Touch Screen Eliminating Bridging for High Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch screen technologies face challenges with complex production processes, high production costs, and reduced yield due to the requirement of bridging structures in capacitive sensing, which also lead to electrostatic breakdown and display quality issues.
Innovation Solution
A touch screen structure that eliminates bridging by using a transparent substrate with successively formed patterned transparent electrically conductive layers and a patterned insulating layer, where one layer forms drive lines and the other induction lines, without the need for metal bridging, allowing for simpler production and improved transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal bridging structure is used to connect drive lines and induction lines, then the touch control function can be achieved, but the production process becomes complicated and quality control becomes difficult
Solution Approach 1:
The patent extracts and eliminates the metal bridging structure from the touch screen design. Instead of using metal bridges to connect drive lines and induction lines, the invention uses a patterned insulating layer with openings that allow direct formation of conductive lines without bridging, thereby simplifying the production process while maintaining touch control functionality
Solution Approach 2:
The patent segments the conductive lines into separate patterned layers (first patterned transparent electrically conductive layer and second patterned transparent electrically conductive layer) with the insulating layer in between. This segmentation eliminates the need for bridging connections while maintaining the electrical connectivity required for touch sensing
2Reliability
If metal bridging structure is used, then the touch control function can be achieved, but electrostatic breakdown occurs easily at bridging points
Solution Approach 1:
The patent removes the metal bridging structure that is prone to electrostatic breakdown. By using patterned transparent conductive layers with insulating separators, the invention eliminates the bridging points where electrostatic discharge would occur, thereby improving reliability against ESD while maintaining touch control function
3Reliability
If metal bridging structure is used, then the touch control function can be achieved, but whitening phenomenon occurs under illumination affecting transmittance
Solution Approach 1:
The patent extracts and removes the metal bridging structure that causes whitening under illumination. By replacing metal bridges with patterned transparent conductive layers and insulating layers, the invention eliminates the source of light scattering and whitening, thereby improving transmittance and display quality while maintaining touch control functionality
4Device complexity
If one sheet of glass is used for protection and touch control (OGS technique), then the structure becomes simpler and thinner, but the coating procedure for metal bridging becomes complicated
Solution Approach 1:
The patent removes the metal bridging coating procedure from the OGS structure. By using patterned insulating layers with openings that enable direct formation of conductive lines, the invention eliminates the complex metal bridging coating steps while maintaining the simplified OGS structure and thinness
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 reduces production costs, enhances yield, and improves anti-electrostatic breakdown ability and display quality by eliminating the need for bridging, resulting in a lighter, thinner, and more efficient touch screen with high transmittance.
Implementation Method 1
when a finger (or other object) approaches or touches the touch screen, it would influence the capacitance between a drive line and an induction line which intersect each other around a touch point. The position of the touch point can be identified by detecting a change in the capacitance between the drive line and the induction line.
Data Source
AI summary
The embodiments of the invention disclose a touch screen, a method for producing a touch screen, and a touch display device, which relate to a field of display. The touch screen does not need bridging, have high transmittance, and are simple in process, which can not only reduce the production cost but also achieve a high yield of mass production. The touch screen as provided in the embodiments of the invention comprises: a transparent substrate; a first patterned transparent eclectically conductive layer; a patterned insulating layer and a second patterned transparent eclectically conductive layer, which are formed above said transparent substrate successively, wherein among said first patterned transparent electrically conductive layer and said second patterned transparent electrically conductive layer, one is formed with a plurality of drive lines, and the other is formed with a plurality of induction lines; the pattern of said insulating layer is identical with that of said first patterned transparent electrically conductive layer, or identical with that of said second patterned transparent electrically conductive layer.