurement region; a transparent front panel disposed on a front side of the display panel; a bonding layer provided between the display panel and the front panel to avoid a first space and cover the display region, and bonding the display panel and the front panel together; and a component placed in the first space, the component including a detector configured to detect a physical property of the measurement region in the first space and flexible print circuits with the detector mounted thereon, and the flexible print circuits extending from the first space to an outside of an interspace between the display panel and the front panel.