Wire Grid Polarizing Layer for Touch Display Integration
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Solution Overview
Problem
The existing touch display devices have increased fabrication costs and thickness due to separate formation of touch panels and display panels, complicated fabrication processes, reduced optical efficiency, and decreased image brightness due to absorption-type polarizing plates.
Innovation Solution
A touch display device with a wire grid polarizing layer formed on the inner surface of a substrate, functioning as both a touch electrode and an in-cell polarizing plate, which simplifies the fabrication process, reduces costs, and enhances optical efficiency and image brightness by recycling reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch panel and display panel are formed separately, then touch sensitivity is maintained, but fabrication cost increases and device thickness increases
Solution Approach 1:
The patent combines the touch panel and display panel into a single integrated structure. The wire grid polarizing layer is formed on the same substrate as the liquid crystal layer, eliminating the need for separate touch panel and display panel assemblies. This integration reduces fabrication costs while maintaining touch sensitivity through the conductive wire grid structure.
Solution Approach 2:
The wire grid polarizing layer serves multiple functions simultaneously: it acts as a polarizing element for the liquid crystal display and as a conductive touch sensing electrode. This multi-functionality eliminates the need for separate touch electrode layers and polarizing plates, reducing overall device complexity and fabrication cost while preserving touch sensitivity.
2Reliability
If separate touch panel and display panel are formed, then touch function is ensured, but device thickness increases
Solution Approach 1:
The patent merges the touch panel and display panel into a single integrated structure where the wire grid polarizing layer is formed on the same substrate as the liquid crystal layer. This integration eliminates the need for separate touch panel and display panel assemblies, thereby reducing overall device thickness while maintaining full touch functionality.
3Ease of manufacture
If absorption type polarizing plates are used, then polarization function is achieved, but optical efficiency is reduced and image brightness decreases
Solution Approach 1:
The patent replaces the traditional absorption-type polarizing plate with a wire grid polarizing structure. The wire grid reflects one polarization component and transmits the other, rather than absorbing light. This substitution significantly improves optical efficiency and image brightness while maintaining the polarization function necessary for liquid crystal display operation.
4Ease of manufacture
If wire grid polarizing layer is integrated into display structure, then fabrication process is simplified and cost is reduced, but structural complexity increases
Solution Approach 1:
The patent integrates the wire grid polarizing layer into the display structure by forming it on the same substrate as the liquid crystal layer. This merging of functions into a single integrated structure actually simplifies the fabrication process by reducing the number of separate manufacturing steps and assemblies, while the regular patterned wire grid structure keeps the design manageable.
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
The solution improves touch sensitivity, reduces fabrication costs, and increases image brightness by integrating the polarizing function into the display device's structure, while maintaining a thinner form factor.
Implementation Method 1
a wire grid polarizing layer on the color filter layer, the wire grid polarizing layer including a plurality of bars
Implementation Method 2
recycling reflected light
Implementation Method 3
An electric field is generated between the pixel electrode 32 and the common electrode 34 according to an application of a voltage, and a liquid crystal molecule of the liquid crystal layer 50 is realigned by the electric field to display a gray level
Data Source
AI summary
A touch display device including: first and second substrates facing and spaced apart from each other, the first and second substrates including red, green and blue sub-pixels; a polarizing layer on an outer surface of the first substrate; a pixel electrode and a common electrode in each of the red, green and blue sub-pixels on an inner surface of the first substrate; a color filter layer on an inner surface of the second substrate; a wire grid polarizing layer on the color filter layer, the wire grid polarizing layer including a plurality of bars, and a touch signal applied to the wire grid polarizing layer; a liquid crystal layer between the first and second substrates; and a backlight unit under the first substrate.