Borderless Touch Display Using Fresnel Lens Integration
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Solution Overview
Problem
Conventional touch-sensing display devices face challenges in achieving a borderless appearance without increasing the overall thickness, as the lens layer and conductive lines obstruct the display area and influence touch-sensing functionality.
Innovation Solution
The touch-sensing display device integrates a Fresnel lens structure into the touch-sensing module, with conductive portions and sensing conductive strips on a substrate, allowing for a borderless appearance without additional thickness by positioning the touch-sensing module between the display module and a casing, and using resistance portions to differentiate sensing conductive strip voltages for accurate touch coordinate calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a lens layer with Fresnel lens structure is disposed in the liquid crystal panel to achieve borderless appearance, then the display area is increased and frame is concealed, but the overall thickness of the device is increased
Solution Approach 1:
The patent merges the lens layer with the touch-sensing module into a single integrated structure. The lens layer is formed as part of the touch-sensing module assembly rather than being a separate component, which allows the borderless display effect to be achieved without adding extra thickness to the overall device structure.
Solution Approach 2:
The integrated structure serves multiple functions simultaneously: the lens layer provides both the optical magnification effect for borderless display and the touch-sensing functionality. By combining these functions into one component, the patent eliminates the need for separate layers that would increase thickness.
2Reliability
If conductive lines are disposed at the edge of conductive films for touch sensing, then touch detection is enabled, but the display area is reduced due to concealment by conductive lines
Solution Approach 1:
The patent positions the conductive lines asymmetrically along the edges of the touch-sensing module rather than distributing them uniformly across the entire display area. This asymmetric placement minimizes the visual impact on the display area while maintaining touch detection functionality at the necessary locations.
Solution Approach 2:
The conductive lines are localized to specific edge regions where touch detection is required, rather than being distributed across the entire display surface. This local placement strategy maintains touch sensing reliability at critical areas while preserving the majority of the display area for visual content.
3Area of stationary object
If lens layer is disposed outside the touch-sensing module as add-on, then borderless appearance is achieved, but the overall thickness is increased and touch sensitivity is influenced
Solution Approach 1:
The lens layer is integrated into the touch-sensing module structure rather than being disposed as a separate add-on component. This merging of components simplifies the overall device structure, reduces the number of assembly steps, and eliminates the need for additional bonding materials while achieving the borderless display effect.
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 design enhances the available display area and maintains a borderless appearance while maintaining the touch-sensing functionality without increasing the device's thickness, addressing market demands for thinner, borderless touch-sensing mobile devices.
Implementation Method 1
a lens layer with a Fresnel lens structure is conventionally disposed in the liquid crystal panel. In this way, the lens layer can magnify the images from the liquid crystal panel
Implementation Method 2
When a medium such as finger or pen touches the touch-sensing module 40, the conductive films 51, 61 of the touch-sensing module 40 will contact each other causing a voltage drop due to short circuit. The upper conductive line 52 detects the voltage of the lower conductive film 61 at the touch point via the upper conductive film 51
Data Source
AI summary
A touch-sensing display device, specifically to a borderless touch-sensing display device, is disclosed. The touch-sensing display device includes a display module and a touch-sensing module. The touch-sensing module includes a first sensing sheet and a second sensing sheet, wherein a space exists between the first sensing sheet and the second sensing sheet. The first sensing sheet includes a lens layer, a plurality of first conductive portions, and a conductive film, wherein the conductive film is disposed on the lens layer while the first conductive portions are distributed on two opposite sides of the lens layer. The second sensing sheet includes a substrate, a plurality of second conductive portions, and a plurality of conductive strips, wherein the second conductive portions are selectively distributed on one of two sides of the substrate while the conductive strips are respectively connected to the second conductive portions and have different voltages.