Cover Glass Integrated Sensor Light-Blocking Layer Linearity
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Solution Overview
Problem
Conventional cover glass integrated sensors with capacitance type film sensors suffer from poor linearity of the frame-like light-blocking layer, leading to a blurred display screen outline and air bubble issues due to level differences, which affect visibility and appearance unity.
Innovation Solution
A cover glass integrated sensor design featuring a second frame-like light-blocking layer made from an exposure/development product of color resist material, positioned closer to the center than the first frame-like light-blocking layer, improving linearity and reducing level differences, thereby enhancing visibility and appearance unity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a frame-like light-blocking layer is formed on the peripheral portions of the backside of the transparent glass substrate by screen printing with light-blocking ink, then the light-blocking effect is achieved, but the linearity along the inner edge becomes very poor causing the display screen outline to look blurred
Solution Approach 1:
The light-blocking structure is divided into two separate layers: the first frame-like light-blocking layer formed by screen printing on the glass substrate, and the second frame-like light-blocking layer formed by exposure and development of color resist material on the base sheet. This segmentation allows each layer to serve a specific function - the first layer provides structural light-blocking while the second layer ensures precise linearity for the display screen outline.
Solution Approach 2:
The second frame-like light-blocking layer is positioned closer to the center than the first layer, creating a local quality enhancement at the critical inner edge region. This inner edge portion of the second layer provides the sharp linearity needed for the display screen outline, while the outer portions are handled by the first layer.
2Reliability
If three layers of printing films are overprinted to obtain a light-blocking effect, then the light-blocking performance is improved, but a big level difference is generated between peripheral portions and central portion causing air bubbles to be likely generated
Solution Approach 1:
The patent merges the light-blocking function into a laminated structure where the first frame-like light-blocking layer on the glass substrate and the second frame-like light-blocking layer on the base sheet work together. This combination achieves the required light-blocking effect while distributing the material thickness more evenly, reducing the level difference that causes air bubbles.
Solution Approach 2:
The light-blocking structure uses composite materials - the first layer uses light-blocking ink on glass substrate while the second layer uses color resist material on the base sheet. This composite approach allows optimization of each material's properties and reduces the overall level difference compared to using three layers of the same printing film.
3Manufacturing precision
If the inner edge of the black mask is positioned nearer to the center than the inner edge of the frame-like light-blocking layer of the cover glass, then the display screen outline sharpness is improved, but there is a big difference in depth between the revealed portions of the black mask and the frame-like light-blocking layer causing portions surrounding the display screen to lack a sense of unity in appearance
Solution Approach 1:
The second frame-like light-blocking layer is nested within the boundary defined by the first frame-like light-blocking layer. The inner edge of the second layer is positioned closer to the center, providing sharp outline definition, while the first layer extends outward to maintain appearance unity. This nested arrangement allows both requirements to be satisfied simultaneously.
Data Source
AI summary
A cover glass integrated sensor has an excellent visibility of sharp outlines of the display screen as seen through the cover glass and has a sense of unity in appearance in portions surrounding the display screen. The cover glass integrated sensor includes a cover glass and a capacitance type film sensor. The cover glass includes a glass substrate and a first frame-like light-blocking layer made of a screen printing film formed on peripheral portion on the rear surface of the glass substrate. The capacitance type film sensor has a second frame-like light-blocking layer made of an exposure/development product of color resist material formed on a periphery of the front surface. The capacitance type film sensor is attached to a rear surface of the cover glass. An inner edge of the second frame-like light-blocking layer is closer to the center than an inner edge of the first frame-like light-blocking layer.